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-91b1-7eea55d89593 OfferedBy dd1b2ce7-0722-4642-8cd4-6f885f132777 Copyright © 2004, State of Texas Service National Elevation Mapping Service for Texas 2004-03-01 en -108.44 28.229 -96.223 34.353