Radiometry (image visual consistency) for the five Counties of Study Area 2 (SA2) was accomplished primarily as a part of the exploitation imagery processing. The goals were to 1) develop imagery that retains the actual color balance, tone and clarity of the ground conditions as captured by the sensor, 2) develop contrast and sharpness properly so as not to introduce artifacts, 3) develop all imagery such that a visual consistency is obtained across all of SA2 and in conformance with imagery of adjacent SPM19 study areas SA1 (to the west) and SA3 (to the east), 4) perform initial exploitation imagery processing such that minimal imagery adjustment, dodging, etc. is necessary in the final orthoimagery product, and 5) perform the Orthoimagery processing steps such that no loss of quality or change in imagery radiometry or clarity is introduced relative to the initial exploitation image processing. In this regard, example target images were provided by CGIA and corresponding images were provided by Atlas for SA2 in March 2019 from initial imagery acquisition of 2019. Eight bit/3-band, RGB, uncompressed sample exploitation images from six-pack SA2 overlap areas with SA1 and SA3 were evaluated by the State from SA2 initial imagery acquisition relative to the previously provided target samples and SA1/SA3 imagery. Approval of the SA2 imagery was provided in a communication from CGIA in April 2019. The digital image processing involves using the UltraMap post processing software suite, Digital Image Analyst and GeoCue distributed processing software. After image acquisition, data is copied to a central network storage system. UltraMap project imagery data is exported for each day of acquisition. Data is then imported into an UltraMap module to provide a central location to organize and display the data for processing. The process generates images from a set of samples provided by the system, without histograms. Primary front-end post processing within the workflow develops look-up-tables (LUTs) to provide initial color, tone and contrast solutions for the raw post processed imagery. Software is used to create histograms for each image by using a series of tools to correct Gamma, Color Balance and Tone. Gamma is created based on image acquisition conditions. Grey samples are selected from images for evaluation to provide even color balance. Highlights and shadows are adjusted to create tonal curves. Histogram end points are set to eliminate possible clipping in order to ensure data integrity. GeoCue is used to process final image data in an efficient manner and still maintain data integrity for the final imagery. Each image also is subjected to a visual quality control examination as well as being run through a blur checking algorithm. This overall process is used to ensure consistent imagery and provide for stringent Quality Control measures for exploitation image processing.
Seamline polygons were auto-generated by UltraMap software and manually reviewed and edited for each individual orthorectified image to produce a seamless mosaic of ortho-rectified imagery. Interactive mosaic tools and methods were used primarily to initially create seamlines to develop seamless orthoimagery for Study Area-2 (SA2). Automatic seamline (mosaic polygon generation tools) were generally used throughout the Study Araea, irrespective of terrain type. Subsequently, seamlines and resulting mosaic polygons were visually edited to follow feature boundaries and manually digitized, reviewed and edited to provide the best and most complete mosaic result possible. All SA2 orthoimage tiles were full tiles, 5,000' x 5,000', with no void areas. All final orthoimage tiles were visually inspected for completeness, to eliminate gaps or void areas, radiometry issues, feature distortions, artifacts, linear feature displacements and image motion. Additional imagery QA/QC steps included visually checking edge match and accuracy to ensure compliance to the project scope of work and North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Atlas Geographic Data, Inc. and Axis Geospatial, LLC
Publication_Date: 20190114
Title: Flight and Control Plan: SPM19 SA2, Attachment C
Edition: 1.0
Geospatial_Data_Presentation_Form:
Microsoft Word DOC, Adobe PDF, Excel Spreadsheet, ESRI Shapefiles, Google kmz files, and Ultracam flight afl and apf files.
Publication_Information:
Publication_Place: Wilmington, NC
Publisher: Atlas Geographic Data, Inc.
Type_of_Source_Media: FTP, disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2019
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: FLGCPLN
Source_Contribution:
The Imagery Acquisition and Ground Control Plan, Attachment-C, approved by CGIA and NCDOT provided the source data, materials and technical plan to execute the ground control and imagery acquisition phases outlined in Task 1 under the SPM19 Scope of work.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Keystone Aerial Surveys, Inc., Axis Geospatial and Atlas Geographic Data, Inc.
Publication_Date: 20190426
Title:
Flight and Control Plan for Validation Range, Expedited Camera Report Ultracam Eagle 80 #00817310
Edition: 1.0
Geospatial_Data_Presentation_Form:
Microsoft Word DOC, Adobe PDF, Excel Spreadsheet, ESRI Shapefiles, Google kmz files, and Ultracam flight afl and apf files.
Publication_Information:
Publication_Place: Wilmington, NC
Publisher: Atlas Geographic Data Inc. for SPM19 SA2
Type_of_Source_Media: FTP, disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2019
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: NCVR
Source_Contribution:
Digital sensor Ultracam Eagle 80 #00817310 acquired imagery of the North Carolina Validation Range in Surry County, NC in February 2019. The Flight and Ground Control Plan Attachment C was completed in January 2019 with subsequent Reports prepared for the sensor being Expedited Camera Syatem report for Validation Range with KAS Sensor UCE-80 00817310 submitted and approved by NCDOT on 20190523 with an Advisory report. Sensor Ultracam Eagle 80 #00817310 was approved for use by CGIA and NCDOT.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Spatial Data Consultants, Keystone Aerial Surveys, Inc. and Atlas Geographic Data, inc.
Publication_Date: 20160205
Title:
Flight and Control Plan for Validation Range, Expedited Camera Report Ultracam Eagle 80 #50319383
Edition: 1.0
Geospatial_Data_Presentation_Form:
Microsoft Word DOC, Adobe PDF, Excel Spreadsheet, ESRI Shapefiles, Google kmz files, and Ultracam flight afl and apf files.
