In this blog and in our book, we have reviewed many geospatial data portals. One of the oldest and yet most useful of all regional or state portals is that of the Texas Natural Resources Information System, or TNRIS. Indeed, TNRIS predated digital spatial data, for it was founded in 1968, housing paper topographic and geologic maps and aerial photographs for years before hosting digital spatial data. TNRIS allows searches by county or by data theme. If one zooms in on a the statewide map with county boundaries, the familiar USGS 7.5-minute grid is displayed, from which one can download such data as digital raster graphics, elevation, wetlands, geology, and historical and current satellite imagery. Statewide themes include bathymetry, land cover, soils, census data, transportation, and many others. Metadata is not only available but it is conveniently packaged, and the site doesn’t burden the data user with needless frills and fancy ways to download–it is, in my view, what a data portal should be–with the ability to quickly go in and get what one needs, in a variety of formats.
As GIS technologies have evolved, the TNRIS portal has evolved as well. One of the most innovative and useful sections of their site is its online mapping services. Here, high resolution imagery (30 cm in many places), land cover, and other themes are hosted as ArcGIS services and OGC WMS services. The site conveniently enables the data user to preview the services on their website or to copy the URL for the service so that it may be used in ArcGIS Online. Therefore, not everything from TNRIS needs to be downloaded–a growing amount can be streamed.
Texas is an excellent location for other useful data portals as well: The General Land Office hosts data on habitat, minerals, oil and gas, and other themes. The Texas Commission on Environmental Quality hosts data on air and water quality, toxic hazards, and other layers. Texas Parks and Wildlife hosts data on bays, ecosystems, trails, and wildlife management areas. And other gems exist, such as the railroads and other data hosted by Entergy on the Texas Site Selection Center.
A section of the Texas Natural Resources Information Systems geospatial data portal.