U.S. Geological Survey State of Texas U.S. Geological Survey Elevation, Hypsography, and Contours elevation Elevation data collected for the National Elevation Dataset (NED) based on 30m horizontal and 15m vertical accuracy. AC522EF2-89A6-11DB-91B1-7EEA55D89593f264-77d2-09ce-aa39-f0f0 g h i j Service National Elevation Mapping Service for Texas 2004-03-01 -108.44 28.229 -96.223 34.353