Stream to Feature (Spatial Analyst)
Summary
Converts a raster representing a linear network to features representing the linear network.
Usage
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The input stream raster linear network should be represented as values greater than or equal to one on a background of NoData.
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The results of the Flow Accumulation tool can be used to create a raster stream network by applying a threshold value to select cells with a high accumulated flow. For example, cells that have more than 100 cells flowing into them are used to define the stream network. Use the Con or Set Null tool to create a stream network raster where flow accumulation values of 100 or greater go to one, and the remainder are put to the background (NoData). The resulting stream network can be used in Stream Link and Stream to Feature.
An analytical method for determining an appropriate threshold value for stream network delineation is presented in Tarboton, et al. (1991).
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There should be contiguous features with the same value, such as the results of the Stream Order or Stream Link tool. Stream to Feature should not be used on a raster in which there are few adjacent cells of the same value.
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The direction of the output features will point downstream.
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 |
out_polyline_features |
Output feature class that will hold the converted streams. | Feature Class |
simplify (Optional) |
Specifies whether weeding is used.
By default, weeding is applied. | Boolean |
Code Sample
This example converts a raster representing a linear network to features.
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
StreamToFeature("stream", "flowdir", "c:/sapyexamples/output/outstrm01.shp",
"NO_SIMPLIFY")
This example converts a raster representing a linear network to features.
# 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"
inFlowDir = "flowdir"
outStreamFeats = "c:/sapyexamples/output.gdb/outstrm02"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute
StreamToFeature(inStreamRaster, inFlowDir, outStreamFeats,
"NO_SIMPLIFY")