Feature Description
The Centerline From Double Lines function extracts centerlines between non-closed double lines based on specified width thresholds and saves the result as a line dataset. This method is particularly suitable for processing road line data, delivering optimal results when double lines are parallel or nearly parallel.
Feature Entry
- Data Tab->Data Processing->Vector->Center Line of Double Lines.
- Toolbox->Data Processing->Vector->Center Line of Double Lines.
Parameter Description
- Source Dataset: Specifies the line dataset and its datasource for centerline extraction.
- Maximum Width: Defines the maximum width threshold (greater than 0) between double lines for centerline extraction. Default value is 30, using the same unit as source dataset. Users can measure actual width via the right-side button. Recommended to set slightly larger than actual measured distance for better accuracy.
- Minimum Width: Defines the minimum width threshold (greater than or equal to 0) between double lines. Centerlines won't be extracted where line spacing is below this value. Default is 0, same unit as source dataset.
Notes:Width thresholds share the same unit with source dataset. Maximum width must be greater than 0 and is mandatory. Centerlines will be extracted when line spacing falls between thresholds; No extraction occurs below minimum width; Boundary lines are extracted when exceeding maximum width.
- Result Data: Specifies output datasource and dataset name.
The result centerline dataset preserves source attributes, with fields distinguished by L and R suffixes indicating left/right original line objects.
Notes:- Applicable to non-closed line datasets. For closed double lines, create an opening by breaking endpoints first.
- Maximum width setting critically affects result accuracy. Ensure precise input.
- Complex intersections (e.g., overpasses, 5-way/6-way junctions) may yield suboptimal results.
Related Topics
Extract Main Lines From Polygon