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The USA Select product is a statewide tonal balanced, 30’x30’ SPOTView product designed to be load-n-go into GIS and image processing systems. The source imagery is SPOT PAN 10 m data.
SCENE SELECTION:
The most current imagery was preferred. Fall/Winter/Spring (leaf-off) scenes were preferred, but summer (leaf-on) imagery was used if scene gaps were present.
SCENE DATABASE:
The “SCENETM” ARC/VIEW shape file provided includes detailed information of the SPOT PAN scenes that were processed to create the final product.
FRAMES:
The dataset is provided as 30-minute x 30-minute frames. These frames were defined as quadrants of the USGS 1 deg. x 1 deg. grid and were produced for all 30'x30' cells which intersect with the state boundary. Data file names were composed as follows: The 1st 3 digits refer to the Latitude and the 4rd-7th digits to the Longitude of the lower right corner of the 1 deg. by 1 deg. block in which it belongs. The 8th digit is the 30'x30' tile number as determined by the tile’s position in the 1 deg. x 1 deg. block. Tile 1 is in the upper left, tile 2 in the upper right, tile 3 in the lower left, tile 4 in the lower right.
FILE FORMATS:
Files are in GEOSPOT VERSION 4.1 format. File format consists of these files:
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framename.TIF – This is the imagery file, imagery is in GEOTIFF untiled format. This file is compliant with the TIFF version 6 specifications issued by Aldus/Adobe Corporation in June 1992. Contains the georeferencing tags compliant with the GeoTIFF specification 1.0 issued by NASA Jet Propulsion Laboratory in September, 1995.
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ASCII .DSC File - lists all files on media
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ASCII .REP File - the first file of each product is the Geospot Report File. It has the same name as the product and describes the content of the product it belongs to: product general information, structure definition (numbering and names of files), cartographic parameters and framing information.
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ASCII .HDR File - all pertinent georeferencing information for the image data including file sizes in pixels (columns) and lines (rows), pixel size, and map coordinates for georeferencing the upper left corner of the image file.
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ASCII .CLR File - prescribed standard lookup table for image display. Use of this file is optional. This file can also be used for pseudo-coloring an image or thematic map.
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ASCII .RSC File - the Raster Source Description File provides information about the sources of the raster file (origin, sensors…)
SOFTWARE REQUIREMENTS:
The dataset requires a software package capable of loading and displaying SPOTView raster images. Most major GIS (Geographic Information Systems) and IP (Image Processing) software that work in the geographic domain are capable of loading, translating, and ingesting SPOTView data.
PROJECTION INFORMATION:
Data are available in:
ACCURACY:
The provide dataset follows our SPOTView specifications for positional (horizontal) accuracy of 12 meters or better with 90% confidence.
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