Given a KML file with more coordinates than necessary, this node script will reduce the coordinates to a requested density.
Written to create maps of my bike routes in Buenos Aires.
Note: This does not actually parse any XML, it simply regex's each line to find coordinates, strips out unwanted ones, and leaves the rest of the lines intact. The algorithm is very "dumb": given a reduce parameter of 2, it keeps every other (1 out of 2) coordinates; with 5, it strips 4/5; etc.
node ./node-kml-reduce-density.js --in [PATH] --out [PATH] --reduce [NUM] Options: --in source KML file [required] --out write to new KML file [required] --reduce Preserve 1/N coordinates. 1=all, 4=25%, 10=10%. Default 2 (50%). [required] [default: 2]
- Version that also checks the distance between points: https://gist.github.com/1709189