QGIS: How to create a groundwater contour map using the Thin Plate Spline (TPS) Interpolation

In this video I will show you how to quickly and easily interpolate a large groundwater level dataset using the *QGIS Thin Plate Spline (TPS)* Interpolation tool. We will create a smooth raster of the static water level data of the Tapi River Basin of India, and then create contour lines and groundwater flow direction arrows. Finally we will save the contours to a GeoPackage file and print a map to PDF using the A1 map template. You will need to install SAGA if you are using the new versions of QGIS: ► Link to SAGA installation Manual (PDF): https://bit.ly/Install_SAGA_in_QGIS_WIndows ► Link to SAGA installation video: https://youtu.be/ceBOzPtQvms Chapters 00:00 - 00:35 Introduction 00:35 - 01:11 Definition of groundwater levels 01:11 - 01:40 Thin Plate Spline interpolation method 01:40 - 02:33 Prepare the background map 02:33 - 03:54 Import static water levels 03:54 - 05:36 Thin Plate Spline interpolation 05:36 - 07:09 Extract the contours 07:09 - 07:25 Multipart to Singleparts 07:25 - 11:07 Edit contour line and label formats 11:07 - 13:24 Add groundwater flow direction arrows 13:24 - 14:32 Clip contours outside of the river basin 14:32 - 15:26 Inverted polygons to hide areas outside the basin 15:26 - 16:30 Export map to PDF 16:30 - 16:58 Final words Link to Manual: ► https://bit.ly/3ghPUeI Link to QGIS QML file for loading the 100m contour style: ► https://bit.ly/100mGWcontours Link to reference papers: ► https://cseweb.ucsd.edu//~sjb/pami_tps.pdf ► http://elonen.iki.fi/code/tpsdemo/index.html For more videos on QGIS, see the QGIS 101 Playlist: ► https://youtube.com/playlist?list=PLp1lK6n-xb5Pqm6JmiwORjm8vuK5g2yf1 #QGIS #ThinPlateSplineInterpolation #staticwaterlevelcontours