Terrain data are often a necessary part of dispersion modeling. Our visualization tools help to quality control model object placement in relation to terrain heights. Used in conjunction with BREEZE software, adding terrain data to your model has never been easier.
Terrain data are available in Digital Elevation Model (DEM) and National Elevation Dataset GeoTIFF (NED) format. Three types of files are available:
- 10 meter or 30 meter resolution NED GeoTIFF tiles (U.S. locations only)
- 30 meter resolution DEM tiles (U.S. locations)
- 90 meter resolution DEM tiles (Worldwide)
NED Data (U.S.)
NED data is currently considered the “gold standard” for U.S. terrain data. This dataset is constantly refined and improved. Recent changes to the NED format have made it difficult to find NED data that is compatible with the AERMAP pre-processor for the AERMOD and ISCST3 models. The BREEZE team can provide AERMAP-ready NED data for the entire U.S. at 30 meter resolution and for select areas at 10 meter resolution.
DEM Data (U.S.)
For some applications such as the FAA's EDMS dispersion modeling utility, DEM-format terrain data is required. These data can also be used for many other purposes such as adding 3-D visualization of terrain in graphics programs. BREEZE provides 7.5 minute DEM tiles for the United States. Each tile covers an area that is 7.5 minutes of latitude by 7.5 minutes of longitude (approximately 10 miles by 10 miles). Coordinates are in Universal Transverse Mercator (UTM) format and the resolution is 30 meters.
The 7.5 Minute Digital Elevation Model (DEM) is a widely supported format produced by the United States Geophysical Survey (USGS).
DEM Data (Worldwide)
You can purchase 1 Degree DEM tiles for nearly anywhere in the world. Each tile covers a block of land that is 1 degree of latitude by 1 degree of longitude (approximately 100 km by 100 km in most locations) and is centered at the location of your choice. Coordinates are in arc seconds with a resolution of approximately 90 meters. Custom sized DEM tiles with 90 meter resolution are also available.