1.0 WHAT’S NEW IN THIS DOCUMENT
Revisions dated March 19, 2009:
The following sections have been affected by this revision:
4.3 TERRAIN ELEVATION DATA SOURCES FOR AERMAP
This new section discusses sources of terrain elevation data for input to AERMAP to
determine receptor elevations and hill height scales, including terrain data in the traditional
U. S. Geological Survey (USGS) Digital Elevation Model (DEM) data format, and the
newer National Elevation Dataset (NED) data in GeoTIFF format also supported by
AERMAP, beginning with version 09040. The importance of documenting sources of
terrain data in the modeling protocol is emphasized.
4.4 MANUALLY ENTERING TERRAIN ELEVATIONS IN AERMAP
This section, formerly numbered as Section 4.3, includes revisions to reflect the support for
both DEM and NED elevation data in AERMAP, beginning with version 09040.
4.5 USE OF AERMAP TO DETERMINE SOURCE ELEVATIONS
This new section discusses the use of AERMAP to determine terrain elevations for sources,
and encourages the use of source elevations based on plant surveys as a generally preferred
option over the use of AERMAP.
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