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Q18: Do you have a description of the CTG format?
The Composite Theme Grid (CTG) format involves representing data in raster
or grid cell form for a given quadrangle. The CTG files are sequential and
consist of fixed length records (except for header files) with one grid
cell for each logical record.
The grid cells are actually a regular point
sample of the quad where the center point of each cell is 200 meters apart from
other center points in adjacent cells. The cells are mapped to the UTM
projection and oriented in the north-south, east-west directions.
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