Feature request: spatial explicite covariates

[hambrecht]

I would like to include spatial explicit covariates when using make.population.description.

Currently, make.population.description only accepts a list for describing covariates, which works well for categorical variables like sex or cluster size. However, it does not accommodate environmental variables such as canopy cover or habitat type, which are spatially explicit.

I propose providing an n-dimensional raster layer that contains these spatial explicit covariates. When make.simulation or run.survey is executed, the relevant covariate values should be retrieved based on the location of each individual.

This enhancement would enable the simulation of the impact of different environmental conditions during surveys on density estimates.