Interpolate Groundwater Quality Data in QGIS (Thiessen, IDW, Kriging)

This video demonstrates how to interpolate groundwater quality data from a borehole point vector data set to rasters. Three methods were used: Thiessen polygons, Inverse Distance Weighting (IDW) and kriging. Results are styled and contour lines were visualised.
Open data: ORASECOM - gis.orasecom.org/layers/geonod..., (c) OpenStreetMap Contributors
QGIS version: 3.22
Plugin: Smart-Map - github.com/gustavowillam/Smar...
Step-by-step tutorial is freely available at GIS OpenCourseWare: courses.gisopencourseware.org...
0:00 Introduction and dataset
1:13 Import WFS data from GeoNode into QGIS
3.42 Remove nodata from data points
4:53 Interpolate with Thiessen method
6:11 Interpolate with IDW method
8:05 Interpolate with kriging method (Smart-Map plugin)
10:45 Compare results
12:42 Render contour lines
13:52 Calculate contour lines
#QGIS #QGISHydro

[@ark9255]

Great video. Thank you.

[@SheldonYegon]

Thank you for this.

[@1menitarcgispro512]

thanks

[@user-md9ib5hh2c]

Hi! Thank you for this... How could I reduce the RMSE?

[@HansvanderKwast]

Three ways: (1) more datapoints, so you can get a better fit, (2) try another interpolation method, (3) increase the accuracy of your datapoints.

[@skydockfootball]

How to solve connection not valid?

[@TheDinofou]

I've got this error when trying to interpolate "TypeError: disconnect() failed between 'currentIndexChanged' and all its connections Traceback (most recent call last): File "C:\Users/POSTE3/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\Smart_Map\Smart_Map.py", line 3810, in pushButton_Krigagem_clicked self.dlg.mMapLayerComboBox.currentIndexChanged.disconnect() TypeError: disconnect() failed between 'currentIndexChanged' and all its connections" I don't know how to solve this :/

[@HansvanderKwast]

For this, you need to get in touch with the developers of the plugin: github.com/gustavowillam/SmartMapPlugin

[@georgeringrose6826]

Did you ever find a solution to this as I have the same issue? Thanks

[@TheDinofou]

@@georgeringrose6826 unfortunately I havn't been able to make it work :( back to surfer haha

[@georgeringrose6826]

@@TheDinofou Thanks for letting me know. I'm going to keep looking for a solution and will update if I find one.

[@TheDinofou]

@@georgeringrose6826 best of luck !