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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: LULC Composite Theme Grid |
| Date: |
03/06/2002 05:40:12 PM |
| From: |
Andrew Hunter |
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Hi
Does anybody have or know where the standard for the USGS LULC CTG data can
be obtained from. I have searched the USGS sites but can only find the
following description.
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, oriented in the north-south,
east-west directions and sequenced by row from north to south, within each
row, by column east to west.
It's a start but I need more specific details about the file structure.
Thanks
Andrew Hunter
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