How can I remove the white interstices on the edges (and interior) of a polygone or polyline, as represented in the first figure below? I want to get smooth and continuous edges, capturing the global external shape, as represented by the red line in the second figure below. Also, I want to keep the big white interiors.
I've tried the following methods, none of them being sucessful:
- convex hull (vector, geoprocessing tools)
- v.generalize.simplify (GRASS)
- Simplipy plugin
I used different generalisation algorithms, such as Douglas-Peuker, which I think is not suitable for this problem.
I work with QGIS 2.18.4 runing on Windows 10.