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 http://gis.orasecom.org/layers/geonod..., (c) OpenStreetMap Contributors
QGIS version: 3.22
Plugin: SmartMap https://github.com/gustavowillam/Smar...

Stepbystep tutorial is freely available at GIS OpenCourseWare: https://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 (SmartMap plugin)
10:45 Compare results
12:42 Render contour lines
13:52 Calculate contour lines

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