Title: ADS40 Hurricane Response 7.5' Quadrangle Mosaics
Originator:
Abstract:
This dataset includes a series of
quadrangle (quad) based image files that were created from a collection of GeoTIFF format natural color image tiles covering regions
of
The raw imagery used to generate the original image tiles was simultaneously collected with airborne Global Positioning System (GPS) and Inertial Measurement Unit (IMU) data, which was used to georeference the raw imagery. The raw imagery was rectified to a plane of constant elevation and mosaiced to generate the final image tiles. Each original image tile provided data for a nominal 1.875 minute (in latitude and longitude) cell area. The source imagery was obtained in September 2005 and was used to produce georeferenced, planar rectified imagery with a 1 ft. ground resolution. Imagery was acquired at 1 ft. Ground Sample Distance (GSD) resolution. Flight height maintained during mission was 10,000 ft. Above Ground Level (AGL). The imagery was captured at 12-bit radiometric resolution and converted to 8-bit radiometric resolution during post processing. The imagery was obtained and processed by all digital means beginning with data acquisition using an ADS40 digital airborne sensor.
The individual 1.875 minute image tiles were provided in GeoTIFF format in Geographic Coordinates (decimal degrees), NAD83. The 1.875 minute cell area GeoTIFFS were merged into 7.5 minute quad based mosaics and compressed on a Solaris system using LizardTech GeoExpress verion 5.0.6 software applying a compression ratio (cr) or 8:1 in a batch process without any enhancements or adjustments. It was determined that mosaics would be created for all quads in the project even when only a few of the sixteen 1.875 minute GeoTiffs required for complete quadrangle coverage of a particular quad were available. As a result, some of the quad mosaics in this dataset do not contain full 7.5 minute image coverage.
Format: Raster - MrSID compression, with mosaic option, was used on U.S. Army Corps of Engineers sixteenth quadrangles.
Spatial Reference Information: Decimal degrees, North American Datum of 1983
