ETG_StreamsAndWatershed

Streams and Watershed from DEM

Creates Stream features and optionally Nodes features and Watershed raster from a DEM.

A Polyline feature layer. Each polyline represents a section of the Stream network between two junctions or from a junction to an outlet or from stream head to junction.
Optional Point feature layer. Each point represents a node of the Stream network - a junction or an outlet or a stream head.
Optional Watershed Raster representing the contributing areas for each outlet (integer raster).

An example of Streams And Watershed output - Streams and Nodes Features and Watershed raster.

This function provides a straightforward way to create a Stream Network features and optionally Node features and Watershed raster from DEM. It calculates in the background the necessary Flow Direction and Flow Accumulation rasters depending on the selection of the Flow Direction method. The Watershed Raster represents Watersheds for all Outlet points determined from the Flow Direction raster and Watershed IDs are automatically generated.
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 OutputStreams define the raster format:
- .img extension (for example raster1.img) - ERDAS IMAGINE image.
- .tif extension (for example raster1.tif - image.
- The initial OutputStreams format can be changed by selecting the desired output in the dialog.

Parameters

Expression	Explanation
Function Name	StreamsAndWatershed
<InputRasterDEM>	A String representing the input DEM raster dataset.
<OutputStreams>	A String representing the output stream layer.
<FlowDirectionMethod>	A String - the full name of the output stream feature layer.
<StreamInitiationThreshold>	A Double representing the number of Flow Accumulation cells at which a Stream is initiated.
{OutputNodes}	A String - the full name of the output nodes feature layer.
{OutputWatershed}	A String - the full name of the output watershed raster.

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

UnitsDegrees

Language	Syntax
Python	subprocess.call([ETSPath, "StreamsAndWatershed", "InputRasterDEM", "OutputStreams", "FlowDirectionMethod", "StreamInitiationThreshold", "OutputNodes", "OutputWatershed"])
.NET using ETSRun.exe	StartInfo.FileName = ETSPath StartInfo.Arguments = "StreamsAndWatershed" "InputRasterDEM" "OutputStreams" "FlowDirectionMethod" "StreamInitiationThreshold" "OutputNodes" "OutputWatershed"
.NET using ETSOutX.dll	StreamsAndWatershed(InputRasterDEM, OutputStreams, FlowDirectionMethod, StreamInitiationThreshold, OutputNodes, OutputWatershed)
ArcPy	arcpy.StreamsAndWatershed("InputRasterDEM", "OutputStreams", "FlowDirectionMethod", "StreamInitiationThreshold", "OutputNodes", "OutputWatershed")

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.