I have geojson data that draws shapes similar to the following:

enter image description here

I wanted to know if there are any operations that can give me the geojson which represents the outline of these shapes represented by the red lines in the following image:

enter image description here

obviously the coordinates do not have to match exacly what is represented by the red lines I only need the coordinates to wrap the outside boundaries of the shape.

  • What software are you using? It is better to convert geojson into shp etc then transform and get the transformed geojson.. – SIslam Aug 21 '15 at 19:25
  • 4
    Sounds like you want a convex hull. – crmackey Aug 21 '15 at 19:28
  • I'm a programmer, and I am looking for a known formula to apply to many of these kind of shapes. – Xerxes Aug 21 '15 at 19:29
  • 1
    turf js has code for a convex hull from a set of points (vertices of a polygon) geoJSON example mapbox.com/mapbox.js/example/v1.0.0/turf – Mapperz Aug 21 '15 at 19:38
  • Here are code samples in multiple languages, pick your poison: en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/… – crmackey Aug 21 '15 at 20:02

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