[gdal-dev] Wondering gdal_grid moving average interpolation

[Ari Jolma]

On 13.03.2018 09:54, Rutger wrote:
> It looks alright to me. The moving average algorithm searches (for each
> pixel) for points within the specified radius, and then averages the values
> of all those points.
>
> "gdal_grid" also supports inverse distance or linear interpolation if you
> want a more smooth result.
>
> It is perhaps surprising that QGIS only exposes a small subset of
> gdal_grid's capabilities.

Yes, you're right, I was just a bit flabbergasted that it looked so bad. 
There's nothing to make it smooth.

The QGIS "bindings" to GDAL are a bit limited, perhaps there hasn't been 
much interest in expanding them from the initial commits(?). I believe 
there are also some things that could be thought as bugs - I did a PR(*) 
a year ago which was not merged (but the issue has been fixed since) - I 
think a good review of them would be useful. I fixed one issue 
recently(**) but it is a rather slow process.

Ari

*) https://github.com/qgis/QGIS/pull/4220
**) https://github.com/qgis/QGIS/pull/6564