From: Analysis of local habitat selection and large-scale attraction/avoidance based on animal tracking data: is there a single best method?
iSSM predictors
ST-PPM predictors
hab
hab+log(dx)
hab+s(log(dx))
hab+cos(ta)
hab+s(cos(ta))
hab+log(dx)+cos(ta)
hab+s(log(dx))+s(cos(ta))
hab+log(dx)+cos(ta) + log(dx):cos(ta)
hab+te(log(dx),cos(ta))