Spatial interpolation in QGIS

This video demonstrates how to intepolate point vector data to raster using two methods in QGIS. First nearest neighbour interpolation is used, which creates so-called Thiessen polygons. The second interpolator we used is the IDW method. Results are compared and discussed.

(c) OpenStreetMap Contributors

[abhinavsharma]

I've done my bachelor's dissertation using both interpolation methods. Your videos were really helpful for me during those times. I want to thank you.

[ron]

As always - a very helpful, well-explained video, thanks!

[Oldtboot]

Hans, ontzettend bedankt voor de duidelijke en informatieve filmpjes! :)

[mageshnagarajan]

This is very useful video. I am not aware of the dataset or problem being studied. Wish there was a very brief intro of the dataset or an example problem.
Thank you once again for your video

[gutoofosman]

Thanks very much for the useful tutorial. Can we edit the extent of the raster layer when choosing the Nearest neighbor interpolation method?

[debsguerreiro]

I really like your explanations, thanks

[nbrahmareddy]

good wishes sir

this tutorial was awesome as usual
can i know how to use theissen polygon for finding Avg. DIALY rainfall by having the data of annual rainfall at each station using QGIS ?
please tell me or give me any tutorial link sir

[MuhammedSankareh-gp]

Hi，my interpolated surface consist of squares and when extract by study area, it does not perfectly follow the boundary.

[kuzivakwashepatricknyarugw]

Can you explain further on the use of adiabatic lapse rate for areas with differential Elevation profiles

[زهراءمسيرناصر]

ERROR 6: Unable to set GeoTransform, SAGA binary grids only support the same cellsize in x-y.

[tyeasmin]

Hi Hans, Thank you so much for making these video tutorials. I had zero knowledge on QGIS or GIS software, now I am learning from your video lessons. However, after upgrading the QGIS version from 3.10 to 3.12, I am having trouble opening and every time I am getting error message. Such as "2020-04-09T11:10:35 WARNING Python error : Couldn't load plugin 'wntOS-3' due to an error when calling its classFactory() method See message log (Python Error) for more details. 2020-04-09T11:10:52 INFO Executing" Could you please help me to resolve this issue? Appreciate your time and help. Thanks

[mdamanurrahman]

In nearest neighbour interpolation, after calculating whole area interpolation i couldn't able to run the cliped by mask layer algorithm for my specific area. how to do that?

[زهراءمسيرناصر]

ERROR 6: Unable to set GeoTransform, SAGA binary grids only support the same cellsize in x-y. (This error appear)

[Simgiov]

Hi, how do you set the raster definition when using IDW? The output gives me pixels that are circa 650x650 meters by default which is not enough for my analysis. I don't see any option in the UI to set the grid spacing

[muhammadanjum]

Dear Sir, Your videos are excellent . Please help me a
video that How can I do in QGIS, to take the spatial average of all the pixels
from the climate data (like maximum temperature or minimum temperature or
rainfall) that lie inside of the boundary of each district using 'Zonal
Statistics as Table' to calculate the average of the given climate variable
within each boundary.

[vinay]

How to create a Geospatial mapping of water quality?

[sambulisiwemaseko]

@Hans van der Kwast Very useful video indeed. I am trying to interpolate rainfall data. I however have an error 4 message: does not exist in the file system, and is not recognized as a supported dataset name. Please help

[bart-jandekker]

Hi Hans, I want to try the "Grid Inverse distance to a power", but the option isn't in my menu. (I have just installed 3.12.3). I do have the other three options (moving average, data metrics, nearest neighbour). Also missing are the bottom two, TPI and TRI. Do you have any idea how to solve this..?

[farshadsh]

Hi, I have a problem with the TIN. I just started using QGIS because I no longer have access to ArcGIS. I want to create a lake bathymetry map from depth survey points. I created a polyline and converted it to a polygon so I can contain the interpolation within the shoreline boundary but when I run the TIN, it does not recognize the shoreline polygon as the extent and it interpolates out of that. What is wrong?

[clothildesaintmarc]

Hello, i have an error message when i run the function : "Failed to find field Z on layer TEST, skipping.
Le processus a renvoyé le code erreur 1"