City of Wahpeton, ND Digital Orthophotography and Topographic Mapping

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: City of Wahpeton, ND
Publication_Date: 20121130
Title:
City of Wahpeton, ND Digital Orthophotography and Topographic Mapping
Publication_Information:
Publication_Place: Wahpeton, ND
Publisher: City of Wahpeton, ND
Description:
Abstract:
This image and LiDAR data is the result of private and government entities working together under the guidance of the City of Wahpeton, ND. Fugro Earthdata, Inc. acquired Digital Imagery with sensor ADS80 SH82 for areas of Wahpeton, ND project area April 11, 2012. The project encompassed an area of approximately 24 square miles. A Leica ADS80/SH82 Digital Camera system including an inertial measuring unit (IMU) and a dual frequency airborne GPS receiver was used for the digital image acquisition. Imagery acquisition was performed April 11, 2012 at 2400' AMT (above mean terrain), with 30 percent sidelap between the flight lines. Ground control survey was provided by the City of Wahpeton. Digital orthophotos in TIFF format were produced with a resolution of 0.25 foot utilizing the ADS80/SH82 imagery and the Red River mapping Initiative LiDAR DEM. Delivery was on an External Hard Drive. Fugro Earthdata, Inc. acquired LiDAR data with Fugro's proprietary LiDAR sensor for of Wahpeton, ND project area March 30,2012. The project encompassed an area of approximately 7.6 square miles. A FLIMAP LiDAR system including an inertial measuring unit (IMU) and a dual frequency airborne GPS receiver was used for the LiDAR acquisition. Acquisition was performed March 30, 2012 at 2100' AMT (above mean terrain), with 20 percent sidelap between the flight lines. Ground control survey was provided by the City of Wahpeton. Delivery was on an External Hard Drive.
Purpose: The orthophotos will be used for GIS and planning.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20120330
Ending_Date: 20121130
Currentness_Reference: Acquisition Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -096.679236
East_Bounding_Coordinate: -096.574127
North_Bounding_Coordinate: +46.355299
South_Bounding_Coordinate: +46.209747
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Aerial Photography
Theme_Keyword: Orthophoto
Theme_Keyword: LiDAR
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: ND
Place_Keyword: Wahpeton
Access_Constraints: There are no limitations for access.
Use_Constraints: unknown
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: City of Wahpeton
Contact_Person: Randy Nelson
Contact_Position: Public Works Director
Contact_Address:
Address_Type: mailing and physical address
Address: 1900 Fourth Street North
City: Wahpeton
State_or_Province: ND
Postal_Code: 58075
Country: United States
Contact_Voice_Telephone: 701-642-6565
Contact_Electronic_Mail_Address: RandyN@wahpeton.com
Hours_of_Service: 8am-5pm, Central Time
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
GPS phase data was post processed with continuous kinematic survey techniques using "On the Fly" (OTF) integer ambiguity resolution. The GPS data was processed with forward and reverse processing algorithms. The results from each process, using the data collected at the airport, were combined to yield a single fixed integer phase differential solution of the aircraft trajectory. The differences between the forward to reverse solution within the project area were within project specifications (<10cm) in both the horizontal and vertical components, indicating a valid and accurate solution. An IMU was used to record precise changes in position and orientation of the ADS80 Digital Camera System. All IMU data was processed post flight with a filter to integrate inertial measurements and precise phase differential GPS positions. The resulting solution contains geodetic position, omega, phi, kappa, and time for digital image processing.
Logical_Consistency_Report: Tiling is based on quarter section sheets.
Completeness_Report: Complete
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The orthophotography meets National Map Accuracy Standards of 1947 for map scale at 1" = 50'
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Fugro Earthdata, Inc.
Publication_Date: 20121130
Title:
City of Wahpeton, ND Digital Orthophotography and Topographic Mapping
Source_Scale_Denominator: 6000
Type_of_Source_Media: Digital Data
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20120330
Ending_Date: 20120411
Source_Currentness_Reference: Date of Photography
Source_Citation_Abbreviation: Ortho Imagery and LiDAR
Source_Contribution: ADS80 SH82 and FLIMAP
Process_Step:
Process_Description:
The Leica GeoSystems XPro software was used for downloading and preparing imagery collected with the ADS80 Airborne Digital Sensor for softcopy photogrammetric use. The raw image was download in the field with XPro to a portable workstation. This enabled a quick look at image quality and coverage. Using the Leica Geosystems IPAS software package the GPS data was differentially processed against a base station. After the differential GPS solution was checked and verified the Leica Geosystems IPAS program was used to compute an integrated GPS/IMU navigation solution at one-second intervals. Using the GPS/IMU trajectory computed by the Leica Geosystems IPAS software and the camera calibration, XPro computed a full x,y,z, omega,phi,kappa exterior orientation of each scan line. Using the orientation data file produced the L0 imagery was resampled. The resampling removes most aircraft motion and provides epipolar geometry imagery for stereo viewing, automated aerotriangulation and automated DEM extraction. The Level 1 epipolar-resampled and georeferenced imagery usually will provide a pixel’s true ground location to within a few pixels without any additional processing. To improve accuracy, a fully automatic aerotriangulation process was performed to minimize the residual errors in the GPS/IMU derived exterior orientations. The aerotriangulation also allowed the introduction of ground control and checkpoints to ensure the accuracy specifications were achieved. Automated aerotriangulation of ADS80 imagery was performed with the Socet Set Automatic Point Measurement (APM) tool. A digital elevation model (DEM) was required for orthophoto production. Iowa Statewide LiDAR Data was used as the DEM for orthophoto creation. Orthophotos were created utilizing Leica Geosystem XPro software. Orthos were created in UTM Zone 15 meters. The orthos were mosaiced together using proprietary image database and mosaicing software. The database was edited for seamlines, and other artifacts. Since the imagery was calibrated by the system calibration no color correcting was done to the imagery. The imagery was clipped out of the database into the sheet layout generated based on client use requirements. In the clipping stage, the coordinate system and georeferencing was embedded into the header of the TIFF file. The imagery tiles were QC'ed and delivered on an External Hard Drive.
