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I'm looking for a way to generalize and simlify polygon to remove "internal spikes" as ilustrated below. The violet in input and green expected poligon.

input polygon example expected output

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There's a few tools available for simplifying polygons:

  • Simplify geometries

    Processing Toolbox > QGIS geoalgorithms > Vector geometry tools
    

  • v.generalize.simplify

    Processing Toolbox > GRASS GIS 7 commands > Vector (v.*)
    

  • PolygonSimplifier

    Plugins > Manage and Install Plugins
    

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