Notes on Use: | Due to the large amount of data involved, all files are archived and compressed into a single zip file for easy downloading. Single-precision coverages can store up to seven significant digits for each coordinate, double-precision coverages up to fifteen significant digits. |
| File Type | Extension | Name | | Vector | | | ArcView Shapefiles (*.shp, *.shx, *.dbf) | | Arc/Info Export files | | USGS DLG Optional |
| | Image | | .tif/.tfw | | *.tif | | *.img | | INFO folder |
| | TIFF (Tag Image File Format / World File) | | GeoTIFF (TIFF with Geo header) | | IMAGINE (ERDAS IMAGINE) | | ArcInfo GRID (ESRI Grid File) |
| | Compression | | | MrSID (Multiresolution Seamless Image Database) | | Zip files (.zip) |
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