Radiometry (image visual consistency) for the six Counties of Study Area 4 (SA4) 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 SA4 and in conformance with imagery of adjacent CO20 study areas SA3 (to the north) and SA5 (to the west), 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 SA4 in March 2020 from initial imagery acquisition of 2020. Eight bit/4-band, RGB, uncompressed sample exploitation images from six-pack SA4 overlap areas with SA2 and SA5 were evaluated by the State from SA4 initial imagery acquisition relative to the previously provided target samples and SA2/SA5 imagery. Approval of the SA4 imagery was provided in a communication from CGIA in March 2020. The digital image processing involves first using the Hexagon Leica DMCIII HxMap post processing software suite, Digital Image Analyst and GeoCue distributed processing software. After image acquisition, data is copied to a central network storage system. DMCIII project imagery data is exported for each day of acquisition. Data is then imported into a Hexagon Leica HxMap software workstation 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. 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 manually digitized with auto-generation assistance using ImageStation software and then 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-4 (SA4). Manually digitized seamlines (using mosaic polygon generation tools) were generally used throughout the Study Area, 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 SA4 orthoimage tiles were full tiles, 5,000' x 5,000', with no void areas. Imagery within USMC military security areas of Camp Lejeune and Cherry Point as well as selected other USMC properties were redacted from public view with black pixels within the polygon boundaries that were approved by the USMC. 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.
Publication_Date: 20191223
Title: Flight and Control Plan: CO20 SA4, Attachment C
Edition: 1.0
Geospatial_Data_Presentation_Form:
Microsoft Word DOC, Adobe PDF, Excel Spreadsheet, ESRI Shapefiles, Google kmz files, and DMCIII flight 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: 2020
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 CO20 Scope of work.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Aerodata Digital Aerial Imagery, Inc. (Aerodata) and Atlas Geographic Data, Inc.
Publication_Date: 20200315
Title:
Flight and Control Plan for Validation Range, Expedited Camera Report Leica DMCIII #27546
Edition: 1.0
Geospatial_Data_Presentation_Form:
Microsoft Word DOC, Adobe PDF, Excel Spreadsheet, ESRI Shapefiles, Google kmz files, and Leica DMCIII files.
Publication_Information:
Publication_Place: Wilmington, NC
Publisher: Atlas Geographic Data Inc. for CO20 SA4
Type_of_Source_Media: FTP, disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2020
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: NCVR
Source_Contribution:
Digital sensor DMCIII #27546 acquired imagery of the North Carolina Validation Range in Surry County, NC in February 2020. The Flight and Ground Control Plan was completed in January 2020 with subsequent reports prepared for the sensor being Expedited Camera System report for Validation Range with Aerodata sensor DMCIII #27546 submitted and approved by NCDOT on 20200316 with an Advisory report. Sensor DMCIII #27546 was approved for use by CGIA and NCDOT.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Aerodata Digital Aerial Imagery, Inc. (Aerodata) and Atlas Geographic Data, inc.
Publication_Date: 20200221
Title:
Flight and Control Plan for Validation Range, Expedited Camera Report Leica DMCIII #27551
Edition: 1.0
Geospatial_Data_Presentation_Form:
Microsoft Word DOC, Adobe PDF, Excel Spreadsheet, ESRI Shapefiles, Google kmz files, and Leica DMCIII files.
Publication_Information:
Publication_Place: Wilmington, NC
Publisher: Atlas Geographic Data Inc. for CO20 SA4
Type_of_Source_Media: FTP, disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2020
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: NCVR
Source_Contribution:
Digital sensor DMCIII #27551 acquired imagery of the North Carolina Validation Range in Surry County, NC in February 2020. The Flight and Ground Control Plan was completed in January 2020 with subsequent reports prepared for the sensor being Expedited Camera System report for Validation Range with Aerodata sensor DMCIII #27551 submitted and approved by NCDOT on 20200225 with an Advisory report. Sensor DMCIII #27551 was approved for use by CGIA and NCDOT.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Atlas Geographic Data, Inc.
