Find NoFlow Areas

Running programmatically

Finds cells in DEM rasters with undefined flow based on the D8 flow direction algorithm. These cells are either sinks (lower than all neighboring cells) or in the interior of a flat area. The flat area cells are marked with value of 1 and the sink cells with the value 2.

Inputs:

• Input DEM raster dataset
• Output raster name and format

Outputs:

• A raster indicating the cells without flow in the DEM on a background of NoData.

Example:

An example of the NoFlow Areas output - Flat areas with light blue and Sinks with dark blue.

Notes:

• An output value of 1 indicates that the cell belongs to a flat area - there is no lower neighboring cell and the lowest neighbor has the same elevation.
• An output value of 2 indicates a sink - meaning that all neighboring cells are with higher elevation.
• See Hydrological functions for more information on the hydrological functionality.
• The input format accepted are file based rasters - ERDAS IMAGINE or Tagged Image File Format (TIFF).
• The .NET ToolBox for ArcGIS Desktop accepts also FileGDB Raster inputs.
• For file based rasters initially the name of the output raster define the raster format:
  • .img extension (for example raster1.img) - ERDAS IMAGINE image.
  • .tif extension (for example raster1.tif - image.
  • The initial output raster format can be changed by selecting the desired output in the dialog.

Running Programmatically

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Parameters

Running the function

ETSPath used in the table below is the full path to ETSRun.exe (E.G. "C:\Program Files\ETSpatial Techniques\ETSurface\ETSRun.exe")

Notes:

• <> - required parameter
• {} - optional parameter
• See examples for Python , .NET or ArcPy

• The argument separator for StartInfo.Arguments is space. If a string might contain a space, you need to double quote it.

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