Burn Flat Polygons into DEM
Description
Modify elevation in the input DEM within the input flat areas defined by the input flat area raster. The resulting hydro-conditioned DEM will have the elevation within the flat areas decrease proportionally to the distance away from the edge of the flat polygon (further in, larger/deeper the elevation adjustment). Elevation along the edge of the flat polygon is maintained as is, practically creating a "bowl" within the input flat polygon.
The intent of this tool is to modify (hydro-condition) the DEM so that the continuous flow direction analysis can find the "optimal" path through the flat areas. Note that the use of resulting hydro-conditioned DEM with traditional D8 flow accumulation approach will generate sinks within the flat areas.
Usage
Parameters
Parameter Name | Type | Direction | Data Type | Dialog Reference |
---|---|---|---|---|
Input DEM Raster | Required | Input | Raster Layer | Input elevation raster. |
Input Flat Area Raster | Required | Input | Raster Layer | Input raster indicating where the flat areas are. This raster needs to have any valid value in the flat areas that need to be hydro-conditioned and nodata elsewhere. Arc Hydro tools "Identify Flat Areas" or "Create Sink Structure" can be used to create such raster. |
Output DEM Raster | Required | Output | Raster Layer | Output hydro-conditioned DEM raster with flat areas "bowled" in. |
Output Burn Raster | Optional | Output | Raster Layer | Name of the optional intermediate "bowl" raster. It has value of 0 in non-flat areas and values to be "bowled in" in the flat areas. If name is not provided (default), the raster will not be stored. Providing extension (e.g. .tif) in the name will ensure that the raster will be stored using that specific raster format. |