Publication_Date: 2020
Title: Leica DMCIII 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
Publisher: Atlas Geographic Data Inc. and Aerodata
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20200202
Single_Date/Time:
Calendar_Date: 20200301
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: DAIMGRY
Source_Contribution:
The raw exploitation digital airborne imagery acquired by two Leica DMCIII digital sensors served as the foundation image component for CO20 Study Area-4 (SA4) within the coastal plain terrain of SA4. The raw imagery for SA5 was collected at a planned altitude of about 10,900 feet Above Mean Terrain (AMT) for DMCIII sensors using a 2-Dimensional terrain flight plan method to capture imagery at at average 5.5 inch (14 cm) pixel resolution and within NC DOT specified Ground Sample Distances (GSD) across each image in thirteen (13) sorties utilizing a planned minimum 60% forward lap and 32% sidelap format. 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 4-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 CO20 SA4 within one Imagery Acquisition Compliance Report. Attachment D report for AT Block 1 dated 20200324 and amended 20200330. Attachment D report may be obtained from CGIA.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Atlas Geographic Data Inc.
Publication_Date: 2020
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
Publisher: Atlas Geographic Data Inc. and Aerodata
Type_of_Source_Media: disc and FTP
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20200202
Single_Date/Time:
Calendar_Date: 20200301
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 (GEOID18), 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 CO20 SA4 within Airborne GPS_IMU Post Processing Report Attachment E for AT Block 1 dated 20200514 that was final revised on 20200529. Attachment E report may be obtained from CGIA.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Atlas Geographic Data Inc.
Publication_Date: 2020
Title:
Ground Control Data and Surveys Report Attachment C-1, CO20 SA4 AT Block 1
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: 20200528
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: GCSA4
Source_Contribution:
The Ground Control data provides precise NC State Plane geodetic coordinates and elevations for pre-paneled and photo-identifiable positions throughout CO20 Study Area 4 (SA4). 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 4, one hundred fifty-seven (157) 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. Forty-five (45) existing NCGS monuments were recovered and paneled and thirty-eight (38) GPS surveyed points from the prior CO16 orthoimagery project were field researched and recovered. These CO16 prior orthoimagery project points were provided by NCGS and CGIA as excel spreadsheets with pdf pictures and location descriptions. This totaled 240 ground control points for all of SA4. Sixty-eight (68) ground control points were used as Checkpoints within the Aero-Triangulation adjustment of the single AT Block for SA4 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 (GEOID18), US Survey Feet. Ground Control data and surveys were reported within Attachment C-1 Control Surveys Report for CO20 SA4 dated 20200220, revision R1 dated 20200226, revision R2 dated 20200528 and approved by NCGS in Advisory report dated 20200226.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NC Department of Transportation
Publication_Date: 2020
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: 20190722
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 CO20 Study Area-4 (SA4) 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: 2020
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: 20200320
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 CO20 Study Area-4 (SA4) 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: 2020
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: 2020
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: 2020
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: 2020
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. Two airborne acquisition systems owned and operated by Aerodata, each comprised of a twin engine Cessna with a Leica DMCIII Digital Airborne Sensor (#27546 and #27551) using Northrop Grumman LC1-100C GPS-IMU systems and hexagon FlightPro flight management system software were verified and certified for use on the CO20 SA4 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. The NC validation Range was performed as a mini project, delivering all products and reports required under the CO20 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 Expedited Reports dated March 15, 2020 for sensor #27546 and February 21, 2020 for sensor #27551. The primary sensor validation process involved a direct comparison by NCDOT of coordinates for blind paneled and photo ID checkpoints (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: 20200315
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) planned and identified flight and control plans for CO20 SA4 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 CO20 Project Task 2. The flight and control plan for CO20 SA4 is detailed in Flight and Control Plan Report Attachment C dated 20191223. Flight plans were based on sixty-three (63) south-north oriented flight lines and 5,362 exposures, plus seven (7) elevated bridge nadir lines having in total 34 exposures using a planned minimum 60% endlap and 32% sidelap frpom a 2-D flight plan design for Leica DMCIII sensors at a planned AMT of about 10,900 feet and a minimum sun angle of 33 degrees, based on terrain and ground relief within each exposure to achieve a ground sample distance across each exposure within NCDOT specified values. The Leica DMCIII sensor acquires a GSD of about 5.5 inches at an Above Mean Terrain (AMT) altitude of 10,900 feet. The Flight and Control Plan was based on a single or at most two Aero-Triangulation (AT) blocks for SA4.
