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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