# 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>]
                    [-nomask] [-mask <filename>]
                    [-interp {inv_dist,nearest}]
                    [-of <format>]
                    <srcfile> [<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.

--help

  Show this help message and exit

--help-general

  Gives a brief usage message for the generic GDAL commandline options and exit.

-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.

-mask <filename>

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

-of <format>

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

-interp {inv_dist,nearest}

  New in version 3.9.

  By default, pixels are interpolated using an inverse distance weighting (`inv_dist`). It is also possible to choose a nearest neighbour (`nearest`) strategy.

<srcfile>

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

<dstfile>

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