Post on 19-Dec-2015
transcript
GIS-Data Sources
Francisco Olivera, Ph.D., P.E.Srikanth Koka
Department of Civil EngineeringTexas A&M University
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.
NCRSNRCS: National Resources Conservation Service
STATGO: State Soil Geographic Database
http://www.ftw.nrcs.usda.gov/stat_data.htmlScale: 1:250,000
SSURGO: Soil Survey Geographic Database
http://www.ftw.nrcs.usda.gov/ssur_data.htmlMore detailed than STATSGOScale: Between 1:12,000 and 1:63,360
USGS
http://seamless.usgs.gov/viewer.htm
Resolution: 30 m
Available datasets
NED: National Elevation Dataset (30 m)
NLCD: National Land Cover Dataset (1992, 2001)
USGShttp://nhd.usgs.gov/
NHD: National Hydrographic Dataset
Vector data containing surface water features like streams, lakes, ponds, springs, etc.
Scale: 1:100,000
USGShttp://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)
BTShttp://www.bts.gov/gis/ntatlas/networks.html
Available dataNational ParksState BoundariesAirportsAmtrak StationsU.S. Army Corps of Engineers Ports U.S. Corps of Engineers Navigable Waterway Nodes Hydrographic Features metadataNational Highway Planning NetworkRailway Network U.S. Corps of Engineers Navigable Waterway Network
TCEQ
http://www.tceq.state.tx.us/index.html
Available Data:Digital raster graphs (DRGs)Monitoring sitesPermit sitesWaste sites
TNRIS
http://www.tnris.state.tx.us/digital.htm
Available Data:
RoadsHydrographyVegetationDOQQsCounty boundaries
TWDBhttp://www.twdb.state.tx.us/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
GLOhttp://www.glo.state.tx.us/gis/
Available Data (for Texas):County boundariesHydrographyRoadsPlaces, names and populationsShorelinesUrban areasCity BoundariesVegetation areasEnergy resource dataOil and Gas pipeline Coastal/Oil Spill Response data Coastal management program data, etc.
http://edcdaac.usgs.gov/gtopo30/hydro/
Hydrologic Datasets for the whole world
Resolution: 30 arc-second (1 km)
Datasets:Raster: DEM, Flow direction, Flow Accumulation, Slope, Aspect, Compound topographic indexVector: Streams, Drainage basins
USGS
ESRIhttp://arcdata.esri.com/data/tiger2000/tiger_download.cfm
Available data:CensusCongressional districtsLand marksHydrographyRailsRoads
USGShttp://waterdata.usgs.gov/nwis
Real time and historic data for:
Surface waterGround waterWater quality