A bare earth elevation map (also known as a Digital Elevation Model, or DEM) of the northern Gulf of Mexico barrier islands and Naval
Live Oaks was produced from remotely sensed, geographically referenced elevation measurements cooperatively by the U.S. Geological
Survey (USGS), the National Park Service (NPS), and the National Aeronautics and Space Administration (NASA). This data set provides the
those bare earth elevation measurements of the barrier islands in the following counties:
St. Bernard in LA, Harrison and Jackson in MS, Mobile and Baldwin in AL, and Escambia and Santa Rosa in FL.
Elevation measurements were collected over the area using the NASA Experimental Advanced Airborne Research Lidar (EAARL),
a pulsed-laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal topography.
The system uses high-frequency laser beams directed at the Earth's surface through an opening in the bottom of the aircraft's fuselage.
The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the
aircraft. The plane travels over the target area at approximately 50 meters per second at an elevation of approximately 300 meters.
The EAARL, developed by NASA at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of
15 centimeters. A sampling rate of 3 kilohertz or higher results in an extremely dense spatial elevation dataset. Over 100 kilometers
of coastline can be surveyed easily within a 3- to 4-hour mission. When subsequent elevation maps for an area are analyzed, they provide
managers with a useful tool to make management decisions regarding land development.
Original contact information:
Contact Name: Amar Nayegandhi or John Brock at USGS
Contact Org: Jacobs Technology, contracted to USGS
Title: Computer Scientist
Phone: 727-803-8747 x3026
Email: anayegandhi@usgs.gov
This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.