Stream Link (Spatial Analyst)
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.
Syntax
| 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. It will be of integer type. | Raster |
Code Sample
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")
This example assigns unique values to sections of a raster linear network between intersections.
# Name: _Ex_02.py
# Description:
# Requirements: Spatial Analyst Extension
# Author: ESRI
# 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")