Which is your workflow to produce soil CO2 maps (or generally contour maps) with the Geostatistical analyst tool in arcGIS?
Do you use the semi-variogram generated by the tool or do you import it from other software?
Dear Marco,
Interpolation techniques generally and specifically the ArcGIS Geostatistical Wizard produce raster maps (which later can be converted to contour maps, but what for).
If you have enough and quality data (spatially representative etc.), which more or less fulfil the basic geostatistical requirements, you can rely on the tools provided by Geostatistical Analyst, semivariogram can be also modelled on advanced level.
What would be very interesting, once you have a raster map of CO2 in soil, would be to measure the rate of change from different times (Delta CO2/time). This will allow you to answer the following question: Where is the soil gaining CO2 and where is it loosing it? And possibly infer why or do some spatial regression analysis to try to find an explanatory variable. That is much easier done with raster maps than contour maps.
Dear László Pásztor, thank you for your answer.
Concerning the semivariogram, do you usually use the same arcgis tool, or you produce it with another software?
Dear Miguel Pavon, thank you too for the answer.
Your, is a good idea, but I've done just one field campaign, so I'm now working on these data.
Dear Marco,
In our Lab we use three different platforms for spatial analysis including geostatistical interpolation: ArcGIS, SAGA and R. All of them has its own advantages and disadvanteges. But the process is always carried out within one environment. If we krige in ArcGIS, we also model the semivariogram with ArcGIS Geostatistical wizard.
Best,
László
Personally, contouring in Surfer and importing into ARCGIS is cool.
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