Vector remove small lines
Q: How to remove small vector lines? I want to only delete spurious lines.
A1: You may the following approach:
- use to join broken vector segments into longer segments
- then use with option=length (line length) to upload the vector segment lengths to the attribute table
mypolyline column="length_km double precision" mypolyline type=line option=length units=k column=length_km
- now use to extract the longer vector segments into a new map according to a threshold you need. Example: Extract line features longer than 5km (cleans out the noise):
in=mypolyline out=mypolyline_over5km type=line where="length_km > 5.0"
A2: Alternative approach:
Removes from vector map all lines with length shorter than 50 map units (thresh: threshold distance (coords,snap,query)):
mymap tool=delete query=length thresh=-1,0,-50 type=line