National Geospatial-Intelligence Agency (NGA), U.S. Geological Survey (USGS) 2005 remote sensing image An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. For this dataset, the natural color orthoimages were produced at 0.3-meter pixel resolution (approximately 1-foot). The design accuracy is estimated not to exceed 3-meter diagonal RMSE (2.12m RMSE in X or Y). Each orthoimage provides imagery for a 1500-meter by 1500-meter block on the ground. The projected coordinate system is UTM with a NAD83 datum. There is no image overlap been adjacent files. The naming convention is based on the U.S. National Grid (USNG), taking the coordinates of the SW corner of the orthoimage. These data have been created as a result of the need for having geospatial data immediately available and easily accessible in order to enhance the capability of Federal, State, and local emergency responders, as well as plan for homeland security efforts. 20051020 publication date complete irregular -158.193805065 -158.179399676 21.511735996 21.498114179 none 0.3 meter orthoimage rectified image orthophoto natural color orthophoto orthoimage image map U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology. US U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard (FIPS) 5-2): Washington, D.C., National Institute of Standards and Technology. HI None Honolulu, HI none None. Acknowledgment of the National Geospatial-Intelligence Agency (NGA) and the U.S. Geological Survey (USGS) would be appreciated for products derived from these data. This dataset was created in support of the National Geospatial-Intelligence Agency (NGA) and the USGS. The data will support NGA's Homeland Security mission and "The National Map" of the USGS. The following companies produced the data to support this task - 3001, Inc. EarthData International, LLC Zeiss RMK TOP15 Cameras, #13114 and #13256 Z/I Imaging PhotoScan Flatbed Metric Scanner Photo-T Z/I Imaging Orthopro 4.0 OrthoVista Windows NT/2000 Systems ng flight lines when the aerial photographs were taken. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching. Compliance with the accuracy standard was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS data. The elevation data were generated by autocorrelation and manual processes. An RMSE value for each tile was calculated based on the photos utilized in the production of the tile by comparing the AT X and Y coordinates. This value represents an estimate of the accuracy of the horizontal coordinate measurements in the tile expressed in Compliance with the accuracy standard was ensured by the placement of photo identifiable ground control points and the collection of airborne GPS data. The horizontal accuracy of the orthorectified images is mainly determined by the accuracy of the aerotriangulation and digital surface model (DSM). For each rectified image, an RMSE value for all of the standard errors of the tie/pass/control points located in that image and computed by the aerotriangulation solution was calculated. The DSM accuracy assessment was achieved by comparing the rotriangulation-derived elevation with the elevation of the DSM. In addition, visual examination was employed to assess all tiles and its relative edge match. All results were examined for consistency and its compliance with the NSSDA accuracy standard. 0.1655 The horizontal accuracy of the orthorectified images is mainly determined by the accuracy of the aerotriangulation and digital surface model (DSM). For each rectified image, an RMSE value for all of the standard errors of the tie/pass/control points located in that image (lift) and computed by the aerotriangulation solution was calculated. The DSM accuracy assessment was achieved by comparing the aerotriangulation-derived elevation with the elevation of the DSM. In addition, visual examination was employed to assess all tiles and its relative edge match. All results were examined for consistency and its compliance with the NSSDA accuracy standard. EarthData Aviation 2005 29500 Digital 20050413 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050413 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20040818 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20040818 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20040818 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20040818 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20040818 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20040818 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData Aviation 2005 29500 Digital 20050511 gound condition Imagery Digital source imagery for tile production EarthData International, LLC 2005 Digital 20050511 ground condition DSM Used to provide ground elevations for the orthorectification process TerraSurv, Inc. 2005 Digital 20031103 20050609 ground condition GPS ground control The control provides a means for referencing the project source imagery to a geodetic reference frame. kage. 8. Once the orthophotos were inspected and approved for accuracy, the files were copied to the network and downloaded by the orthophoto finishing department. This production unit was responsible for radiometrically correcting the orthophotos prior to completing the mosaicking and clipping of the final tiles. The final 1500-meter X 1500-meter tiles are clipped out and the imagery is output in GeoTIFF format. GeoTIFF files will include the following GeoTIFF tags and keys - - Model Tiepoint Tag - Model Pixel Scale Tag - GT Model Type Geo Key - GT Raster Type Geo Key - Projected CST Type Geo Key - PCS Citation Geo Key - Proj Linear Units Geo Key 9. The processed images were mosaicked using the OrthoVista software. File names were assigned based on the southwest corner of each tile and on the National UTM Grid. 10. The finishing department performed final visual checks for orthophoto image quality. The images were inspected using Adobe Photoshop, which enabled the technician to remove dust and lint from the image files interactively. 11. The final orthophoto images were written out into Arc/Info readable, GeoTIFF format. 20050930 Universal Transverse Mercator 4 0.9996 -159.000000 +00.000000 500000.0 0 row and column 0.3 0.3 meters North American Datum of 1983 Geodetic Reference System 80 6378137 298.2572221 20051020 USGS mailing

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