Maps & Data
Geographic Information of TexasTNRIS archives, maintains, and distributes the largest collection of current and historical spatial geographic data sets for the State of Texas. Our collection of maps, photos, documents and other spatial datasets have been acquired over time from multiple sources including state, federal, and local agencies with support and donations from private sources. Much of our digital data can be accessed and downloaded online. For assistance with other data products and services, contact us or use our convenient order form to request products or services.
Research and Distribution Services
TNRIS offers a variety of additional products, support and services from our in-house staff including:
- Comprehensive digital imagery searches (Aerial imagery, and Satellite Imagery)
- Statewide collection and distributions of USGS topographic, USFWS wetlands, and FEMA Flood Insurance Rate maps
- Current map duplication and distribution including USGS, FEMA, US Fish and Wildlife Service National Wetland Inventory maps
- Historic map and photo searches and/or reproduction
- Limited custom mapping using TNRIS digital aerial photographic datasets.
- Digital data distribution on CD, DVD, and external hard drives
- Staff assistance in locating natural resource information and related data or information provided through other agencies
- Staff assistance in accessing bulk data acquisitions
- Training assistance for anyone interested in using TNRIS data for work or research
- Texas Water Development Board (TWDB) Publications
For any assistance or to request additional services, please contact us.
- Compressed County Mosaics (CCM)
- Digital Ortho Quadrangle (DOQQ)
- Digital Raster Graphics (DRG)
Download here >>
New bathymetry of the Texas-Louisiana Continental Shelf was compiled in a project carried out in 2004 - 2006 sponsored by the Texas Sea Grant College Program. The objective of this project was to provide for the first time new bathymetry as good as the available underlying historical U. S. Coast Survey bathymetric survey data.Download here >>
The Original Texas Land Survey (OTLS) is an interpretation of the Original Texas Land Surveys boundaries and bay tracts. The dataset was derived from the Texas General Land Office (GLO) county maps, the GLO Abstract of Original Land Titles: Volumes and Supplements, and the GLO maps of State-Owned Submerged Lands of the Texas Gulf Coast (bay tracts). The OTLS was generated by the Texas Railroad Commission. The Patent Survey lines from the Texas General Land Office (GLO) maps are interpreted against the USGS 7.5 minute quadrangle maps to create the OTLS layer. The OTLS is continually updated and refined by the RRC.Download here >>
The StratMap political boundary dataset contains political jurisdictions, state boundaries, county boundaries, city boundaries, federal parks, state parks, and landmark boundaries (airports, universities, wildlife refuges, and military bases). StratMap Boundaries are useful in right-of-way determination, highway planning and maintenance, real estate, public services, jurisdiction maintenance, and numerous administrative assignments. Each of the boundary datasets are derived from various sources such as the Texas Department of Transportation, Texas Parks and Wildlife, and local jurisdictions to create the most comprehensive datasets available.Download here >>
NAIP imagery is available as quarter quadrangle tiles or as compressed county mosaics. The mosaics are generated by compressing digital quarter quadrangle image tiles scanned from natural color positive or color infrared positive aerial film into a single mosaic. The mosaic may cover all or portions of an individual final product. Each individual image tile within the mosaic covers a 3.75 x 3.75 minute quarter quadrangle plus a 300 meter buffer on all four sides. All individual tile images and the resulting mosaic were rectified to the UTM coordinate system, NAD 83, and cast into a single predetermined UTM zone.Download here >>
The Texas Gazetteer was developed to meet national and state needs by providing information for named entities in the United States, its territories, and outlying areas. Place names are of either cultural features such as schools, hospitals, cemeteries, etc., or physical features such as rivers, lakes, and summits. In all, over 25 feature tables constitute the database and supplement the already 55, 000 place names in the system, for a total of over 100,000 geographic names for Texas.Download here >>
Digital ortho-photographs are aerial photos that have been geometrically corrected to remove distortions. They have all the properties of a map, combined with the features of an aerial photo. Unlike an uncorrected aerial photograph, an ortho-photo can be used to measure true distances because it is an accurate representation of the earth's surface, having been adjusted for topographic relief, lens distortion, and camera tilt. Software can display the ortho-photo and allow a user to 'digitize' or place line-work, text annotations and geographic symbols.Download here >>
TNRIS houses US Census Bureau data commonly found in Census TIGER files. Available datasets for the state of Texas: Census Urban Areas, Census Tracts, Census Block Groups, Census Blocks, Census Demographics, Census Economics, Census Housing, and Census Social data.Download here >>