Publication_Information:
Publication_Place: Wilmington, NC
Publisher:
Spatial Data Consultants, Inc. with report used by Atlas Geographic Data Inc. for SPM19 SA2
Type_of_Source_Media: FTP, disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2016
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: NCVR
Source_Contribution:
Digital sensor Ultracam Eagle 80 #50319383 acquired imagery of the North Carolina Validation Range in Surry County, NC in January 2016. The Flight and Ground Control Plan Attachment C was completed in January 2016 with subsequent Reports prepared for the sensor being Imagery Acquisition Compliance Report Attachment D, Exploitation Image Post Processing, Airborne GPS-IMU Post Processing, Aero-Triangulation Report Attachment E submitted and approved by NCDOT on 20160205. An Expedited Camera Approval Advisory Report was submitted to Spatial Data Consultants, Inc. by NCDOT in February 2016 for sensor #50319383. Sensor Ultracam Eagle 80 #50319383 was approved for use by CGIA and NCDOT.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Atlas Geographic Data, Inc., Axis Geospatial LLC and Keystone Aerial Surveys, Inc.
Publication_Date: 2019
Title: Microsoft Ultracam Eagle 80 and 100 Digital Airborne Imagery
Edition: 1.0
Geospatial_Data_Presentation_Form: Raster TIFF, Adobe pdf, ASCII Text and Excel Spreadsheet
Publication_Information:
Publication_Place: Wilmington, NC and Easton, MD
Publisher:
Atlas Geographic Data Inc., Axis Geospatial LLC and Keystone Aerial Surveys, Inc.
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20190225
Single_Date/Time:
Calendar_Date: 20190403
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: DAIMGRY
Source_Contribution:
The raw exploitation digital airborne imagery acquired by Ultracam Eagle 80 and Eagle 100 digital sensors served as the foundation image component for SPM19 Study Area-2 (SA2) within the inner piedmont and mountain terrain of SA2. The raw imagery for SA5 was collected at a planned altitude of about 7554 feet Above Mean Terrain (AMT) for UCE 80 and 9514 feet for UCE 100 sensors using a 3-Dimensional terrain flight plan method to capture imagery at just less than a six inch pixel resolution and within NC DOT specified Ground Sample Distances (GSD) across each image in sixteen sorties utilizing a planned minimum 60% forward lap and 30% sidelap format. The 3-D design increased the sidelap and endlap significantly in the flight plan in order to maintain the specified GSD. The twelve (12) NC Ortho tiles over the City of Asheville were acquired by a UCE 100 using an imagery endlap of 80% and a flight line sidelap of 80% to acquire more nadir imagery for development of True Orthophotos of all buildings within the City. The imagery was collected in a proprietary RAW image format and post processed as a 4-band (RGB and CIR) color, 8-bit, uncompressed TIFF raster image file, tiled at 256 with averaged overviews. The final post processed 3-band 8-bit TIFF images were then utilized for the Aero-Triangulation, DEM update, Seamline generation and Orthoimagery rectification and production phases. The exploitation imagery acquisition was reported for SPM19 SA2 within one Imagery Acquisition Compliance Report. Attachment D report for AT Blocks 1 and 2 (True Ortho over Asheville) dated 20190425 and amended 20190515 . Attachment D report may be obtained from CGIA.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Atlas Geographic Data Inc., Axis Geospatial LLC, Keystone Aerial Surveys, Inc.
Publication_Date: 2019
Title: Airborne GPS and Inertial Measurement Unit (IMU) Data
Edition: 1.0
Geospatial_Data_Presentation_Form: Excel Spreadsheet, Adobe pdf and ASCII Text
Publication_Information:
Publication_Place: Wilmington, NC, Easton, MD and Philadelphia, PA
Publisher:
Atlas Geographic Data Inc., Axis Geospatial LLC and Keystone Aerial Surveys, Inc.
Type_of_Source_Media: disc and FTP
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20190225
Single_Date/Time:
Calendar_Date: 20190403
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: ABGPSIMU
Source_Contribution:
The Airborne GPS data provides accurate geodetic coordinates for the nadir point of each raw exploitation image at the precise time of exposure. The IMU data provides accurate omega, phi and kappa orientation angles representing the attitude of the sensor at the precise time of exposure for each image. The Airborne GPS coordinates and IMU orientation angle values play a key role in the accuracy of the Aero-Triangulation process by supplementing the field survey ground control, thus saturating the project study area with exploitation image control by providing preliminary pre-aero-triangulation coordinates and sensor attitude to each exploitation image. The Airborne GPS coordinates were expressed horizontally in NC SPC NAD83 (2011), US Survey Feet and vertically in NAVD 1988 (GEOID12A), US Survey Feet. The omega, phi and kappa IMU orientation angles were expressed in decimal degrees. The Airborne GPS and IMU data was reported for SPM19 SA2 within Airborne GPS_IMU Post Processing Reports Attachment E for AT Block 1 dated 20190516 that was final revised on 20190626 and for AT Block 2 dated 20190517.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Atlas Geographic Data Inc.
Publication_Date: 2019
Title:
Ground Control Data and Surveys Report Attachment C-1, SPM19 SA2 AT Blocks 1 and 2
Edition: 1.0
Geospatial_Data_Presentation_Form: Excel Spreadsheet, Adobe pdf, and pdf pictures
Publication_Information:
Publication_Place: Wilmington, NC
Publisher: Atlas Geographic Data Inc.
