Given the number of options available for elevation data inputs to AERMAP, and the range of

issues associated with elevation data, users are encouraged to clearly document the source of

elevation data used for AERMOD applications in the modeling protocol, including the resolution

and horizontal reference datum for the data and any pre-processing that might have been done,

such as converting from one format to another. Since the NED data are being checked for

quality and updated as needed, AERMAP users should also consider acquiring updated terrain

files on a periodic basis before use in regulatory modeling applications. If the option to provide

receptor elevations to AERMAP is utilized, rather than using the default option of determining



n201 - n202 - n203 - n204 - n205 - n206 - n207 - n208 - n209 - n210 - n211 - n212 - n213 - n214 - n215 - n216 - n217 - n218 - n219 - n220 - n221 - n222 - n223 - n224 - n225 - n226 - n227 - n228 - n229 - n230 - n231 - n232 - n233 - n234 - n235 - n236 - n237 - n238 - n239 - n240 - n241 - n242 - n243 - n244 - n245 - n246 - n247 - n248 - n249 - n250


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