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Data format: SDE Raster Dataset File or table name: IMAGES.DBO.VOL2006 Coordinate system: Transverse Mercator Theme keywords: digital, terrain, model, breakline, LiDAR |
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Abstract:
2006, 6 inch Pixel Color Orthophotography - -
Panchromatic, red, green, blue and near infrared imagery was acquired using the Leica ADS40 multi-spectral scanner (see Appendix B: Aerial Imagery and Ground Control Layout). The imagery was captured from an altitude of 6,336' AGL, providing a raw ground sample distance of 0.66-feet. A total of 60 flight lines of imagery (see Appendix B: Aerial Imagery and Ground Control Layout) were acquired over 5 sessions conducted between February 14 and March 15, 2006 (see Aerial Triangulation Report, 2006 Volusia Countywide DOI Project, Dated December 2006).
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This data set is one component of a digital terrain model (DTM) developed for Volusia County, Florida in 2006 under contract number RSQ 06-SQ-06RB, project number P5409, Professional Consuting Services for LiDAR Surveys, Digital Topographic Data and Digital Orthophotography. As part of the 2006 Task Assignment 1, LiDAR and digtial color imagery data was acquired across the county, +/-1,427 square miles. The digital imagery was used to develop orthophotos over the entire county, and it was used to support DTM development (QC of LiDAR data and breakline compilation) over 3 drainage basins: Spruce Creek, Deland Ridge and Deep Creek Closed, totaling 361 county grid tiles at 5,000' by 5,000' or 323.7 square miles. The LiDAR data was used to develop a DEM for orthophoto rectification purposes only, and it was used to support DTM development.
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Aerial Triangulation - -
Aerial triangulation was performed to extend or densify the network of control points established by the ground control survey. Aerial triangulation provides the proper number and pattern of control points for each stereo model derived from the imagery strips. This data is necessary to orient the imagery to the ground for the QC of LiDAR data and the rectification of raster images. For a detailed overview of the aerial triangulation, refer to: Woolpert Aerial Triangulation Report, 2006 Volusia Countywide DOI Project, dated December 2006.
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Digital Orthophoto Imagery (DOI) - -
Color (RGB) DOI was developed by rectifying the digital aerial imagery to correct for aircraft tilt, terrain relief, and camera lens distortion. Overlapping nadir images were derived from the triangulated flight lines. Full differential rectification was then performed on each derived image using the Z/I Imaging Corporation Base Rectifier software. Image mosaicking was performed between adjacent rectified images using OrthoVista software, version 3.3.0, developed by Stellacore Corporation of Parker, Colorado, and distributed by Inpho of Estes Park, Colorado. Processing for orthorectification and image mosaicking was performed on photogrammetric workstations.
After rectifying all of the digital aerial imagery, a controlled mosaic was developed from the individual digital orthophotography images to create a continuous base map. Orthorectification and mosaicking were performed at a 0.5-foot pixel resolution. One-thousand five hundred and ninety-one (1,591) individual image tiles were extracted from the mosaic based on the county's 5,000' by 5,000' tile system. For each image tile, an ArcINFO world file was generated to georeference the DOI within the ArcINFO environment.
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Accuracy Checks - -
The horizontal accuracy of the DOI was field verified and the results of those field verifications are included in Appendix F: DOI Accuracy Analysis.
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References - -
http://rockyweb.cr.usgs.gov/nmpstds/nmas.htm - UGSG Internet Site for National Map Accuracy Standards
Woolpert MTS Report of Photogrammetric Ground Control Survey:
LiDAR Surveys, Digital Topographic Data and Digital Orthophotograph,
2006 Volusia County Project No. P-5409 - Task Order 1
April 26, 2006.