Type_of_Source_Media: disc and FTP
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20190328
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: GCSA2
Source_Contribution:
The Ground Control data provides precise NC State Plane geodetic coordinates and elevations for pre-paneled and photo-identifiable positions throughout SPM19 Study Area 2 (SA2). These control point positions were measured along with pass and tie points within the imagery during the relative orientation Aero-Triangulation (AT) measurement process. The precise ground control coordinate values along with the GPSIMU data were then applied in an absolute AT adjustment in order to accurately control and geo-reference each image within the AT blocks and to validate the control and check points used during the process. Within Study Area 2, one hundred thirty-four (134) new locations were GPS surveyed by OPUS and/or NC RTK procedures with a minimum 20 minute GPS observation (OPUS) and 3 to 4 minute observation (RTK) using CORS data from the NC Geodetic Survey (NCGS) network for differential correction. Twenty-seven (27) existing NCGS monuments were recovered and paneled and fifty-two (52) GPS surveyed points from the 2010 NC Statewide, NPM18 and SPM15 orthoimagery projects were field researched and recovered or replaced. These 2010, 2018 and 2015 prior orthoimagery project points were provided by NCGS and CGIA as excel spreadsheets with pdf pictures and location descriptions. This totaled 213 ground control points for all of SA2. Nearly one third of all ground control points were used as Checkpoints within the Aero-Triangulation adjustment of the two AT Blocks for SA2 to calculate residuals from the AT adjusted coordinates relative to known surveyed coordinates. Checkpoints were then merged into the final AT adjustments as Control. The Ground Control coordinates were expressed horizontally in NC State Plane Coordinates (NCSPC), North American Datum NAD83 (2011), US Survey Feet and vertically in NAVD 1988 (GEOID12A), US Survey Feet. Ground Control data and surveys were reported within Attachment C-1 Control Surveys Report for SPM19 SA2 dated 20190328 and approved by NCGS in Advisory report dated 20190501.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NC Department of Transportation
Publication_Date: 2019
Title: NCDOT Bridge Locations
Geospatial_Data_Presentation_Form: ESRI Shapefile
Publication_Information:
Publication_Place: Raleigh, NC
Publisher: NC Department of Transportation
Type_of_Source_Media: FTP
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20111205
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: BRIDGLOC
Source_Contribution:
The NCDOT Bridge Location shapefile was utilized during the Internal Level-1 Macro (IL1M) quality control review process to visit each bridge location in the orthoimagery within SPM19 Study Area-2 (SA2) to determine if special DEM treatment was required to remove distortion introduced to the bridge by being an elevated structure overpass or culvert relative to the ground level defined by the NC Floodplain Mapping LiDAR at each location.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NC Department of Transportation
Publication_Date: 2019
Title: NCDOT Construction History
Geospatial_Data_Presentation_Form: ESRI Shapefile
Publication_Information:
Publication_Place: Raleigh, NC
Publisher: NC Department of Transportation
Type_of_Source_Media: FTP
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20111122
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: CONHIST
Source_Contribution:
The NCDOT Construction History shapefile was utilized during the Internal Level-1 Macro (IL1M) quality control review process to visit each new roadway construction project in the orthoimagery within SPM19 Study Area-2 (SA2) to determine if special DEM treatment was required to update the Digital Elevation Model (DEM defined by the NC Floodplain Mapping LiDAR dataset.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Geospatial and Technology Management Office
Publication_Date: 2019
Title:
NC Floodplain Mapping Program (FMP) LIDAR digital elevation model
Edition: 1.0
Geospatial_Data_Presentation_Form: digital data
Publication_Information:
Publication_Place: Raleigh
Publisher: Geospatial and Technology Management Office
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2015
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: LIDAR DEM
Source_Contribution:
The LIDAR digital elevation data used for the rectification of the orthophotos was provided by the Geospatial and Technology Management Office.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Geospatial and Technology Management Office
Publication_Date: 2010
Title: Tile index
Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: None
Publisher: None
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2010
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: INDEX
Source_Contribution:
The tile definition is used to cut orthorectified imagery into manageable, usable images. Each tile is 5000' X 5000'.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NC Geodetic Survey
Publication_Date: 2019
Title: North Carolina County Boundaries
Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Raleigh
Publisher: NC Geodetic Survey
Type_of_Source_Media: digital download
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2019
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: CB
Source_Contribution:
The county boundaries are used to select tiles by county for packaging imagery for offline distribution.
Process_Step:
Process_Description:
North Carolina Validation Range. Four airborne acquisition systems, each comprised of a twin engine Cessna or Piper aircraft, Microsoft Ultracam Eagle 80 Digital Airborne Sensor (#50319383), Ultracam Eagle 100 (#80510607), Ultracam Eagle 80 (#00817310) and Ultracam Eagle 80 (#50617043) using Applanix POSAV-510 GPS-IMU systems and Track AIR flight management system software were verified and certified for use on the SPM19 SA2 project by acquiring digital airborne imagery, airborne GPS and IMU data over the North Carolina Validation Range in Surry County, NC. The Validation range covers an area of 20,000 ft by 20,000 ft. Atlas Geographic data, Inc., Axis Geospatial LLC (and SDC for sensor #50319383) processed each Validation Range mission as a mini project, delivering all products and reports required under the SPM19 scope of work and expedited reports. The Aero-Triangulation (AT) results and Orthoimage tiles for each Validation Range mini project were reviewed and verified by NCDOT and NCGS for compliance with the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014, and ASPRS Class I horizontal accuracy requirements. The processes and results for each acquisition system verified under the Validation Range procedure were reported and documented in Attachment D (imagery acquisition compliance), and Attachment E (ABGPS-IMU & aerotriangulation) Expedited Reports. The primary sensor validation process involved a direct comparison by NCDOT of coordinates for blind paneled and photo ID checkpoints (more than 34 checkpoints identified) from the aerotriangulation adjustment report (established using only four project corner paneled monuments) to the known coordinates as GPS surveyed by NC Geodetic Survey.
