I am developing models of benthic invertebrate abundance but am uncertain of the best way to treat the spatial data. I have lat, long, and depth. I thought about detrending, but then wouldn't I have to double detrend (first with respect to lat and long and second with depth)? Alternatively, would it make sense to just include the interaction of lat, long, and depth in the model as a covariable?
Thanks, Dan
