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6

You can convert your clouds and shadows to null / no data and then interpolate those "null areas" based on the surrounding values using the Fill nodata tool, see the documentation here: https://docs.qgis.org/2.8/en/docs/user_manual/processing_algs/gdalogr/gdal_analysis/fillnodata.html Additionally, there is a "fill gaps" tool. https://grass.osgeo.org/...


3

You can also do it in one step without replacing values with NULL values. Use the SAGA provided Majority filter for that: http://www.saga-gis.org/saga_tool_doc/2.2.0/grid_filter_6.html http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Majority_filter


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