Beginning with the version dated 09040, AERMAP can also process terrain elevations derived

from the Shuttle Radar Topography Mission (SRTM) since they are available in the same

GeoTIFF format as NED data from the USGS Seamless Data Server. SRTM elevation data is

also available for most of the U. S. at 1 arc-second and 3 arc-second resolutions from various

sources. However, SRTM elevations represent the height of the "reflective surface" for the radar

signal, and therefore include the heights of obstacles such as buildings and trees (USGS, 2009).

NED data represents the ground ("bare earth") elevation, which is a more appropriate input for

determining receptor elevations and hill height scales for use in AERMOD. AERMOD users

should therefore avoid the use of SRTM data to determine elevations for use in AERMOD.

However, SRTM data are also available at 3 arc-second resolution for most of the globe, and

may be the only practical alternative for applications beyond the U. S. While AERMAP can

process both NED and SRTM data in GeoTIFF format in the same run, the only situation that

might warrant such an approach would be applications along a border that extends beyond the

domain covered by the NED data. The SRTM elevation data are typically based on the WGS84

horizontal datum, rather than the NAD83 datum used for most NED data. While AERMAP


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