A digital raster graphic (DRG) is a scanned image of a USGS standard series topographic map, including all map collar information. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Universal Transverse Mercator projection. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map. The map is scanned at a minimum resolution of 250 dots per inch. Available scales: 1:24,000 or 7.5 by 7.5 minute quadrangle maps, 1:100,000 or 30 by 60 minute quadrangle maps, and 1:250,000 or 1 by 2 degree quadrangle maps.Download here >>
The U.S. Geological Survey (USGS) DEM data files are digital representations of ground surface topography or terrain. DEM's consist of a sampled array of elevations for a number of ground positions at regularly spaced intervals. The quality of a DEM is a measure of how accurate elevation is at each pixel (absolute accuracy) and how accurately is the morphology presented (relative accuracy). Several factors play an important role for quality of DEM's: terrain roughness, sampling density, elevation data collection method, Interpolation algorithm, vertical resolution, and terrain analysis algorithms.Download here >>
The National Elevation Dataset (NED) is a raster product assembled by USGS. NED is designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections were made in the NED assembly process to minimize artifacts, perform edge matching, and fill sliver areas of missing data. NED is the result of the maturation of the USGS effort to provide 1:24,000-scale Digital Elevation Model (DEM) data for the conterminous US and 1:63,360-scale DEM data for Alaska.Download here >>
Elevation contour DLG's (digital line graphics) are digital versions of the contour lines on all 7.5 minute, 1:24,000 scale USGS quadrangle maps. Elevation contours are also referred to as hypsography, meaning topographic relief. The contour interval used for StratMap digital contours is the same as that found on 7.5 minute USGS maps. Contour lines can be used to create digital elevation models (DEM's).Download here >>
The digital Q3 Flood Data was created by scanning the effective Flood Insurance Rate Map (FIRM) paper maps and digitizing selected features and lines. The data are designed to serve FEMA's needs for disaster response activities, National Flood Insurance Program activities, risk assessment, and floodplain management. Because digital Q3 Flood Data are controlled to the USGS 1:24,000 scale maps, they may not be detailed enough for some uses. The hardcopy FIRM or Digital Flood Insurance Rate Map should be used to make official determinations, especially if a property is close to the boundary of a mapped special flood hazard area.Download here >>
The Geologic Atlas of Texas was created as part of the conversion of the University of Texas, Bureau of Economic Geology Geologic Atlas of Texas map sheets. The information in this map was captured at 1:250,000 scale. These data should not be used for mapping at scales larger than 1:250,000. TNRIS carries the GAT in both raster and vector formats. The raster format is a scanned and geo-referenced version of the original Geologic Atlas sheets. The vector version has been digitized off the scanned sheets.Download here >>
The word "quadrangle" refers to a USGS 7.5-minute quadrangle map, which is usually named after a local physiographic feature. On a USGS 7.5-minute quadrangle map, the north and south limits of the quadrangle are not straight lines, but are actually curved to match Earth's lines of latitude on the standard projection. The east and west limits are usually not parallel as they match Earth's lines of longitude. The dataset was created to assist with locating the names and indexing information associated with each quadrangle and their approximate boundaries.Download here >>
TNRIS carries a digital version of the major and minor aquifers of Texas and categorizes them according to their outcrop and down dip sections. An outcrop is that part of a water-bearing rock that appears at the land surface, and a down dip is the part that dips below other rock layers.Download here >>
The 1:24,000 National Hydrography Dataset (NHD), jointly developed by the USGS and the Environmental Protection Agency (EPA), is a hydrologic data network designed to show all surface water features including rivers and streams, ponds and lakes, springs, canals, wetlands, and shorelines. The NHD dataset allows stream conditions to be modeled enabling the user to predict the downstream impact of a flood event. Also available is a generalized statewide hydrographic dataset which provides unique stream and river identification codes and flow information at the 1:100,000 scale. The NHD dataset can be downloaded directly from the USGS NHD website.Download here >>
This dataset contains vector and raster layers of average monthly and annual precipitation for the climatologically period between 1961 and 1990. Parameter elevation Regressions on Independent Slopes Model (PRISM) derived raster data is the underlying data set from which the polygons and vectors were created. PRISM is an analytical model that uses point data and a digital elevation model (DEM) to generate gridded estimates of annual, monthly and event-based climatic parameters. Detailed descriptions of the PRISM raster data can be found with the accompanying raster data sets.Download here >>
