4.4 MANUALLY ENTERING TERRAIN ELEVATIONS IN AERMAP (03/19/09)

AERMAP currently does not have the capability of accepting hand-entered terrain data in an

"xyz" format. AERMAP only accepts terrain data from digitized elevation files in the DEM or

NED/GeoTIFF formats. Therefore, if no DEM or NED/GeoTIFF data are available for a

particular application, terrain elevations may need to be determined through other means. One

option may be to manually enter gridded terrain elevations in a form that mimics the DEM data

format. Instructions for how to accomplish this can be found on the SCRAM web site

http://www.epa.gov/scram001/

in a document titled "On inputting XYZ data into AERMAP."

As noted in Section 4.3, if alternative sources and/or methods are used to estimate receptor

elevations, users must recognize that receptor elevations input to AERMOD should represent the

best estimate of the actual terrain elevation at the receptor location, and these alternative sources

and methods should be documented in the modeling protocol. As also noted in Section 4.3,

SRTM elevation data in GeoTIFF format is available for most of the globe, which may provide

another alternative source of elevation data for use in AERMAP. However, SRTM data

represents the heights of obstacles, such as buildings and trees, rather than ground elevations,

and should be used with caution and only as a last resort.

 

 

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