Gulf of Mexico region — Highlighting low-lying areas derived from USGS Digital Elevation Data

Scientific Investigations Map 3048



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.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Gulf of Mexico region — Highlighting low-lying areas derived from USGS Digital Elevation Data
Series title Scientific Investigations Map
Series number 3048
DOI 10.3133/sim3048
Edition Version 1.0
Year Published 2008
Language English
Publisher U.S. Geological Survey
Contributing office(s) Central Region Geospatial Information Office
Description 1 Plate: 56 x 34 inches; Downloads Directory
Country United States
State Alabama, Florida, Louisiana, Mississippi, Texas
Other Geospatial Gulf of Mexico
Projection Albers Conic Equal Area
Scale 1350000
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details