Source_Used_Citation_Abbreviation: NCVR
Process_Date: 20190225
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Imagery Acquisition Flight and Ground Control Planning. Atlas Geographic Data, Inc. (Atlas), and project team members Axis Geospatial, LLC, (Axis) and Keystone Aerial Surveys, Inc. (KAS) jointly planned and identified flight and control plans for SPM19 SA2 in compliance with the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014. Preliminary flight and control plans in the form of Attachment C were submitted to CGIA and NCDOT for approval prior to execution of SPM19 Project Task 2. The flight and control plan for SPM19 SA2 is detailed in Flight and Control Plan Report Attachment C dated 20190114, updated 20190123. Flight plans were based on one hundred twelve (112) south-north oriented flight lines and 12,834 exposures using a planned minimum 62% endlap and 35% sidelap frpom a 3-D flight plan design for Ultracam Eagle 80 & 100 sensors at a planned AMT of about 7554 feet (UCE 80) and 9514' (UCE 100)and a minimum sun angle of 38 degrees, based on terrain and ground relief within each exposure to achieve a ground sample distance across each exposure within NCDOT specified values. The 3-D design resulted in a unique design flight altitude for each line with substantial varying side and forward overlap between exposures. The Eagle 80 sensor acquires a GSD slightly less than six inches at an Above Mean Terrain (AMT) altitude of about 7554 feet. The Eagle 100 sensor acquires a GSD slightly less than six inches at an Above Mean Terrain (AMT) altitude of about 9514 feet. The Flight and Control Plan was based on a single or at most two Aero-Triangulation (AT) blocks for SA2. Flight planning was based upon acquisition of a GSD less than six inches planned and evaluated within a 3-D terrain model to maintain very strict project defined GSD.
Source_Used_Citation_Abbreviation: FLGCPLN
Process_Date: 20190114
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Pre-Paneling and GPS Ground Control Survey. Atlas survey crews recovered, targeted or painted if necessary, twenty-seven (27) existing NC Geodetic Survey monuments, one hundred thirty-four (134) new GPS surveyed locations, and recovered fifty-two (52) prior 2010, 2018 and 2015 project control locations as control for the five Counties of SPM19 Study Area 2 (SA2). The 134 new GPS surveyed points were surveyed by single twenty to thirty minute GPS occupation using OPUS for post processing coordinate calculation or by 3 to 4 minute minimum occupations using the NC RTK network. The 134 new survey points achieved a horizontal positional accuracy of a classical Class A to Class C of Survey having a horizontal accuracy of better than .13 foot per 21NCAC 56.1603. Vertical accuracy was approaching, or better than Class C having an accuracy of typically better than 5 cm. as per NCAC 56.1605(a). Thus, a total of two hundred thirteen (213) GPS surveyed point locations were available for control of the aerial imagery within SPM19 SA2. Slightly more than two-thirds of these control locations were used as primary control in the initial aero-triangulation adjustments of the two AT blocks, with the remainder of the points initially used as checkpoints to test and confirm the accuracy of the AT adjustment. These checkpoints were subsequently merged into a final adjustment as primary control to further densify and tighten the adjustment. All recovered and/or newly surveyed control points were referenced horizontally to NC SPC, NAD83 (2011) US Survey Feet, and vertically to NAVD88 (GEIOD12A), US Survey Feet. All ground control data for SPM19 SA2 was reported in Control Surveys Report Attachment C-1 dated 20190328 and approved by NCGS on 20190501. This report was signed and sealed by the North Carolina Professional Land Surveyor,(PLS) in responsible charge for ground control surveys Larry Kirkpatrick, Atlas NC L-4112 and was submitted to CGIA and NCGS for approval and acceptance. Attachment C-1 for SPM19 SA2 may be obtained from CGIA.
Source_Used_Citation_Abbreviation: GCSA2
Process_Date: 20190328
Source_Produced_Citation_Abbreviation: GC
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 919-380-8752
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Microsoft Ultracam Eagle Digital Airborne Imagery, Airborne GPS and IMU data acquisition. Digital Aerial Imagery, Airborne GPS and IMU data was acquired for SPM19 SA2 by sixteen sorties between dates of 20190225 and 20190403. Keystone Aerial Surveys, Inc. (KAS), as a sub-consultant to Atlas Geographic Data, Inc. (Atlas) acquired digital aerial imagery utilizing three Ultracam Eagle 80 digital airborne sensors and Axis Geospatial LLC acquired digital aerial imagery utilizing one Ultracam Eagle 100 digital airborne sensor, all controlled by Track AIR integrated flight management systems. Raw Airborne GPS and IMU data was collected with Applanix POSAV-510 GPS-IMU systems. Airborne acquisition was conducted during leaf off, cloud free, minimum 38 degree sun angle conditions, in compliance with and or exceeding the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014. A minimum forward endlap of 62% and 35% sidelap was utilized based upon acquisition of an average (slightly less than) design six inch pixel. All flight planning for SPM19 SA2 was based upon a 3-Dimensional flight plan that varied endlap and sidelap and AMT in order to maintain strict GSD across the entire extent of each exposure within the mountainous terrain. Substantial variable side and forward overlap resulted from the use of 3 dimensional flight planning. Airborne acquisition procedures and results are provided within Attachment D Report of Imagery Acquisition Compliance for SPM19 SA2 dated 20190425, amended on 20190515. This report weas submitted to CGIA and NCDOT for acceptance and approval of acquired imagery. Attachment D Report for SPM19 SA2 may be obtained from CGIA.
Source_Used_Citation_Abbreviation: ABGPSIMU
Process_Date: 20190425
Source_Produced_Citation_Abbreviation: DAIMGRY
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Axis Geospatial LLC, Keystone Aerial Surveys, Inc. and Atlas Geographic Data, Inc.
Contact_Position: Sub-Consultant to Atlas Geographic Data, Inc.