Source_Used_Citation_Abbreviation: FLGCPLN
Process_Date: 20191223
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, forty-five (45) existing NC Geodetic Survey monuments, one hundred fifty-seven (157) new GPS surveyed locations, and recovered thirty-eight (38) prior CO16 project control locations as control for the six Counties of CO20 Study Area 4 (SA4). The 157 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 157 new survey points achieved a horizontal positional accuracy of a classical Class A Survey having a horizontal accuracy of better than .10 foot per 21NCAC 56.1603. Vertical accuracy was 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 forty (240) GPS surveyed point locations were available for control of the aerial imagery within CO20 SA4. One hundred seventy-two (172) of these control locations were used as primary control in the initial aero-triangulation adjustments of a single AT block, with the remainder of the points (68) 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 (GEIOD18), US Survey Feet. All ground control data for CO20 SA4 was reported in Control Surveys Report Attachment C-1 dated 20200220, revised (R1) 20200226, revised (R2) 20200528 and approved by NCGS on 20200226. 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 CO20 SA4 may be obtained from CGIA.
Source_Used_Citation_Abbreviation: GCSA4
Process_Date: 20200528
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:
Leica DMC III Digital Airborne Imagery, Airborne GPS and IMU data acquisition. Digital Aerial Imagery, Airborne GPS and IMU data was acquired for CO20 SA4 by thirteen sorties between dates of 20200202 and 20200301. Aerodata, as a sub-consultant to Atlas Geographic Data, Inc. (Atlas) acquired digital aerial imagery utilizing two Leica DMC III digital airborne sensors both controlled by Leica MissionPro FlightPro integrated flight management systems. Raw Airborne GPS and IMU data was collected Northrop Grumman LC1-100C GPS-IMU systems. Airborne acquisition was conducted during leaf off, cloud free, minimum 30 degree sun angle conditions, in compliance with and or exceeding the North Carolina Technical Specifications for Digital Orthophoto Base Mapping, adopted December 11, 2014. The standard project specification of minimum 33 degree sun angle was relaxed to 30 degrees in mid-february 2020 when it was realized that the 2020 flight season was going to be significantly shortened (from the typical) due to very warm weather and early budding of deciduous shrubs and trees. A minimum forward endlap of 60% and 32% sidelap was utilized based upon acquisition of an average 5.5 inch (14 cm) pixel. All flight planning for CO20 SA4 was based upon a 2-Dimensional flight plan that achieved consistent endlap and sidelap and AMT in order to maintain strict GSD across the entire extent of each exposure within the reasonably flat coastal terrain. Airborne acquisition procedures and results are provided within Attachment D Report of Imagery Acquisition Compliance for CO20 SA4 dated 20200324, amended on 20200330. This report weas submitted to CGIA and NCDOT for acceptance and approval of acquired imagery. Attachment D Report for CO20 SA4 may be obtained from CGIA.
Source_Used_Citation_Abbreviation: ABGPSIMU
Process_Date: 20200330
Source_Produced_Citation_Abbreviation: DAIMGRY
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, 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 as well as infrared band and tone all the while maintaining radiometric and visual consistency across CO20 Study Area 4 (SA4). Imagery post processing was also conducted to maintain compliance to, and visual match with target exploitation samples analyzed and selected by the State for the entire CO20 project area. The imagery Post Processing procedures conducted by Aerodata as sub-consultant to Atlas was 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 CO20 target samples. Primary front-end post processing within the Hexagon Leica system 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 SA4 and did in fact achieve radiometric consistency within reasonable expectations across the entire study area (SA4). Upon completing primary post processing within the Hexagon Leica 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 ImageStation and Photoshop 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 4-band (RGB) color, NIR, 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 CO20 Guidelines.
Source_Used_Citation_Abbreviation: DAIMGRY
Process_Date: 20200330
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. Aerodata conducted initial airborne GPS-IMU post processing utilizing multi-base programming procedures. Prior to conducting any sortie, the location of GPS base stations (NC CORS) 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 multi-base procedures of multiple CORS to calculate a primary solution. The flight trajectory was processed with Northrop Grumman LC1-100C software and combined with the IMU data to produce an SBET file. A number of tools within the 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. The GNSS data was 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. 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 (GEO) Checker program to analyze and report results. GPS-IMU post processing procedures and results for CO20 SA4 are presented in Attachment E Report entitled GPS-IMU Post Processing and Aerotriangulation for CO20 SA4 for AT Block 1 dated 20200514 and final revised 20200529. 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 (GEOID18), US Survey Feet. The omega, phi and kappa IMU orientation angles were expressed in decimal degrees.
