| Abstract: | In support of U.S. Geological Survey (USGS) disaster preparedness efforts, this map depicts a color shaded relief representation of the area surrounding the Gulf of Mexico. 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 data) 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. Approximately one-half of the area shown on this map has DEM source data at a 30-meter resolution, with the remaining half consisting of 10-meter contour-derived DEM data or higher-resolution LIDAR data.
Areas below sea level typically are surrounded by levees or some other type of flood-control structures.
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 2005. |
| Genre: | USGS Numbered Series |
| ProdID: | 97099 |
| 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 |
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| Citation LatN: | 0313000 |
| Citation LatS: | 0240000 |
| Citation LonE: | -0790000 |
| Citation LonW: | -0983000 |
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| Citation Online Only Flag: | |
| Citation Phsyical Description: | Map Sheet: 56 x 34 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: | 3048 |
| Citation Search Results Text: | Gulf of Mexico Region - Highlighting Low-Lying Areas Derived from USGS Digital Elevation Data; 2008; SIM; 3048; Kosovich, John J. |
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| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Gulf of Mexico Region - Highlighting Low-Lying Areas Derived from USGS Digital Elevation Data; 2008; SIM; 3048; Kosovich, John J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3048/ |
| Date Other: | Thu, 27 Nov 2008 00:00 -0600 |
| Publisher: | Geological Survey (U.S.) |
