@eva0marques Following up on the slope/aspect covariate discussion. I agree with you that the circular variable cannot be expressed linearly in a single variable, so we need two.
Here is an ArcGIS discussion on aspect. Note that 0 degrees in north. Hence, we can calculate the "Northiness" and "Eastiness" via a cos(deg2rad(aspect)) and sin(deg2rad(aspect)), respectively, as mentioned here.
@eva0marques Following up on the slope/aspect covariate discussion. I agree with you that the circular variable cannot be expressed linearly in a single variable, so we need two.
Here is an ArcGIS discussion on aspect. Note that 0 degrees in north. Hence, we can calculate the "Northiness" and "Eastiness" via a cos(deg2rad(aspect)) and sin(deg2rad(aspect)), respectively, as mentioned here.