Information about raster GIS datasets used at TCEQ including aerial imagery (DOQQs) and Digital USGS Topographic Maps (DRGs).
Topics Under This Category:
DOQQ Sample Displays a sample graphic of a DOQQ (aerial image of Mission Bay)
Digital Raster Graphics (DRGs) Describes DRGs, which are scanned images of U.S. Geological Survey (USGS) topographic maps.
Mission Bay SE DOQQ Map graphic showing location of the DOQQ sample.
TCEQ Digital Orthophoto Quarter Describes TCEQ's 1995 DOQQ (aerial imagery) Acquisition Project
TCEQ Digital Orthophoto Quarter Quads Numbering Conventions Demonstrates the USGS Quarter Quad Numbering System.