<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div><br></div><div>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.</div><div><br></div><div><a href="https://gdal.org/programs/gdalinfo.html">https://gdal.org/programs/gdalinfo.html</a><br><br><div dir="ltr">Nicolas Cadieux<div><a href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></div></div><div dir="ltr"><br><blockquote type="cite">Le 9 juin 2022 à 10:33, Thibaut Bouveroux via Qgis-user <qgis-user@lists.osgeo.org> a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>Hi everyone,</span><br><span></span><br><span>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.</span><br><span></span><br><span>Thanks a lot for your assistance,</span><br><span></span><br><span>Best,</span><br><span></span><br><span>Thibaut</span><br><span></span><br><span>_______________________________________________</span><br><span>Qgis-user mailing list</span><br><span>Qgis-user@lists.osgeo.org</span><br><span>List info: https://lists.osgeo.org/mailman/listinfo/qgis-user</span><br><span>Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user</span><br></div></blockquote></div></body></html>