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive, Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Digital Airborne Exploitation Imagery Post Processing. The exploitation (raw) digital airborne imagery was post processed taking into consideration to retain the natural imagery color and tone all the while maintaining radiometric and visual consistency across SPM19 Study Area 2 (SA2). Imagery post processing was also conducted to maintain compliance to, and visual match with target exploitation land cover samples analyzed and selected by the State for the entire SPM19 project area. The imagery Post Processing procedures conducted by KAS and Axis acting as sub-consultants to Atlas were conducted fully within these directives and goals and involved sample submittals by Atlas and reviews by CGIA before final imagery radiometry was approved as meeting the SPM19 target samples. Primary front-end post processing within the Microsoft Ultracam workflow develops look-up-tables (LUTs) to provide initial color, tone and contrast solutions for the raw post processed imagery. Upon analyzing and testing selected images from the aerial sorties, then random images from each sortie were tested using this same LUT. If radiometric continuity was found to be within reasonable expectations, the LUT was applied with no modifications. This technical approach was applied across all sorties for all aerial imagery sorties for SA2 and did in fact achieve radiometric consistency within reasonable expectations across the entire study area (SA2). Upon completing primary post processing within the Microsoft-Vexcel Ultracam workflow, minor supplementary "back-end" image post processing was applied systematically to ensure radiometric continuity between each flight line, from sortie to sortie, across the entire project study area, and to further ensure compliance with the State guidelines. Back-End post processing to improve overall radiometric quality and continuity was accomplished at various steps within the orthoimage production process using Socet Set, UltraMap, OrthoVista and Photoshop CS5 software. Systematic and or variable adjustments for color, tone and contrast were tested and applied to individual images, flight lines or entire sorties as necessary to correct issues of radiometric inconsistency. Initial aerial images were post processed as a 4-band (RGB) color, NIR, 12-bit, uncompressed TIFF raster image file. Final digital aerial images were then further post processed as a 3-band (RGB) color, 8-bit, uncompressed TIFF raster image files, tiled at 256 with averaged overviews. Digital airborne image post processing was conducted in compliance with the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014 and the referenced SPM19 Guidelines.
Source_Used_Citation_Abbreviation: DAIMGRY
Process_Date: 20190403
Source_Produced_Citation_Abbreviation: PPDAIMGRY
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Consultant
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Airborne GPS and Inertial Measurement Unit (IMU) Post Processing. Keystone Aerial Surveys, Inc. (KAS)and Axis Geospatial LLC conducted initial airborne GPS-IMU post processing utilizing Smartbase programming procedures. Prior to conducting any sortie, the location of GPS base stations (NC CORS, as well as any needed SC or TN base stations) are selected for use in the airborne kinematic survey that fit the distance limitation of the site location relative to flight distance. The GPS PDOP planning was also performed so that during the flight mission acceptable satellite GPS constellations were available. During the flight mission the aircraft bank angle is restricted to 20 degrees or less to avoid loss of GPS from the satellites. After the flight mission the raw GPS data is backed up and uploaded to the office server until it can be initially quality checked for completeness. It takes about 24 hours after the mission before the CORS data can be downloaded from the NGS server to be used in the data post processing computations. The actual flight trajectory was post processed using smartbase procedures of multiple CORS to calculate a virtual base station primary solution. The flight trajectory was processed with Applanix POSPac 7.1 and POSGNSS version 5.3 software and combined with the IMU data to produce an SBET file. A number of tools within POSPac and POSGNSS software are used to analyze the results. After satisfactory results are obtained with the flight trajectory of the aircraft, then the camera rotations and exterior orientation are created for each image within the flight mission. POSGNSS is a high-precision GNSS post-processor, supporting multiple base stations and featuring very reliable on-the-fly (OTF) kinematic ambiguity resolution (KAR) for single and dual frequency data. The GNSS data can be processed forwards and backwards and combined for an optimal solution. After the GNSS trajectory is created, Inertial Explorer processes the inertial data. Geodetic positions corresponding to the nadir point (photo center) for each exposure were calculated and later used to support surveyed ground control during Aero Triangulation. The sensor perspective centers were accurately surveyed and located offsets with respect to the GPS antenna positions. NC CORS maintained by North Carolina Geodetic Survey were generally used as much as possible as base stations and were active during each sortie. Within the processing a virtual base station was established for each sortie. The satellite Geometry (PDOP or GDOP) was not to be greater than three (3) for 90 percent of the flight lines and not greater than five (5) for the remaining 10 percent. The solution for each sortie was post-processed backward and forward to eliminate errors. GPS-IMU post processing was conducted in compliance with the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014. All sorties were also reported to CGIA and NCDOT within 5 days of flight using the NCDOT EO Checker program to analyze and report results. GPS-IMU post processing procedures and results for SPM19 SA2 are presented in Attachment E Reports entitled GPS-IMU Post Processing and Aerotriangulation for SPM19 SA2 for AT Block 1 dated 20190516 and final revised 20190626 and for AT Block 2 dated 20190517. Reports were submitted to CGIA and NCDOT for acceptance and approval. Attachment E Reports are obtainable from CGIA. The final Airborne GPS coordinates were expressed horizontally in NC SPC NAD83 (2011), US Survey Feet and vertically in NAVD 1988 (GEOID12A), US Survey Feet. The omega, phi and kappa IMU orientation angles were expressed in decimal degrees.
