r.fillnulls Fills no-data areas in raster maps using spline interpolation. Raster (r.*) ParameterRaster|input|Input raster layer to fill|False ParameterSelection|method|Interpolation method to use|bilinear;bicubic;rst|2 ParameterNumber|tension|Spline tension parameter|None|None|40.0 ParameterNumber|smooth|Spline smoothing parameter|None|None|0.1 ParameterNumber|edge|Width of hole edge used for interpolation (in cells)|2|100|3|True ParameterNumber|npmin|Minimum number of points for approximation in a segment (>segmax)|2|10000|600|True ParameterNumber|segmax|Maximum number of points in a segment|2|10000|300|True OutputRaster|output|Filled