Collapse Dual Lines To Centerline (Coverage)

Summary

Derives centerlines (single lines) from dual-line features, such as road casings, based on specified width tolerances.

Learn more about how Collapse Dual Lines To Centerline works

Illustration

Usage

• In addition to the standard items, the Output Coverage.AAT will contain the following five new items:

  • LTYPE—Contains a line type value of:

    1   centerlines
    	2   unused lines and outlines of complicated intersections
    	3   partition lines
    

  • LL#—Carries the left source arc record number.
  • RL#—Carries the right source arc record number.
  • L-ID—Carries the left source arc user ID.
  • R-ID—Carries the right source arc user ID.

• The values for item_width, output_width, and item_type in the item definition for all these items are 4, 5, and B.

Syntax

CollapseDualLinestoCenterline_arc (in_cover, out_cover, maximum_width, {minimum_width})

Parameter	Explanation	Data Type
in_cover	The coverage containing near parallel dual lines, such as road casings, from which centerlines are derived.	Coverage
out_cover	The output coverage containing the derived centerlines. The output coverage name must be different from the input coverage name.	Coverage
maximum_width	Sets the maximum width in coverage units.	Double
minimum_width (Optional)	Sets the minimum width in coverage units. The default is zero.	Double

Code Sample

CollapseDualLinesToCenterline example (stand-alone script)

The following stand-alone script demonstrates how to create a line coverage of street centerlines from a line coverage of street casings.

# Name: CollapseDualLinesToCenterline_Example.py
# Description: Creates street centerlines from a street casing coverage.
# Requirements: ArcInfo Workstation

# Import system modules
import arcpy
from arcpy import env

# Set environment settings
env.workspace = "C:/data"

# Set local variables
inCover = "streets"
outCover = "C:/output/centerlines"
maximumWidth = 50

# Execute CollapseDualLinesToCenterline
arcpy.CollapseDualLinesToCenterline_arc(inCover, outCover, maximumWidth, "")

Environments

Current Workspace, Level Of Comparison Between Projection Files, Precision For Derived Coverages, Precision For New Coverages, Scratch Workspace

Licensing Information

ArcGIS for Desktop Basic: No

ArcGIS for Desktop Standard: No

ArcGIS for Desktop Advanced: Requires ArcInfo Workstation installed