Source_Used_Citation_Abbreviation: AGPSIMU
Process_Date: 20190517
Source_Produced_Citation_Abbreviation: PPAGPSIMU
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Consultant
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Digital Softcopy Aero-Triangulation. Axis Geospatial, LLC (AXIS) acting as a sub-consultant to Atlas Geographic Data, Inc. completed all phases of Digital Softcopy Aero-Triangulation (AT) for the two AT Blocks of Study Area 2 (SA2). The basic purpose of the AT adjustment is to utilize and also verify survey ground control and dramatically increase the density of photo control resulting in sufficient control for the orientation of all stereo models for 3D softcopy applications and individual image exterior orientation parameters ( X, Y, Z, Omega, Phi, Kappa) necessary for Orthoimagery production. Atlas Team Photogrammetry member Axis Geospatial uses UltraMap Bingo software for performing Aero-Triangulation and Atlas uses Hexagon ImageStation AT software. Raw images are combined with the post processed ABGPS and IMU values and are imported into the software for initial orientation. After a visual inspection of the initial orientations pass a QA/QC review, then automatic point measuring (APM) is performed for all images in an AT block. Axis uses different types of APM strategies based on land content and vertical displacement between images to achieve the best possible number of acceptable correlated points. After the APM has been accepted, AT photogrammetry technicians begin the process of removing the uncorrelated measured points and cleaning the photogrammetry. Bingo and ImageStation have a number of advanced program and measurement tools for use in finding, removing or adjusting unacceptable correlated points. The cleaning process is done in phases by removing only the largest uncorrelated points first, running a solution, analyzing the results and then moving forward based on the results. The cleaning process continues until all major issues within the photogrammetry portion of the Aero-Triangulation solution have been identified and eliminated. ABGNSS values for each image, Ground Control, and Checkpoint values are introduced into the AT block at this stage as well. All Ground Control, Checkpoints and adjacent Block Tie points are measured manually on all image frames to which they intersect. Checkpoints are treated the same as pass points and not as Primary Control points. Gaps where too many pass or tie points have been eliminated are filled in with manually measured points and tied to all images to which they intersect. Sigma values, ABGPS residual values, control residual values, and checks between the actual Checkpoint value and the computed Checkpoint value are all analyzed for proper adherence to specification and expected results. Bingo and ImageStation have numerous tools and methods for analyzing Aero-Triangulation results with many different additional analyses that can be used to achieve a final solution that is reliable, within technical specifications and expected within a given project photogrammetric parameters. The final pass, tie and control point coordinates derived from the AT are expressed horizontally in NC SPC NAD83 (2011), US Survey Feet and vertically in NAVD 1988 (GEOID12A), US Survey Feet. The exterior orientation parameters X, Y and Z were expressed horizontally in NC SPC NAD83 (2011), US Survey Feet and vertically in NAVD 1988 (GEOID12A), US Survey Feet. The exterior orientation angles omega, phi and kappa were expressed in decimal degrees. The AT process was conducted in compliance with the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014. AT procedures and results for SPM19 SA2 are detailed in Attachment E Reports entitled GPS-IMU Post Processing and Aero-Triangulation SPM19 SA2 for AT Block 1 dated 20190516 and final revised 20190626 and AT Block 2 dated 20190517. Reports were submitted to CGIA and NCDOT for acceptance and approval. Attachment E reports may be obtained from CGIA.
Source_Used_Citation_Abbreviation: DAIMGRY, AGPSIMU, GCSA2
Process_Date: 20190517
Source_Produced_Citation_Abbreviation: ATSA2
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
LiDAR Digital Elevation Model (DEM) review and update. Axis Geospatial, LLC (AXIS) acting as a sub-consultant to Atlas Geographic Data, Inc. (Atlas) and Atlas Geographic Data, Inc. reviewed, edited and updated the NC Floodplain Mapping LiDAR elevation data (as needed) at a density level sufficient to accurately represent the shape of the ground and to meet the required ASPRS Class I horizontal accuracy for ground level features at a design scale of 1:2,400 (1 in equals 200 ft) where the limiting RMSE in either X or Y is not greater than 1.5 ft. The existing 20 ft by 20 ft TINs file and the bare earth file were used from the NC Floodplain Mapping LiDAR for representation of the ground level DEM in this SPM19 SA2 project. NCDOT provided a construction history shapefile which was converted to ArcGIS and utilized during the NC Floodplain Mapping LiDAR review and update task. The ArcGIS construction history data was converted and referenced to the NC Floodplain Mapping LiDAR bare earth data and TINs data in 3D utilizing UltraMap and ImageStation softcopy workstation software. UltraMap and DATEM software tools were used to replace the LiDAR elevation points in areas where new construction had added new cultural features or reformed the shape of the ground. In addition to the construction history shapefile, NCDOT provided a bridge location shapefile which was also converted to ArcGIS and utilized during the internal (Axis and Atlas) Level 1 Macro Quality Assurance Quality Control (QA/QC) review process to visit each bridge location in the initial orthorectified images within Study Area 2 (SA2) to determine if special DEM treatment was required to eliminate distortion from the bridge, overpass or culvert. Additional LiDAR DEM updates were made as a result of VOICE quality control resolutions reported from Levels 2 and 3 QA/QC reviews as a part of Attachment G lifecycle. The DEM update files were delivered to CGIA with the final (DO3) County Delivery Order of Orthoimagery.
Source_Used_Citation_Abbreviation: LIDAR DEM, DAIMGRY, AT, CONHIST, BRIDGLOC
Process_Date: 20191031
Source_Produced_Citation_Abbreviation: DEMSA2
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Exploitation image rectification to an Orthoimage. Axis Geospatial, LLC (AXIS) acting as a sub-consultant to Atlas Geographic Data, Inc. (AGD) and Atlas Geographic Data, Inc. utilized Microsoft Vexcel UltraMap and ImageStation OrthoPro software for image rectification based upon information developed for each image frame from the digital aero-triangulation solution. This included application of the Digital Elevation Model (DEM) data to the image using a cubic convolution algorithm to achieve the image rectification taking fully into account sensor attitude and altitude (from AT) and ground relief (from DEM). The resultant rectified orthoimages were used for the purpose of visual internal quality control of imagery characteristics as well as later mosaicking into a geospatially continuous orthoimagery dataset. During the image rectification and subsequent seamline digitizing process, each image was visually inspected for overall image quality, distortion due to erroneous LiDAR data, artifacts, clouds, cloud shadows, smoke or any other anomaly that would not comply with the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014. The NCDOT bridge location data was also used during this process step to visit each bridge, overpass or major culvert location to determine if special DEM treatment would be necessary to remove distortion from these features. Any imagery issues discovered by this in-house QA/QC review were either corrected by additional DEM editing or documented for later correction in the image mosaicking process.