Process_Date: 20120930
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Fugro Earthdata Inc.
Contact_Person: Michael Larson
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 3600 Jet Drive
City: Rapid City
State_or_Province: South Dakota
Postal_Code: 57703
Country: United States
Contact_Voice_Telephone: 605-343-0280
Contact_Facsimile_Telephone: 605-343-0305
Contact_Electronic_Mail_Address: mlarson@fugro.com
Hours_of_Service: 8am-5pm Mountain Time
Process_Step:
Process_Description:
Fugro EarthData utilized a XPro workflow for processing the Aerotriangulation for the imagery covering Wahpeton. The airborne GPS data was processed and integrated with the inertial measurement unit (IMU). The resulting imagery and control were imported into the XPro system for use in the aerotriangulation. The ADS40 SH52 imagery was downloaded onto the server and brought over to the XPro system. The ground control was used in conjunction with the processed airborne global positioning system (ABGPS) results for the aerotriangulation. The ground control points were read in all available imagery and tie points between flight lines were selected. A fully analytical bundle adjustment was run. The properly formatted GPro results were used for subsequent processing.
Source_Used_Citation_Abbreviation: Aerotriangulation
Process_Date: 20120930
Source_Produced_Citation_Abbreviation: AT
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Fugro EarthData, Inc.
Contact_Person: Michael Larson
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 3600 Jet Drive
City: Rapid City
State_or_Province: SD
Postal_Code: 57703
Country: USA
Contact_Voice_Telephone: 605-343-0280
Contact_Facsimile_Telephone: 605-343-0305
Contact_Electronic_Mail_Address: mlarson@fugro.com
Hours_of_Service: Mon - Fri 8:00am to 5:00pm Mountain Time
Process_Step:
Process_Description:
KLT Atlas was used in the planimetric feature collection from the ADS40 SH52 imagery acquired over the Wahpeton project area. The imagery along with airborne GPS and IMU data was exported out of XPro in a format usable by KLT Atlas software. The imagery and exterior orientation parameters were brought into KLT Atlas software for 3D collection of the planimetric features. The softcopy technicians used the RGB forward bands and the RGB nadir bands for the stereo viewing of and collection from the imagery. The areas of collection were tiled out into more manageable sizes to accommodate the software and workstation capabilities. The softcopy technician then collected the planimetric features identified on the planimetric list. After the technicians completed collection of the planimetric features, a QC was completed to ensure the thoroughness of the collection This review began by ensuring coverage and then that all features were collected and reside on the appropriate layers in support of the graphics editing process. After the planimetric QC was completed, the graphics edit technicians generated the polygons and polylines that were used to generate the ArcGIS Personal Geodatabase. The ArcGIS File Geodatabase is in ArcGIS Version 9.3.
Source_Used_Citation_Abbreviation: Planimetric Feature Collection
Process_Date: 20121130
Source_Produced_Citation_Abbreviation: Planimetric Features
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Fugro EarthData, Inc.
