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Aspect has triangular shaped artifacts in flat areas and along the U.S. border where there are bodies of water: Triangulation appears around the U.S. border in lake and ocean regions. Even though there is some triangulation, wherever slope is 0, the aspect layer does not affect modeling in FARSITE, FlamMap, or FSPro.

Background:

Aspect is a derivative of the Elevation Derivatives for National Applications (EDNA) digital elevation model (DEM). Wherever there were no data in the DEM, aspect was filled using neighboring values, resulting in large triangular shapes in lakes and ocean regions. In addition, other flat area anomalies appear along older quad boundaries found in the original DEM layer. Again, these flat area artifacts are primarily in areas where slope is 0.

Advice:

Even though triangulation exists in the aspect layer in lake and ocean regions, wherever slope is 0, the aspect layer does not affect modeling in FARSITE, FlamMap, or FSPro.

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