I'm wondering what are the plans for the FFT Convolution Filter plugin. It turns out to be useful for DEM smoothing before generating contour lines for an orienteering map.
This patch makes the filter work with QGIS 3. There is still an outstanding bug occasionally making the filter turn the DEM grid upside down in some cases. The root cause is not yet fully understood but it has something to do with change of raster affine transformation.
I'm wondering what are the plans for the FFT Convolution Filter plugin. It turns out to be useful for DEM smoothing before generating contour lines for an orienteering map.
This patch makes the filter work with QGIS 3. There is still an outstanding bug occasionally making the filter turn the DEM grid upside down in some cases. The root cause is not yet fully understood but it has something to do with change of raster affine transformation.