# gdal_fillnodata.py

Fill raster regions by interpolation from edges.

## Synopsis

    gdal_fillnodata.py [-q] [-md max_distance] [-si smooth_iterations]
                    [-o name=value] [-b band]
                    srcfile [-nomask] [-mask filename] [-of format] [dstfile]

## Description

gdal_fillnodata.py script fills selection regions (usually nodata areas) by interpolating from valid pixels around the edges of the area.

Additional details on the algorithm are available in the `GDALFillNodata()` docs.

`-q```

  The script runs in quiet mode. The progress monitor is suppressed and routine messages are not displayed.

`-md` `max_distance`

  The maximum distance (in pixels) that the algorithm will search out for values to interpolate. The default is 100 pixels.

`-si` `smooth_iterations`

  The number of 3x3 average filter smoothing iterations to run after the interpolation to dampen artifacts. The default is zero smoothing iterations.

`-o` `name=value`

  Specify a special argument to the algorithm. Currently none are supported.

`-b` `band`

  The band to operate on, by default the first band is operated on.

`srcfile```

  The source raster file used to identify target pixels. Only one band is used.

`-nomask```

  Do not use the default validity mask for the input band (such as nodata, or alpha masks).

`-mask` `filename`

  Use the first band of the specified file as a validity mask (zero is invalid, non-zero is valid).

`dstfile```

  The new file to create with the interpolated result. If not provided, the source band is updated in place.

`-of` `format`

  Select the output format. The default is GTiff – GeoTIFF File Format. Use the short format name.