Hydrologic unit boundaries define the aerial extent of surface water drainage to a point. Hydrologic units through four levels were created in the 1970's and have been used extensively throughout the United States. During that time the USGS developed a hierarchical hydrologic unit code for the US. This system divides the country into 21 Regions, 222 Sub regions, 352 Accounting Units, and 2,149 Cataloging Units based on surface hydrologic features. The smallest USGS unit (8-digit HU) is approximately 448,000 acres.Download here >>
LandSAT represents the world's longest continuously acquired collection of space-based land remote sensing data. The LandSAT Project is a joint initiative (USGS & NASA) designed to gather Earth resource data from space. NASA developed and launched the spacecrafts, while the USGS handles the operations, maintenance, and management of all ground data reception, processing, archiving, product generation, and distribution. LandSAT's Global Survey Mission is to repeatedly capture images of the Earth's land mass, coastal boundaries, and coral reefs, and to ensure that sufficient data are acquired to support the observation of changes on the Earth's land surface and surrounding environment.Order LiDAR >>
High resolution Elevation data for selected counties in Texas derived from LiDAR. LiDAR is a technology that utilizes lasers to measure the distance from an airborne sensor (such as an airplane) to points on the ground to create an accurate 3-dimensional representation of the earth’s surface.Download here >>
This dataset was set up as a system to identify broad natural regions of Texas, to serve as a common point of reference for scientists, students, visitors and all citizens of Texas; and to locate and recommend for preservation natural areas that contain unique, significant, unusual and scenic resources, including rare or endangered species and endangered geological formations and ecosystems, with the goal of preserving elements of Texas natural diversity.Download here >>
SPOT is a high-resolution, optical imaging earth observation satellite system operated by Spot Image based in Toulouse, France. It was initiated by the CNES (French space agency) in the 1970's and developed in association with the SSTC (Belgian scientific, technical and cultural services) and the Swedish National Space Board (SNSB). It has been designed to improve the knowledge and management of the earth by exploring the earth's resources, detecting and forecasting phenomena involving climatology and oceanography, and monitoring human activities and natural phenomena. The SPOT system includes a series of satellites and ground control resources for satellite control and programming, image production and distribution.Download here >>
The Shuttle Radar Topography Mission is an international project spearheaded by the U.S. National Geospatial-Intelligence Agency (NGA) and NASA. The project developed digital elevation models on a near-global scale from 56 °S to 60 °N, to generate the most complete high-resolution digital topographic database of Earth to date. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during the 11-day STS-99 mission in February of 2000.Download here >>
The Public-Use Airports database, from the Bureau of Transportation Statistics, is a geographic point database of aircraft landing facilities in the United States and U.S. Territories. Attribute data is provided on the physical and operational characteristics of the landing facility, current usage including enplanements and aircraft operations, congestion levels and usage categories. The database provides location and attribute information for use in national and regional cartographic and spatial analysis applications.Download here >>
Texas Department of Transportation (TxDOT) GIS centerline based inventory of the state maintained roads. The routes are a comprehensive routed GIS centerline basemap for the State of Texas. The routes are a polylineM feature type with measures starting at the beginning of the route.Download here >>
The statewide railroad layer was originally digitized from the USGS 7.5 quadrangles by TXDOT. The railroad layer was extracted from the TxDOT county\urban files and photo revised to match the 1995 TOP aerial photography. The layer was attributed by using both TxDOT and Texas Railroad Commission information. This layer will be continually updated to reflect the most current information.Download here >>
The StratMap transportation layer is an updated, digital version of the transportation features found on the 7.5 minute, 1:24,000 scale USGS quadrangle maps. Where available, digital ortho-photography and GPS data are used to improve positional accuracy. Transportation features encompass all public roads in Texas, including city streets, state and federal highways, interstates, and selected private roads. The transportation layer is designed to be a universal transportation layer that can be integrated into a GIS application or project. The StratMap statewide transportation dataset is a publicly available digital data layer which serves as a cartographic product for seamless basemap production.Download here >>
The TxDOT Urban files are provided in three data formats ".dgn", ".dwg", and ".e00". TxDOT supplies the data in native .dgn format. TNRIS creates ".dwg" and ".e00" files by converting the dgn file using the conversion tools available in ArcGIS. During this conversion process, some annotation will not convert to the other formats leaving features without attribution. TxDOT has stopped updating the dgn files in 2003 however; the data is still available and is organized by County Name on our FTP site. The metadata file can also be found in the root of the directory.
