BREEZE meteorologists can provide you with AERMET- and AERMOD-ready meteorological and terrain datasets that are checked and quality assured according to U.S. EPA standards, adapting the EPA methodology as needed in cases where a local regulatory agency prefers to deviate from EPA guidance, or for international locations where U.S.-specific guidance does not apply. Our staff will help you identify the most appropriate station for your project and, if necessary, fill data according to regulatory standards.

AERMOD-Ready Meteorological Data

AERMOD, the preferred model of the U.S. EPA for near-field air dispersion modeling, requires the use of two meteorological files: the surface (.SFC) and profile (.PFL) file. BREEZE meteorologists can provide you with site-specific AERMOD-ready meteorological datasets that are checked and quality assured according to U.S. EPA standards, adapting the EPA methodology as needed in cases where a local regulatory agency prefers to deviate from EPA guidance, or for international locations where U.S.-specific guidance does not apply. Our staff will help you identify the most appropriate station for your modeling site and, if necessary, fill data according to regulatory standards.

We also generate land use characteristics specific to your chosen meteorological station. For locations within the United States, the latest version of AERSURFACE is used to generate land use characteristics.

AERMET-Ready Meteorological Data

In addition to processing AERMOD-ready meteorological data, the BREEZE Data Team can also process and provide site-specific AERMET-ready meteorological data. Land use parameters can change from place to place and season to season, so purchasing AERMET-ready meteorological data will enable you to input the desired land use parameters during the last stage of processing. AERMET-ready meteorological data is processed through Stage 2 and then provided in an .MRG format, which you can then use to process through Stage 3 of AERMET in order to generate the .SFC and .PFL file for your modeling site. 

Terrain Data for AERMOD

Terrain data are often a necessary part of dispersion modeling. Used in conjunction with BREEZE AERMOD, adding terrain data to your model has never been easier. Additionally, the visualization tools built into the software help to quality control model object placement in relation to terrain heights.

The BREEZE Data Team can provide terrain data in Digital Elevation Model (DEM) and National Elevation Dataset GeoTIFF (NED) formats. The three types of data files available are:

  • 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 Data 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 AEDT dispersion modeling utility, DEM-format terrain data is required. These data can also be used for many other purposes such as adding 3D 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.

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