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Image pixel size is 0.5 ft GSD. Image type is Natural Color. Image horizontal accuracy is within 2 ft. at the 95% confidence level (NSSDA). Each file contains an image covering 3000 ft. by 2000 ft. on the ground.</SPAN></P></DIV></DIV></DIV>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.NYS Cyber Security and Critical Infrastructure CoordinationTim RuhrenNYS Cyber Security and Critical Infrastructure CoordinationNYS GIS Clearinghouse518-474-5212518-473-584830 South Pearl StreetAlbanyNew York12207-3425USnysgis@cscic.state.ny.usOrtho-photo, OrthoDigital Ortho-imageryDigital OrthophotographyNassau CountyNew York State2007Some 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. Please contact CSCIC for more information on these criteria.<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Use of sensitive imagery, if granted, is only for the use specified in the request.</SPAN></P></DIV></DIV></DIV>ground conditionThe dataset contains raster images or digital ortho images so the logical consistency report is not applicable. The file naming convention was supplied by New York State. When the ortho tiles were created the file names were restricted to a numeric value representing the lower left corner of the ortho tile. These tiles were then all renamed using a batch script so that they reflected the N.Y. state standard (i.e. "l_10530252_06_04800_col_2007.tif"). Consistency of file naming was ensured by using a batch process. The file naming convention consists of the first letter for Central, East, West or Long Island for New York State Plane Coordinate Systems (NYSPCS). The following four numeric characters represent the first four characters of the "X" coordinate value for the tile's lower left corner coordinate in NYSPCS and the next four characters represent the first four characters of the "Y" coordinate value for the tile's lower left corner coordinate in NYSPCS. The next two numeric characters represent the tile's Ground Sampling Distance (GSD) value in ft. The following five numeric characters represent the Above Mean Terrain (AMT) nominal height at which the DMC sensor recorded or collected the original imagery for the corresponding area. The next three characters are "col" for Digital Natural Color ortho-photos and "cir" for Digital Color Infrared ortho-photos. Lastly, the last four numeric digits represent the year in which the particular ortho was created.The project consisted of 1,587 ortho tiles tiles.The Digital Natural Color aerial imagery was acquired in spring 2007 using a DMC sensor flown at a nominal height of 4800 feet AMT (Above Mean Terrain). ABGPS data was also collected to supplement New York State CORS data. High level photography was collected at a nominal height of 20,000 ft AMT, to tie the disjoining smaller islands on the low level photography with the main land. The Ground Control used to support the Digital Natural Color Ortho-imagery production was collected by identifying strategic points on previous aerial photography and supplemented by selecting new points or photo identifiable points (PID) in areas where needed due to a lack or minimal existence of points from previous Ortho-imagery production projects and then determining the precise location coordinates of the entire ground control network by using ground survey techniques. The new Ground Control Network was also supplemented by targeting existing New York State HARN stations data. The Digital Aerial Triangulation (DAT) was performed, primarily, using softcopy workstations and Intergraph's ISPM / ISAT software or BINGO where applicable. DAT solutions were independently reviewed and checked using independent blind control points. Digital Elevation Models (DEM) (mass-points and break-lines) used to support ortho imagery production were updated from the existing terrain data from year 2004 using standard pothogrammetric collection techniques on Intergraph's SSK soft copy workstations. The images were then ortho-rectified using Intergraph's OrthoPro software. Radiometric adjustment for the ortho rectified images was performed using both Intergraph's OrthoPro software and Orthovista. Seamless mosaicking was performed by automatic and manual seam line creation using Intergraph's Orthopro & IRASC software and then importing them into OrthoPro for mosaicking. Images were then color balanced again in order to match adjacent counties projects and quality controlled using Intergraph's IRASC, OrthoPro and Adobe PhotoShop software. The seamless mosaic was clipped into tiles using OrthoPro software. The imagery product deliverables are GeoTIFF images with embedded header information describing the required projection, pixel size, tile size and other related data and corresponding world files (.tfw). Final files were then compressed to JPG2000 files (.jp2) with corresponding world files (.j2w) at a compression ratio of 20:1 using Lizard Techs GeoExpress v6.0 software. All .jp2's require MapInfo .tab files.Nassau County Digital Ortho (Natural Color) - 6"Raster Image1587