NYS Cyber Security Spring 2006 remote-sensing image NYS Digital Orthoimagery Program (NYSDOP) NYS CSCIC These files contain 2005 digital orthoimagery of Erie County, New York. Image pixel size is 2 ft. GSD. Image type is Panchromatic. Image horizontal accuracy is +/-8 ft. at the 95% confidence level. Each file contains an image covering 6000 ft. by 4000 ft. on the ground. This digital orthoimagery can serve a variety of purposes, from general planning to field reference for spatial analysis to a tool for revision of vector maps. It can also serve as a reference layer for GIS. Digital elevation models used for orthorectification were compiled from several sources, all of which were compiled photogrammetrically. en April 2005 ground condition Complete Irregular -79.153611 -78.457105 43.106802 42.424916 996000.000000 1182000.000000 884000.000000 1132000.000000 Orthophoto, ortho Digital orthoimagery Some imagery tiles are classified as sensitive due to their content. These sensitive imagery tiles have been reprocessed to reduce the clarity of sensitive features. Non-sensitive content on these tiles is unaltered. Only the re-processed versions of sensitive tiles are made openly available to the public. A separate procedure is available for requesting original, full resolution versions of these tiles. Use of sensitive imagery, if granted, is only for the use specified in the request. Tim Ruhren NYS Cyber Security NYS GIS Clearinghouse mailing and physical address

30 South Pearl Street

Albany New York 12207-3425 USA 518-474-5212 518-473-5848 nysgis@dhses.ny.gov NYS Cyber Security TIFF images scanned on a Z/I high-resolution photoscanner.sid +/-8 ft. at the 95% confidence level (NSSDA) Not applicable. 1:28,800 scale aerial photography with airborne GPS was acquired April 9 to May 24, 2005 with a Zeiss RMK TOP 15 Camera and a Wild RC-20 aerial camera system equipped with six focal length lens. The imagery was scanned at 14 microns directly from the aerial negatives. The aero triangulation process utilized an airborne gps survey undertaken during the flight to provided geodetic coordinates and elevation of photo centers. Also, image targeted ground control points where visible on the 2005 aerial flight and were used as control. Aerial triangulation was performed using softcopy workstations and Mira Solutions AT bundle adjustment program, Mira-AT. Details of the aerial triangulation process can be found in the Erie County, New York 2005 Orthophoto Update Project Aerial Triangulation Report. For the 2002 orthophoto project only minimum DTM was collected in the center area of each aerial photo model creating an uneven distribution of terrain data throughout the project area. This process created what has been called "donut-holes" in the DTM and limited the usefulness of the data set for future ortho photo projects and other applications for this level of DTM. The 2005 project requirement was to fill in these sparse areas of DTM to create a consistent pattern digital terrain points throughout the project area. This was done by using a softcopy workstation with the AMSA-Softcopy program, overlaying the existing DTM on the stereo model and then adding points or breaklines to create a uniform level of digital terrain data. During this process the aerial photography was inspected for new roads and bridges that required collection of a bridge polygon that was used to correct the shape of the bridge during the orthophoto process. The photo inspection was assisted by information provided by Erie County as to the location of new roadways since 2002. The images were then ortho rectified using Mira Solutions Mira Ortho software. Mira Solutions Mira Mosaic program was used for the mosaicking, color balancing and tiling of the imagery. The Mira Solutions process produced the same effect for bridges as was required to meet the previous ortho photo project. Quality control was maintained throughout the process using internal QA programs within the Mira Solutions suite of orthophoto production software. Final files were then compressed using MrSID. Final deliverables in TIFF format with TFW files and MrSID files where placed on DVD Media. <1% The dataset contains raster or digital ortho images so the logical consitency report is not applicable. The file naming convention was supplied by New York state and is based on the co-ordinate pair of the lower left corner of the ortho tile. When the ortho tiles were created the file names were restricted to a numeric value representing the lower left corner of the ortho tile. 10470162 represents a tile with the lower left corner of 1047000, 162000. These tiles were then all renamed using a batch script so that they reflected the N.Y. state standard W_10470162_24_14400_pan_2005.tif Consistency of file naming was ensured by the batch process. The project consisted of 841 final tiles Raster Pixel 4000 6000 1 pixel codesUpper Left32.0000002.0000008TRUE MrSIDFALSEWavelet GCS_North_American_1983 NAD_1983_StatePlane_New_York_West_FIPS_3103_Feet row and column survey feet 2.000000 2.000000 State Plane Coordinate System 1983 3103 0.999900 -74.500000 38.833333 492125.000000 0.000000 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 597 597 20041001 NYS CSCIC Tim Ruhren mailing and physical address

30 South Pearl Street

Albany New York 12207-3425 USA 518-474-5212 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time ESRI Metadata Profile 2003093008562600TRUE2003093008133100{98DA2119-79DB-4584-B0DE-E972326CCE47}20030930