AERMAP includes the capability of estimating terrain elevations for sources based on the same

data and procedures used to estimate receptor elevations. However, the requirements for

determining source elevations are somewhat different than the requirements for determining

receptor elevations since a greater emphasis is placed on the accuracy of elevations at specific

locations in the case of sources. While the accuracy of specific receptor elevations is also

important, the main focus for receptors should be on how well the terrain features are defined by

the receptor network as a whole, which is based on both the accuracy of the terrain data and the

horizontal resolution of the receptor network. As noted in Section 4.3, it is advisable to check

the accuracy of receptor elevations and hill height scales for significant terrain features that are

likely to be associated with peak concentrations. These accuracy checks should also account for



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