How to fill no data cells in QGIS
Fill nodata values using interpolation in QGIS
In some cases, you may want to fill nodata values by interpolating from surrounding data. The ‘Fill nodata’ tool in QGIS allows you to do this:
o to ‘Processing’ - ‘Toolbox’ to open the ‘Processing Toolbox’.
In the search bar, type ‘fill nodata’ and select the ‘Fill nodata’ tool under ‘GDAL’ - ‘Raster analysis’.
Choose the input raster layer and set the output file.
Set the ‘Radius’ parameter, which defines the maximum distance (in pixels) to search for valid pixels to use in interpolation. The default value is 0, which means that the search radius is automatically calculated.
Click ‘Run’ to fill nodata values using interpolation from surrounding valid data.