| Abstract: | In support of U.S. Geological Survey (USGS) disaster preparedness efforts, this map depicts a color shaded relief representation of Texas and a grayscale relief of the surrounding areas. The first 30 feet of relief above mean sea level are displayed as brightly colored 5-foot elevation bands, which highlight low-elevation areas at a coarse spatial resolution. Standard USGS National Elevation Dataset (NED) 1 arc-second (nominally 30-meter) digital elevation model (DEM) data are the basis for the map, which is designed to be used at a broad scale and for informational purposes only.
The NED data were derived from the original 1:24,000-scale USGS topographic map bare-earth contours, which were converted into gridded quadrangle-based DEM tiles at a constant post spacing (grid cell size) of either 30 meters (data before the mid-1990s) or 10 meters (mid-1990s and later data). These individual-quadrangle DEMs were then converted to spherical coordinates (latitude/longitude decimal degrees) and edge-matched to ensure seamlessness. The NED source data for this map consists of a mixture of 30-meter- and 10-meter-resolution DEMs.
State and county boundary, hydrography, city, and road layers were modified from USGS National Atlas data downloaded in 2003. The NED data were downloaded in 2002. Shaded relief over Mexico was obtained from the USGS National Atlas. |
| Genre: | USGS Numbered Series |
| ProdID: | 97101 |
| Citation Author: | Kosovich, John J. |
| Citation Contributing Office: | Central Region Geospatial Information Office |
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| Citation Edition: | Version 1.0 |
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| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0363000 |
| Citation LatS: | 0253000 |
| Citation LonE: | -0924500 |
| Citation LonW: | -1073000 |
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| Citation Phsyical Description: | Map Sheet: 39 x 35 inches; Downloads Directory |
| Citation Projection: | Albers Conic Equal Area |
| Citation Public Comments: | |
| Citation Publisher: | Geological Survey (U.S.) |
| Citation Series: | Scientific Investigations Map |
| Citation Series Code: | SIM |
| Citation Series Number: | 3050 |
| Citation Search Results Text: | State of Texas - Highlighting Low-Lying Areas Derived from USGS Digital Elevation Data; 2008; SIM; 3050; Kosovich, John J. |
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| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | State of Texas - Highlighting Low-Lying Areas Derived from USGS Digital Elevation Data; 2008; SIM; 3050; Kosovich, John J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3050/ |
| Date Other: | Thu, 27 Nov 2008 00:00 -0600 |
| Publisher: | Geological Survey (U.S.) |