Source_Used_Citation_Abbreviation: AGPSIMU
Process_Date: 20200529
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. Atlas Geographic Data, Inc. completed all phases of Digital Softcopy Aero-Triangulation (AT) for the single AT Block of Study Area 4 (SA4). The basic purpose of the AT adjustment is to utilize and also verify survey ground control and EO airborne GNSS-IMU coordinates to 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 uses Hexagon ImageStation AT (ISAT) software for performing Aero-Triangulation. 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 both manual operator points selection assisted by automatic point measuring (APM) is performed for all images in an AT block. After the initial selected and APM dataset has been accepted, AT photogrammetry technicians begin the process of removing the uncorrelated measured points and cleaning the photogrammetry. Hexagon ImageStation AT software has 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. ImageStation has 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 (GEOID18), 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 (GEOID18), 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 CO20 SA4 are detailed in Attachment E Reports entitled GPS-IMU Post Processing and Aero-Triangulation CO20 SA4 for AT Block 1 dated 20200514 and final revised 20200529. 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, GCSA4
Process_Date: 20200517
Source_Produced_Citation_Abbreviation: ATSA4
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. Avioimage Mapping Services, Inc. (Avioimage) 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 1:1,200 (1 in equals 100 ft) where the limiting RMSE in either X or Y is not greater than 1.0 ft. The existing 20 ft by 20 ft TINs file (re-gridded by Atlas to a 10 ft. x 10ft. file) and the bare earth file were used from the NC Floodplain Mapping LiDAR for representation of the ground level DEM in this CO20 SA4 project. Atlas compared all CO20 SA4 imagery to that which had been produced in CO16. All changes areas and features were flagged and then analyzed and separated for those which might affect orth rectificaton. This included all bridge and overpass structures. Three major new 4-lane highway constructions were mapped-out: being Hwy 17 between jacksonville and New Bern, a new bypass north of Kinstopn and a new bypass north of Beaufort. 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. Hexagon Imagestation 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 (Avioimage 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 4 (SA4) to determine if special DEM treatment was required to eliminate distortion from the bridge, overpass or culvert. A few 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: 20200630
Source_Produced_Citation_Abbreviation: DEMSA4
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. Atlas Geographic Data, Inc. utilized 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, ATSA4, LIDAR DEM, DEMSA4
Process_Date: 20200727
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. Atlas Geographic Data, Inc. (Atlas) initially used operator selected and digitized seamlines in conjunction with 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 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 4 (SA4). Automatic seamline or mosaic polygon generation software tools were sometimes 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 SA4 has been documented and more fully described as a separate metadata file for CO20 SA4. This separate and independent Study Area 4 seamline metadata file can be obtained from CGIA.
Source_Used_Citation_Abbreviation: ORTHORIMG
Process_Date: 20200727
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. 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 Hexagon ImageStation and adobe Photoshop software. Photoshop was used for some selected image cosmetic edits. A geometrically and radiometrically seamless digital orthoimage was produced across the full extent of CO20 SA4 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 SA4 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 2020. Further, final imagery color balance and contrast were carefully compared to imagery from adjacent Study Areas. 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 CO20 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 SA4.
Source_Used_Citation_Abbreviation: DAIMGRY, PPDAIMGRY, SEAMLN, DEMSA4
Process_Date: 20200727
Source_Produced_Citation_Abbreviation: ORTHOIMGSA4
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. 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-4 (SA4) as defined in the Excel spreadsheet, CO20_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 SA4 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. OF6i0_37_000_20638604_20200202_0301R0.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 CO20 project as well as on the C)20 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 six (6) primary delivery Counties within C020 SA4. Attachment F reports may be obtained from CGIA. The CO20 SA4 County Delivery Orders comprised 4155 map tiles (3726 sq. mi.).
Source_Used_Citation_Abbreviation: ORTHOIMGSA4, INDEX
Process_Date: 20201001
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: 2020
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: 970-482-4400
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: 2020
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: 2020
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 CO20 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: 2020
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: 2020
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: 2020
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