Available with Spatial Analyst license.
Summary
Assigns unique values to sections of a raster linear network between intersections.
Usage
Links are the sections of a stream channel connecting two successive junctions, a junction and the outlet, or a junction and the drainage divide.
Illustration of the links in a stream channel The input stream raster can be created by thresholding the results of the Flow Accumulation tool.
The stream raster linear network should be represented as values greater than or equal to one on a background of NoData.
See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.
Syntax
StreamLink (in_stream_raster, in_flow_direction_raster)
| Parameter | Explanation | Data Type |
in_stream_raster |
An input raster that represents a linear stream network. | Raster Layer |
in_flow_direction_raster | The input raster that shows the direction of flow out of each cell. The flow direction raster can be created using the Flow Direction tool. | Raster Layer |
Return Value
| Name | Explanation | Data Type |
| out_raster | The output stream link raster. This output is of integer type. | Raster |
Code Sample
StreamLink example 1 (Python window)
This example assigns unique values to sections of a raster linear network between intersections.
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outStreamLink = StreamLink("stream", "flowdir")
outStreamLink.save("c:/sapyexamples/output/outstrmlnk01")
StreamLink example 2 (stand-alone script)
This example assigns unique values to sections of a raster linear network between intersections.
# Name: _Ex_02.py
# Description:
# Requirements: Spatial Analyst Extension
# Import system modules
import arcpy
from arcpy import env
from arcpy.sa import *
# Set environment settings
env.workspace = "C:/sapyexamples/data"
# Set local variables
inStreamRaster = "stream"
inFlowDirection = "flowdir"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute StreamLink
outStreamLink = StreamLink(inStreamRaster, inFlowDirection)
# Save the output
outStreamLink.save("c:/sapyexamples/output/outstrmlnk02")
Environments
Licensing Information
- ArcGIS for Desktop Basic: Requires Spatial Analyst
- ArcGIS for Desktop Standard: Requires Spatial Analyst
- ArcGIS for Desktop Advanced: Requires Spatial Analyst