Current and Historical USGS Printed Maps
TNRIS was the first Earth Science Information Center (ESIC) designated by the U.S. Geological Survey and, as such, serves as the primary source for USGS topographic maps covering Texas. This includes current and historical maps. USGS topographic maps highlight physical (natural) as well as cultural (man-made) surface features.
USGS Topographic Maps
The most detailed map is the 1:24,000 scale, 7.5 minute USGS topographic map. The sheet size is approximately 22 x 27 inches.
Additional USGS printed maps include:
- 1:100,000 scale, 30-by-60 minute series
- 1:250,000 scale, 1-by-2 degree series
- 1:500,000 scale
- 1:1,000,000 scale
A limited collection of historic USGS topographic maps dating back to the late 1800s are available for reproduction.
National Wetlands Inventory (NWI) Maps
The National Wetlands Inventory (NWI) maps are now available free through our download page.
National Floodplain Maps
A collection of National Floodplain Maps are available for reproduction.
For additional information for these or any other products and services, please contact us.
What is LiDAR?Light Detection and Ranging (LiDAR) is a technology that utilizes lasers to determine the distance to an object or surface. LIDAR can also be used for creating three dimensional topographical maps and surveys of geographical regions. LIDAR is very similar to radar, but it incorporates laser pulses rather than radio waves. Both systems determine distance by measuring the time delay between transmission and reflection of a pulse.
LiDAR Elevation for TexasAn increasing demand for elevation data has prompted the use of LiDAR as a method to acquire a newer and more accurate elevation data set for Texas. In 2006, Texas began Airborne LiDAR projects with funding from the Federal Emergency Management Agency (FEMA).
Additional uses for LiDARLiDAR is used in a variety of industries, including:
- Atmospheric physics
- Law enforcement
Digital Aerial Imagery
TNRIS has a substantial library of digital aerial imagery from the Texas Orthoimagery Program (TOP) and National Agricultural Imagery Program (NAIP). The imagery dates range from 1996 - present and are available free of charge from our data download section.
Statewide Landsat 5 and 7 satellite image GeoTIFFs are available for direct download free of charge from the USGS Global Visualization Viewer. Landsat 5 and 7 color balanced GeoJPEGs are available through the UT-Austin Center for Space Research Landsat Locater.
Statewide MODIS and ASTER satellite imagery are available in near real-time from the UT-Austin Center for Space Research Data Query.
Historical Aerial Photography Archive
TNRIS maintains the most extensive archive of historical aerial photography covering the entire state of Texas. The collection of black and white, natural color, and color infrared prints represents approximately one million photographs going back to the 1920’s.
The photographs originate from three main sources: Texas Department of Transportation, Agriculture Stabilization and Conservation Service (now known as the US Department of Agriculture), and the US Geological Survey. Scales of the photography range from 1:62,500 to 1:15,840, the most common scale being 1:24,000.
Historical Photographic Searches
TNRIS staff can assist the public with searches for historical aerial photography. The photographs can be copied at scales as large as 1:6,000 (one inch = 500 feet) on a high-quality laser copier.
For additional information on these services, please contact us.