EGB Hydro Centerline (Defense Mapping)
Summary
Converts hydrographic polygon features into individual polyline centerlines. This tool is used by the Esri Defense Mapping solution to create polyline hydrographic features at scales where a polygon feature is inappropriate or not useful. It produces an approximate centerline from input polygons. This centerline serves as a polyline representation of the original polygon feature.
Usage
This tool creates one polyline centerline for each input hydro area polygon.
This tool will copy attribute values from Hydro Area Input Features to Hydro Polyline Output Features if both share identical field names and definitions.
Hydro Area Input Features and Hydro Polyline Output Features must have the same coordinate system.
Syntax
| Parameter | Explanation | Data Type |
in_polygon_features |
The polygon features from which centerlines will be generated. | Feature Layer |
in_polyline_features |
A preexisting polyline feature class. | Feature Layer |
Code Sample
The following stand-alone script demonstrates how to use the EGBHydroCenterline tool.
# EGBHydroCenterline_Example.py
# Description:
# Requirements: Esri Defense Mapping solution, 3D Analyst extension, Spatial Analyst extension
# Import arcpy module
import arcpy
# Check out a DefenseMapping extension license
arcpy.CheckOutExtension("3d")
arcpy.CheckOutExtension("foundation")
arcpy.CheckOutExtension("defense")
arcpy.env.workspace = "c:\\data\\HydroTest.gdb"
inPolyFeatures = "HydrographySrf"
inPolylineFeatures = "HydrographyCrv"
# Create 2 feature layers for processing
arcpy.MakeFeatureLayer_management(inPolyFeatures,'inPolyFeats')
arcpy.MakeFeatureLayer_management(inPolylineFeatures,'inPolyLineFeats')
# execute the EGB Hydro Centerline tool
arcpy.EGBHydroCenterline_defense('inPolyFeats', 'inPolyLineFeats')
print arcpy.GetMessages()
# Check in the extensions
arcpy.CheckInExtension("3d")
arcpy.CheckInExtension("foundation")
arcpy.CheckInExtension("defense")