Woolpert Aerial Triangulation Report, 2006 Volusia Countywide DOI Project, dated December 2006 |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
2006, 6 inch Pixel Color Orthophotography - - Panchromatic, red, green, blue and near infrared imagery was acquired using the Leica ADS40 multi-spectral scanner (see Appendix B: Aerial Imagery and Ground Control Layout). The imagery was captured from an altitude of 6,336' AGL, providing a raw ground sample distance of 0.66-feet. A total of 60 flight lines of imagery (see Appendix B: Aerial Imagery and Ground Control Layout) were acquired over 5 sessions conducted between February 14 and March 15, 2006 (see Aerial Triangulation Report, 2006 Volusia Countywide DOI Project, Dated December 2006). ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### This data set is one component of a digital terrain model (DTM) developed for Volusia County, Florida in 2006 under contract number RSQ 06-SQ-06RB, project number P5409, Professional Consuting Services for LiDAR Surveys, Digital Topographic Data and Digital Orthophotography. As part of the 2006 Task Assignment 1, LiDAR and digtial color imagery data was acquired across the county, +/-1,427 square miles. The digital imagery was used to develop orthophotos over the entire county, and it was used to support DTM development (QC of LiDAR data and breakline compilation) over 3 drainage basins: Spruce Creek, Deland Ridge and Deep Creek Closed, totaling 361 county grid tiles at 5,000' by 5,000' or 323.7 square miles. The LiDAR data was used to develop a DEM for orthophoto rectification purposes only, and it was used to support DTM development. ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### Aerial Triangulation - - Aerial triangulation was performed to extend or densify the network of control points established by the ground control survey. Aerial triangulation provides the proper number and pattern of control points for each stereo model derived from the imagery strips. This data is necessary to orient the imagery to the ground for the QC of LiDAR data and the rectification of raster images. For a detailed overview of the aerial triangulation, refer to: Woolpert Aerial Triangulation Report, 2006 Volusia Countywide DOI Project, dated December 2006. ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### Digital Orthophoto Imagery (DOI) - - Color (RGB) DOI was developed by rectifying the digital aerial imagery to correct for aircraft tilt, terrain relief, and camera lens distortion. Overlapping nadir images were derived from the triangulated flight lines. Full differential rectification was then performed on each derived image using the Z/I Imaging Corporation Base Rectifier software. Image mosaicking was performed between adjacent rectified images using OrthoVista software, version 3.3.0, developed by Stellacore Corporation of Parker, Colorado, and distributed by Inpho of Estes Park, Colorado. Processing for orthorectification and image mosaicking was performed on photogrammetric workstations. After rectifying all of the digital aerial imagery, a controlled mosaic was developed from the individual digital orthophotography images to create a continuous base map. Orthorectification and mosaicking were performed at a 0.5-foot pixel resolution. One-thousand five hundred and ninety-one (1,591) individual image tiles were extracted from the mosaic based on the county's 5,000' by 5,000' tile system. For each image tile, an ArcINFO world file was generated to georeference the DOI within the ArcINFO environment. ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### Accuracy Checks - - The horizontal accuracy of the DOI was field verified and the results of those field verifications are included in Appendix F: DOI Accuracy Analysis. ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### References - - http://rockyweb.cr.usgs.gov/nmpstds/nmas.htm - UGSG Internet Site for National Map Accuracy Standards Woolpert MTS Report of Photogrammetric Ground Control Survey: LiDAR Surveys, Digital Topographic Data and Digital Orthophotograph, 2006 Volusia County Project No. P-5409 - Task Order 1 April 26, 2006. Woolpert Aerial Triangulation Report, 2006 Volusia Countywide DOI Project, dated December 2006
The DTM was developed to support the County of Volusia Public Works Department's regulatory, land management and acquisition, planning, engineering, and habitat restoration projects.
Project Title: Contract for Professional Consulting Services LiDAR Surveys, Digital Topographic Data and Digital Orthophotography Reports 2006. Purchase Order: 06-SQ-06RB Task Assignment 1 Project Number P-5409 Vendor Name: Woolpert, Inc.
date of collection
This data is not valid without the signed and sealed Florida MTS Report of Specific Purpose Survey, 2006/2007 Volusia County LiDAR DTM Project, dated June 2007. Please refer to this document for use constraints.
123 West Indiana Avenue, 4th Floor
Monday - Friday
The LiDAR DTM was developed in accordance with the 2006 Volusia LiDAR specifications. The DTM is intended to support 2-foot contours, and the vertical accuracy of ground points in unobscured areas is 0.3-feet RMSE.
Horizontal accuracy is consistent with 1"=100' mapping per FY2006 Digital Orthophotos and LiDAR.
see MTS Report of Specific Purpose Survey, 2006/2007 Volusia County LiDAR DTM Project, dated June 2007.
0.3-feet RMSE for unobscured ground points
see MTS Report of Specific Purpose Survey, 2007 Volusia County LiDAR DTM Project, dated June 2007.
The LiDAR data was acquired using a Leica ALS50 from an altitude of 3,281' above ground level to provide a nominal ground sample distance of 3.3-feet. The scanner field of view was 42-degrees, and the scan rate was 33-hertz. First and last return data was collected along with the signal return intensity. A total of 141 flights of LiDAR data were acquired. Flight lines were flown with a 30% sidelap, providing a line-to-line swath width of 1,763-feet. Ten (10) airborne GPS base station locations were utilized across the county with as minimum of two redundant airborne GPS bases stations in operation during any data acquisition with maximum line-of-sight distance between the base station and aircraft of 30-km. The LiDAR data was reduced using Grafnav (Waypoint Consulting) for GPS post-processing, PosProc (Applanix Crop) for IMU processing, ALS50 Post Processor (LH Systems) to initial LiDAR processing, TerraScan (Terrasolid) for initial point classification, and proprietary Woolpert developed software for refining the point classification and QC. For a complete description of survey methods, processing methods, software, system parameters, and accuracy analysis, see the Florida MTS Report of Specific Purpose Survey, 2006/2007 Volusia County LiDAR DTM Project, dated June 2007.
11315 Corporate Blvd., Suite 115
Monday-Friday
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123 West Indiana Avenue, 4th Floor
Monday - Friday
123 West Indiana Avenue, 4th Floor
Monday - Friday