Hi, I may suggest the very painful but incredibly useful reading of Numerical Ecology or Numerical Ecology with R by Pierre Legendre et. al.
Nicolas Cadieux https://gitlab.com/njacadieux > Le 27 mars 2021 à 18:28, chris hermansen <[email protected]> a écrit : > > > Milena and list, > >> On Sat, Mar 27, 2021 at 11:20 AM Milena Muehler <[email protected]> >> wrote: >> Dear community, >> >> as an absolute beginner I try to explain my issue and intension. >> >> So I have several raster layers (population density; livestock density; >> mammal density; etc.) and two text layers (so I've imported two csv files >> with longitudes and latitudes into QGIS and now I have points about the >> location of large airports and location points where there was a zoonotic >> infectious disease outbreak). > > Please be aware that it is difficult or impossible to defend the claim that > some data (like human population density for example) has any kind of > Gaussian-like spatial distribution. With data like this, turning it into a > raster and thinking of the interpolated values as suitable for combining with > other supposedly continuous data may be very difficult to justify. > > This conversation > https://www.researchgate.net/post/Which-are-the-sufficient-conditions-for-Kriging-estimation > has a nice compact discussion of the kinds of assumptions that underlie the > application of kriging as a spatial interpolation technique. >> >> My intention is to „combine“ all layers and to get all the values under this >> specific point of an outbreak. So that I have the exact value of the >> population density, livestock density ans so on where the outbreak occurred. >> I guess I have to make the calculation within a certain vicinity though. > > You should probably first carry out some spatial statistics on the data that > resulted in your raster layers to make sure any "combination" of the layers > actually explains something. > > Oops I see Nicolas Cadieux also had something to say about this. > > > > -- > Chris Hermansen · clhermansen "at" gmail "dot" com > > C'est ma façon de parler. > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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