[Qgis-user] raster layer combination

[Nicolas Cadieux]

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 <clhermansen at gmail.com> a écrit :
> 
> 
> Milena and list,
> 
>> On Sat, Mar 27, 2021 at 11:20 AM Milena Muehler <milena.muehler at gmx.de> 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
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20210329/ff1f72d3/attachment.html>