latitudinal bias in sample points created with r.random
|Reported by:||pvanbosgeo||Owned by:|
Point patterns generated with r.random show a strong latitudinal bias, with considerably higher density at higher latitudes.
The attached screenshot illustrates this. It shows the sum of number of points in a moving window (21x21 - created with r.neighbors.
This is fairly serious because especially at lower sample densities, one may not always notice this bias, thus introducing unknowingly such bias in analysis.
Note that points created with v.random do no show a bias. However, this is not really an alternative for creating random points within a irregular area.