2004 Gulf of Mexico (AL,FL,LA,MS) IfSAR: Digital Elevation Model (DEM)

Intermap DEMs populate its data store. The DEM products are generated using Intermap's STAR technology

(Interferometric Synthetic Aperture Radar). The system is mounted in an aircraft.

The Digital Terrain Model (DTM) data product was derived from the Digital Surface Model (DSM) using Intermap's

proprietory algorithm.

The DTM data for 7.5-minute by 7.5-minute units correspond to the USGS 1:24,000 scale topographic quadrangle map

series for areas in the United States and throughout the world. Each 7.5-minute by 7.5-minute DSM is comprised of

elevations at 5 meter postings. Each tile provides full coverage with overlap into adjacent tiles. Data for locations

above 56 degrees North/South are licensed in 7.5-minute by 15-minute tiles.

Original contact information:

Contact Org: NOAA Office for Coastal Management (OCM)

Phone: 843-740-1202

Email: coastal.info@noaa.gov

The DTMs are used as a fundamental layer of information in Geographic Information Systems (GIS) and Spatial

Information Decision Support Systems (DSS). A number of the priority layers of spatial information recognized by the

National Spatial Data Infrastructure may be derived from Intermap Technologies DEMs, including elevation, hydrography,

slope, aspect, and shoreline delineation.

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Ongoing

Any conclusions drawn from the analysis of this information are not the responsibility of, NOAA, the Office for Coastal Management or it's partners.

This data is under an End User License Agreement and is distributed by the Originator once the requestor contacts

the Office for Coastal Management at the above email address or telephone number.;

Purchase

End User License Agreement

This data is delivered on interoperable media with metadata. The data set was developed on

a Microsoft Windows system using Intermap's propriatory Interferometric Editing System (IES).

Calculation of the digital elevation model is described in the Intermap Technologies Core Product

Handbook User's Guide. <URL: http://www.intermap.com/images/handbook/producthandbook.pdf>

All data products are 2 meters RMSE or better in areas of unobstructed flat ground.

1 meter RMSE or better in areas of unobstructed flat ground.

Coverage maps are provided for each acquisition.

<URL: http://www.intermap.com/images/handbook/producthandbook.pdf>

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