Dear community! I’m new to QGIS and hope you can follow my process and my question. Would be more than happy to get your help!
So I have a raster layer with a cumulative value for each raster giving information about land modification (in 2016) I have another vector layer with points providing information where an outbreak of a zoonotic infectious disease occurred (in 2016) I want to examine the effect / association between land modification and outbreak (I´ll do this with a binary logistic regression analysis in SPSS) therefore I want to generate a text file with values of the land modification for the location of the outbreak - I’ve done this with the tool "point sampling“. But I also need values of land modification located at the points „no-outbreaks“. (to calculate the binary logistic regression analysis later in SPSS) Therefore I’ve generated random points. However, these points are truly random :) So most random point „lay in the ocean“ and therefore I don’t get values of land modification. So my question: How do I deal with that? Can I give a kind of command that all random points have to lie on land? and to give a certain radius for the „not random“ points - outbreaks. someone said I can do this via raster calculator. But I cannot follow it, since I don’t calculate two raster layers?! I gave me this kinda command to deal with my issue: (via raster calculator?!) L = grid cell is on land B = Buffer around outbreaks with radius r (tbd: minimum distance between outbreaks and random non-outbreaks) D = L / B (difference "L without B „ = country on which a random non-outbreak can lay) Thank you so much!!!!!!! _______________________________________________ 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