Source_Used_Citation_Abbreviation: DAIMGRY, PPDAIMGRY, ATSA2, LIDAR DEM, DEMSA2
Process_Date: 20191031
Source_Produced_Citation_Abbreviation: ORTHORIMG
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 920-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Seamline Development Digitizing and Seamline Polygon Generation. Axis Geospatial, LLC (AXIS) acting as a sub-consultant to Atlas Geographic Data, Inc. and Atlas Geographic Data, Inc. (Atlas) initially used UltraMap and Imagestation Orthopro software to autocorrelate and develop seamlines using the advanced pixel matching and 3-D stereo model ground feature interpretation capability of the software. Photogrammmetry technicians then visually inspected each rectified orthoimage to determine the most precise and logical locations to edit autocorrelated seamlines. This visual evaluation was based upon an attempt to generate as much of the final imagery from the nadir portion of each image frame and locate seamlines along linear features where the seam effect is least visual and has no detriment to the final orthoimagery. This included avoiding features such as buildings, structures, etc. This mosaic process is conducted taking into account adjoining frame images down each flight line as well as imagery from adjacent sidelap flight lines. The goal is to develop the best possible geospatially continuous orthoimage across the entirety of Study Area 2 (SA2). Automatic seamline or mosaic polygon generation software tools were used to generate initial seamlines within visually consistent terrain such as farmland and pine plantation. The digitized seamlines and resulting seamline polygons were visually inspected, refined and updated throughout the production and quality control process steps. Final seamline polygon data was processed and delivered within an ESRI shapefile format with attributes to include flight line number, exposure number, image acquisition date, and ESRI generated parameters of area and perimeter distance. Seamline data for SA2 has been documented and more fully described as a separate metadata file for SPM19 SA2. This separate and independent Study Area 2 seamline metadata file can be obtained from CGIA.
Source_Used_Citation_Abbreviation: ORTHORIMG
Process_Date: 20191031
Source_Produced_Citation_Abbreviation: SEAMLN
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Final Orthoimagery seamline editing, color balancing and final Image Processing Adjustments. Axis Geospatial, LLC (AXIS) acting as a sub-consultant to Atlas Geographic Data, Inc.(Atlas) and Atlas Geographic Data, Inc. performed final Orthoimagery editing to include seamline edits, linear feature edits, color balancing, elevated structure edits, artifact removal, and Orthoimagery tile boundary edits using Cardinal Systems VrONE, UltraMap and Orthovista software. Photoshop was used for some selected image cosmetic edits. A geometrically and radiometrically seamless digital orthoimage was produced across the full extent of SPM19 SA3 by these final image processing tasks. Final imagery color balance and contrast was extensively reviewed and adjusted to match as close as possible to the SA3 target sample and six pack samples that were selected by CGIA and NC DOT during the imagery acquisition phase of the project in February through March 2019. Further, final imagery color balance and contrast were carefully compared to imagery from adjacent Study Area 1 (to the west) and Study Area 3 (to the east) of this SPM19 SA2 project. In the final image adjustment, back-end, post processing step, the image statistics and settings derived from the exploitation image target sample review were applied to each sortie, tested and modified slightly if necessary using images from each flight line of each sortie to ensure overall radiometry and compliance with the SPM19 Guidelines and six pack target samples. Random final back-end adjusted exploitation images from each sortie were visually compared to the target sample and Study Area border exploitation images to ensure overall consistency across the entirety of SA2.
Source_Used_Citation_Abbreviation: DAIMGRY, PPDAIMGRY, SEAMLN, DEMSA2
Process_Date: 20191031
Source_Produced_Citation_Abbreviation: ORTHOIMGSA2
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Orthoimage Tile Mosaic Processing. Axis Geospatial, LLC (AXIS) acting as a sub-consultant to Atlas Geographic Data, Inc. (Atlas) and Atlas Geographic Data, Inc. utilized ESRI ArcGIS to cut Orthophoto tile polygons from final orthorectified exploitation imagery during the final mosaic process step. A State grid map file was imported into ArcGIS using grid definitions for the 5,000' x 5,000' orthoimage tiles required for Study Area-2 (SA2) as defined in the Excel spreadsheet, SPM19_Tile_Delivery_Order.xlsx, provided by CGIA. The final orthoimages, seamline polygons and product definitions were processed in the final mosaic process step to output the final 5,000' x 5,000' orthoimage tiles. All SA2 final orthoimages, mosaic polygons and product definitions were processed simultaneously to ensure the final mosaic output, edge matching, color and tone balancing is consistent across the entire study area. The orthoimage tiles were named using the required file naming convention (e.g. OC6i0_37_000_20043704_20190225_0403R0.tif). The orthoimage tiles were subject to four (4) different levels of quality control. Resolutions for problems detected during these levels of quality control were documented and reported in Product Review documentation maintained at edit call locations on VOICE, the on-line image service for the SPM19 project as well as on the SPM19 Sharepoint site. Delivery of the final orthoimage tiles and ancillary data was documented and reported in Attachment F Orthoimagery Delivery Reports for each of the five (5) Counties within SPM19 SA2. Attachment F reports may be obtained from CGIA. The SPM19 SA2 County Delivery Orders comprised 2910 map tiles (2610 sq. mi.).
Source_Used_Citation_Abbreviation: ORTHOIMGSA2, INDEX
Process_Date: 20191031
Source_Produced_Citation_Abbreviation: OIMGTILE
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Atlas Geographic Data, Inc.
