r.surf.idw Surface interpolation utility for raster layers. Raster (r.*) QgsProcessingParameterRasterLayer|input|Name of input raster layer|None|False QgsProcessingParameterNumber|npoints|Number of interpolation points|QgsProcessingParameterNumber.Integer|12|True|1|None QgsProcessingParameterBoolean|-e|Output is the interpolation error|False QgsProcessingParameterRasterDestination|output|Interpolated IDW