[Qgis-user] Interpolation analyses

[Nicolas Cadieux]

Hi,

It would help if you gave what algorithms you are using.  There is a Gdal and a QGIS idw interpolation method and they are not working the same way.  Also, QGIS has a quick way of determining the min max value that are an estimate of the true values.  Use Gdal info with flag -stats to get the true values.  You will find that in the processing plugin.

https://gdal.org/programs/gdalinfo.html

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 9 juin 2022 à 10:33, Thibaut Bouveroux via Qgis-user <qgis-user at lists.osgeo.org> a écrit :
> 
> Hi everyone,
> 
> I am trying to make an IDW interpolation analyses using salinity data in a bay. My values ranges between 0.1 to 13.1 PSU. When making my interpolation with 148 data points, the interpolation output ranges between 0.0034 to 12.40 and so doesn't fit 100% with the dataset. Can someone has na idea why? Using the same data set in ArcMap, the interpolation I made ranged between 0.1 and 13.1 and does fit 100% with my dataset.
> 
> Thanks a lot for your assistance,
> 
> Best,
> 
> Thibaut
> 
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