Contact_Position: Prime Vendor
Contact_Address:
Address_Type: mailing and physical address
Address: 215 Racine Drive
Address: Suite 201
City: Wilmington
State_or_Province: NC
Postal_Code: 28403
Country: USA
Contact_Voice_Telephone: 910-256-9892
Contact_Facsimile_Telephone: 910-256-9979
Contact_Electronic_Mail_Address: lkirkpatrick@atlasgeodata.com
Process_Step:
Process_Description:
Create an image service from finished orthoimagery submitted by contractors to display in an online application for visual quality review.
Source_Used_Citation_Abbreviation: OIMGTILE
Process_Date: 2019
Source_Produced_Citation_Abbreviation: OIMGSERV
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Airbus DS Geo, Inc.
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 2721 Council Tree Avenue, Suite 206
City: Fort Collins
State_or_Province: CO
Postal_Code: 80525
Country: USA
Contact_Voice_Telephone: 970-372-6155
Contact_Facsimile_Telephone: 970-218-5838
Contact_Electronic_Mail_Address: mmiddendorf@airbus-na.com
Process_Step:
Process_Description:
Visual quality control consisted of several levels of review. Project contractors conducted both initial macro and micro lever review of all data. After the data was released to the State, NCDOT reviewed 30% of each county's ortho tiles, CGIA reviewed 5% and the counties had the ability to review the full county worth of data but were provided a list of 25% of required tiles to review. CGIA then reviewed all submitted issues and submitted those considered to be in scope to project guidelines to the contractors for review. Contractor teams reviewed these submitted issues and assessed whether a fix was feasible. Tiles that were repaired were validated by NCDOT to ensure that fixes were made and did not introduce new issues. All review by NCDOT, CGIA and other end-users as well as contractor's assessment and evaluation were conducted in a cloud-hosted environment accessible through an online mapping interface called VOICE.
Source_Used_Citation_Abbreviation: OIMGSERV
Process_Date: 2019
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NC Center for Geographic Information and Analysis
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing address
Address: 20322 Mail Service Center
City: Raleigh
State_or_Province: NC
Postal_Code: 27699-0322
Country: USA
Contact_Voice_Telephone: 919-754-6377
Contact_Facsimile_Telephone: 919-715-8551
Contact_Electronic_Mail_Address: ben.shelton@nc.gov
Process_Step:
Process_Description:
Horizontal quality control consists of utilizing quality control test points obtained from an independent source of higher accuracy of the tested product. The purpose of the quality control test is to determine the horizontal accuracy of the product and produce a report documenting the result of the accuracy test.
Source_Used_Citation_Abbreviation: OIMGTILE
Process_Date: 2019
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NC Geodetic Survey
Contact_Position: Director
Contact_Address:
Address_Type: mailing address
Address: 4105 Reedy Creek Road
Address: NC National Guard Complex
City: Raleigh
State_or_Province: NC
Postal_Code: 27699-4298
Country: USA
Contact_Voice_Telephone: 919-733-3836
Contact_Facsimile_Telephone: 919-733-4407
Contact_Electronic_Mail_Address: gary.thompson@ncdenr.gov
Process_Step:
Process_Description:
20:1 MRSID Tile Creation- CGIA created a standalone 20:1 compressed copy of each orthoimagery tile delivered in the SPM19 project. Lizardtech software was used to compress each TIFF tile to a 20:1 MRSID formatted file. The resulting MRSID files maintain the same file name as the TIFF tiles.
Source_Used_Citation_Abbreviation: OIMGTILE
Process_Date: 2019
Source_Produced_Citation_Abbreviation: MRSID
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NC Center for Geographic Information and Analysis
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing address
Address: 20322 Mail Service Center
City: Raleigh
State_or_Province: NC
Postal_Code: 27699-0322
Country: USA
Contact_Voice_Telephone: 919-754-6377
Contact_Facsimile_Telephone: 919-715-8551
Contact_Electronic_Mail_Address: ben.shelton@nc.gov
Process_Step:
Process_Description:
50:1 MRSID Countywide Mosaic Creation- CGIA created a standalone 50:1 compressed file of all of the imagery that intersects each county. Lizardtech software was used to merge all of the 20:1 MRSID tiles into a unified singular 50:1 compressed file containing all imagery for a county, excluding any sensitive military areas.
Source_Used_Citation_Abbreviation: MRSID
Process_Date: 2019
Source_Produced_Citation_Abbreviation: MRSIDMOS
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NC Center for Geographic Information and Analysis
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing address
Address: 20322 Mail Service Center
City: Raleigh
State_or_Province: NC
Postal_Code: 27699-0322
Country: USA
Contact_Voice_Telephone: 919-754-6377
Contact_Facsimile_Telephone: 919-715-8551
Contact_Electronic_Mail_Address: ben.shelton@nc.gov
Process_Step:
Process_Description:
CGIA product validation process: Before delivery of data to each county, CGIA validated that each county would receive all TIFF and MRSID 20:1 compression tiles that intersect that county and ensured that the files were named correctly, were correctly spatially referenced, and validated that each drive contains a countywide MRSID 50:1 compression mosaic, an index shapefile denoting the location of each tile, a seamline polygon that denotes the location and date of each discrete image used to create the imagery, project documentation about the ortho creation process, any updated elevation information, and both MRSID 20:1 compression tiles and a MRSID 50:1 mosaic for each neighboring county.
Process_Date: 2019
Source_Produced_Citation_Abbreviation: VALID
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NC Center for Geographic Information and Analysis
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing address
Address: 20322 Mail Service Center
City: Raleigh
State_or_Province: NC
Postal_Code: 27699-0322
Country: USA
Contact_Voice_Telephone: 919-754-6377
Contact_Facsimile_Telephone: 919-715-8551
Contact_Electronic_Mail_Address: ben.shelton@nc.gov