1. GIS-Data Sources Francisco Olivera, Ph.D., P.E. Srikanth Koka Department of Civil Engineering Texas A&M University

2. Introduction It is important to know what data is needed, what format is preferred and where it can be found. Different agencies develop and/or make available digital spatial data.

3. NCRS NRCS: National Resources Conservation Service STATGO: State Soil Geographic Database http://www.ftw.nrcs.usda.gov/stat_dat a.html Scale: 1:250,000 SSURGO: Soil Survey Geographic Database http://www.ftw.nrcs.usda.gov/ssur_dat a.html More detailed than STATSGO Scale: Between 1:12,000 and 1:63,360

4. USGS http://seamless.usgs.gov/vi ewer.htm Resolution: 30 m Available datasets NED: National Elevation Dataset (30 m) NLCD: National Land Cover Dataset (1992, 2001)

5. USGS http://nhd.usgs.gov/ NHD: National Hydrographic Dataset Vector data containing surface water features like streams, lakes, ponds, springs, etc. Scale: 1:100,000

6. USGS http://water.usgs.gov/lookup /getspatial?huc250k HUC: Hydrologic Unit Codes Vector data containing drainage areas Four levels of classification: Regions (2-digit code) Sub-regions (4-digit code) Accounting units (6-digit code) Cataloging units (8-digit code)

7. BTS http://www.bts.gov/gis/ntatlas/ networks.html Available data National Parks State Boundaries Airports Amtrak Stations U.S. Army Corps of Engineers Ports U.S. Corps of Engineers Navigable Waterway Nodes Hydrographic Features metadata National Highway Planning Network Railway Network U.S. Corps of Engineers Navigable Waterway Network

8. TCEQ http://www.tceq.state.tx.us/index.html Available Data: Digital raster graphs (DRGs) Monitoring sites Permit sites Waste sites

9. TNRIS http://www.tnris.state.tx. us/digital.htm Available Data : Roads Hydrography Vegetation DOQQs County boundaries

10. TWDB http://www.twdb.state.tx.u s/mapping/gisdata.htm Available Data: NATURAL FEATURES Aquifers River Basins HUCs Major Basins Texas Precipitation ADMINISTRATIVE Ground water conservation districts Regional water planning areas River authorities Counties

11. GLO http://www.glo.state.tx.us/g is/ Available Data (for Texas): County boundaries Hydrography Roads Places, names and populations Shorelines Urban areas City Boundaries Vegetation areas Energy resource data Oil and Gas pipeline Coastal/Oil Spill Response data Coastal management program data, etc.

12. http://edcdaac.usgs.gov/gtopo3 0/hydro/ Hydrologic Datasets for the whole world Resolution: 30 arc-second (1 km) Datasets: Raster: DEM, Flow direction, Flow Accumulation, Slope, Aspect, Compound topographic index Vector: Streams, Drainage basins USGS

13. NASA http://www.nasa.gov/hom e/index.html Available Data: Remotely Sensed Meteorological Data

14. ESRI http://arcdata.esri.com/ data/tiger2000/tiger_do wnload.cfm Available data: Census Congressional districts Land marks Hydrography Rails Roads

15. NCDC http://www.ncdc.noaa.g ov/oa/ncdc.html Available Data: Precipitation Temperature Wind

16. USGS http://waterdata.usgs.g ov/nwis Real time and historic data for: Surface water Ground water Water quality

17. Other Sources http://data.geocomm.com /catalog/US/index.html 10 m resolution DEM Available only for some areas