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Q1: Where can I find a digital file of the USGS quad grids?
The USGS digital quad grids for the 1:24000, 1:100000 and 1:250000 in a ArcView Shapefile format, can be found by following the addresses below:
USGS 24k quad map
USGS 100k quad map
USGS 250k quad map
The grids are in a Lambert Azimuthal Projection with the following content:
| units |
meters |
| major axis |
6370997.00000 |
| minor axis |
0.00000 |
| radius of the sphere of reference |
6370997.00000 |
| longitude of center of projection |
-100 0 0.00000 |
| latitude of center of projection |
45 0 0.00000 |
| false easting |
0.00000 |
| false northing |
0.00000 |
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