Contact_Person: Michael Larson
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 3600 Jet Drive
City: Rapid City
State_or_Province: SD
Postal_Code: 57703
Country: USA
Contact_Voice_Telephone: 605-343-0280
Contact_Facsimile_Telephone: 605-343-0305
Contact_Electronic_Mail_Address: mlarson@fugro.com
Hours_of_Service: Mon - Fri 8:00am to 5:00pm Mountain Time
Process_Step:
Process_Description:
LiDAR timed reflection data and the IMU SBET flies were processed together using LiDAR processing software. The data set for each flight line was checked for project area coverage, data gaps between overlapping flightlines, and tension/compression areas (areas where data points are more or less dense that the average project specified post spacing). Using an iterative process that involves analyzing raster difference calculations the omega,phi,kappa angle corrections for the LiDAR instrument were determined. Corrections were applied to the LiDAR data set. Extensive comparisons were made of vertical and horizontal positional differences between points common to two or more LiDAR flight lines. An intensity raster for each flight line was generated and verified that intensity was recorded for each LiDAR point. LiDAR ground points were compared to independently surveyed and positioned ground control points at both the airport bore-sight area and the project area. Based on the results of these comparisons, the LiDAR data was vertically biased to the ground. 1) PRE-PROCESSING STAGE LiDAR, GPS and IMU data are processed together using LiDAR processing software. The LiDAR data set for each flight line is checked for project area coverage and LiDAR post spacing is checked to ensure it meets project specifications. The LiDAR collected at the calibration area is used to correct the rotational, atmospheric, and vertical elevation differences that are inherent to LiDAR data. Intensity rasters are generated to verify that intensity was recorded for each LiDAR point. LiDAR data is transformed to the specified project coordinate system. By utilizing the ground survey data collected at the calibration site and project area, the LiDAR data is vertically biased to the ground. Comparisons between the biased LiDAR data and ground survey data within the project area are evaluated and a final RMSE value is generated to ensure the data meets project specifications. The data set is trimmed to the digital project boundary including an additional buffer zone which is typically about 50 meters (buffer zone assures adequate contour generation from the DEM). The resulting data set is referred to as the raw LiDAR data. 2) SURFACING STAGE The raw LIDAR data is processed through a minimum block mean algorithm and points are classified as either bare earth or non-bare earth. User developed "macros" that factor mean terrain angle and height from the ground are used to determine bare earth point classification. The next phase of the surfacing process is a 2D edit procedure that ensures the accuracy of the automated feature classification. Editors use a combination of LiDAR reflection and tin-editing software to assess points. The LiDAR data is filtered, as necessary, using a quadric error metric to remove redundant points. This method leaves points where there is a change in the slope of surfaces (road ditches) and eliminates points from evenly sloped terrain (flat field) where the points do not affect the surface. The resulting data set is referred to as "bare-earth LiDAR" 3) BREAKLINE COLLECTION Breaklines will be collected on hyrdo features in order to properly define the topography. Breaklines were collected utilizing the stereo imgery collected for ortho production. 4) CREATION OF THE DEM The bare-earth LiDAR surface will be triangulated to form an evenly spaced DEM. -No data voids due to system malfunctions or lack of overlap -Dense vegetation data voids minimized by automatic removal process -instrument calibrated for every mission -flight plans are parallel flight lines with at least one cross flight line to assure positional accuracy. -Flight plan considers requirements for point density, terrain, PDOP, and KP index -All data and products associated with contract deliverables will meet or exceed relevant NMAS standards and full comply with FGDC metadata format standard -Standard coordinates, projections and datums available.
Process_Date: 20121130
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Fugro EarthData, Inc
Contact_Person: Michael Larson
Contact_Position: Project Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 3600 Jet Drive
City: Rapid City
State_or_Province: SD
Postal_Code: 57703
Country: USA
Contact_Voice_Telephone: 605-343-0280
Contact_Facsimile_Telephone: 605-343-0305
Contact_Electronic_Mail_Address: mlarson@fugro.com
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 11600
Column_Count: 11600
Vertical_Count: 3
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: North Dakota State Plane South Zone 3302
Lambert_Conformal_Conic:
Standard_Parallel: 46.183333
Standard_Parallel: 47.483333
Longitude_of_Central_Meridian: -100.500000
Latitude_of_Projection_Origin: +45.666666
False_Easting: 1968500.0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.25
Ordinate_Resolution: 0.25
Planar_Distance_Units: Survey Feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378434.181
Denominator_of_Flattening_Ratio: 298.257222101
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.001
Altitude_Distance_Units: Feet
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
0.25 foot pixel resolution Orthophotography and 1 foot contour interval LiDAR
Entity_and_Attribute_Detail_Citation:
Project was also delivered in MN DOT Watkins County Coordinate System
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: City of Wahpeton
Contact_Person: Randy Nelson
Contact_Position: Public Works Director
Contact_Address:
Address_Type: mailing and physical address
Address: 1900 Fourth Street North
City: Wahpeton
State_or_Province: ND
Postal_Code: 58075
Country: United States
Contact_Voice_Telephone: 701-642-6565
Contact_Electronic_Mail_Address: RandyN@wahpeton.com
Hours_of_Service: 8am-5pm, Central Time
Resource_Description: Iowa County Orthophotography Spring 2012
Distribution_Liability:
In no event shall the creators, custodians, or distributors of this information be liable for any damages arising out of its use (or the inability to use it).
Metadata_Reference_Information:
Metadata_Date: 20121008
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: City of Wahpeton
Contact_Person: Randy Nelson
Contact_Position: Public Works Director
Contact_Address:
Address_Type: mailing and physical address
Address: 1900 Fourth Street North
City: Wahpeton
State_or_Province: ND
Postal_Code: 58075
Country: United States
Contact_Voice_Telephone: 701-642-6565
Contact_Electronic_Mail_Address: RandyN@wahpeton.com
Hours_of_Service: 8am-5pm, Central Time
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Generated by mp version 2.8.11 on Tue Dec 11 10:55:43 2012