ArcGIS Tutorial: Stream connections

　Summary

Assigns unique values to the parts of a grid-line network between junctions.

　　Usage

· "Connection" means the section of a river that connects two adjacent junctions, connects to a junction and outlet, or joins a junction and watershed.

　　

· The input stream raster data can be created by setting thresholds for the results of the traffic tool.

· On the background of NoData, the stream grid line network should be represented as a value greater than or equal to one.

　Grammar

Streamlink (In_stream_raster, In_flow_direction_raster)

　　Code instance

　　Streamlink Example 1 (Python window)

This example assigns a unique value to each part of the grid-line network between junctions.

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 a unique value to each part of the grid-line network between junctions.

# 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")

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ArcGIS Tutorial: Stream connections