ArcMap

Collapse Dual Lines To Centerline

Available with Advanced license.

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

Creating centerlines

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

arcpy.arc.CollapseDualLinestoCenterline(in_cover, out_cover, maximum_width, {minimum_width})
ParameterExplanationData 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

Licensing information

  • Basic: No
  • Standard: No
  • Advanced: Requires ArcInfo Workstation installed

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