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Thursday, July 20, 2017

kriging with QGIS

A brief HOWTO for geoscientists trying sort out kriging in one of QGIS's more recent versions (I'm using 2.18.10 with GRASS, downloads: https://www.qgis.org/fr/site/forusers/alldownloads.html).

The SAGA plugins are still installed, but are nowhere to be found - until the Processing plugin is activated:


Now you have a new Processing menu, where you can turn on the Toolbox like this:


 Giving you a new Toolbox over on the right (typical) side of your screen ... which even has a search function! Useful, since there are a LOT of different algorithms useful for us geotypes:

So now you have a full menu of geospatial algorithms, including those we've all studied in GIS courses using ESRI products; you can tweak the variogram model, block or cellsize (for different sampling resolutions).

One thing to note: these interpolations allow temporary files to be written, because we often "test and discard" our stat models. However if you don't remember to save your "good" interpolations as add them as a layer, when you quit - or, at least on my machine, QGIS crashes (all. the. time) - you lose your beautiful kriging. Attention.


That's it, perhaps en fran├žais later.

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