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In qgis, how to generate the blue outer edge (the concave surface close to the outer edge point) in Fig. 2 from the point in Fig. 1. Any suggestion?enter image description here

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marked as duplicate by BERA, PolyGeo Mar 15 at 10:28

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    What's wrong with the two concave hull processing tool or the concave hull plugin ? – J.R Mar 15 at 10:36
  • The answer is the following: 1) run the Delaunay Triangulation tool on the points ... and delete unnecessary triangles in edit mode (pencil); 2) Select Vector> Geoprocessing> Merge By Feature> By All Features ... and create a polygon; 3) Polygons in line and you get the desired result ... – Cyril Mar 18 at 7:31

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