DEM Data Sources for Texas
Digital terrain models with 2’ or 4’ contours built from aerial photogrammetry
10m DE-DEMs, from 1:24,000 scale maps with drainage enforcement (experimental)
30m DEMs from 1:24,000 scale maps
1” seamless DEM of Texas (March, 1999)
3" (100m) DEMs from 1:250,000 scale maps (current state-wide coverage)