I am working with water quality and other physiochemical components such as temperature, salinity, and nutrients and I would like o interpolate the data from sampling stations to illustrate the water quality distribution in different bay areas.
I am currently looking at IDW interpolation in QGIS 3.6, and it does a reasonably good job of the illustration, however, with a few stations affecting other bay area parameters, even if there is land between them. I would need to have some barrier between bays and lagoons so that stations from the red-marked area don't affect the green-marked area and vice versa.
Is there a tool in QGIS that can build barriers between bays and lagoons, so that the map "understands" that the water quality from green to red cannot affect one another directly?
Sampling stations = White dots on the map
Dear Stefan
Separate into two groups of stations. Turn interpolation in two steps.
Make sure you can use the breakline option in your case. Available in the Raster> Intepolation menu window next to the data type option, in this case, points.
Best Regards.
Hi Leônidas Luiz Volcato Descovi Filho
Thank you for your reply. So theoretically, I was to say have 100 bays I would have to separate the monitoring stations to represent each bay separately? So If I were to say that I have 200 stations and only two stations per bay area, this would not be sufficient data to illustrate the water quality gradient in the bay, right?
I'll see what I can do with this information, thank you!
Dear Dr Husa
QGIS interpolation will generate continuous surfaces. This will "mix" the values of the red and green circle bays and may mask the results.
One suggestion is to select the red bay stations and rotate it separately.
If there are many bays, you must rotate them separately. Unfortunately I do not know how to batch run geostatistics, but there must be this possibility.
Best regards
Very interesting question. So I must add a very unpopular answer (from my point of view)- Following!
Dear all, thank you for your responses.
I am currently running an analysis with the added break lines, which hopefully will solve the issue. The break lines was a new attribute which I had not yet considered, which, hopefully will solve the issue. However, the analysis is projected to take approximately 9 days, so I hope this is the right analysis.
Best,
Stefan
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