bio_grid                South-western Australia plant species richness
                        grid (GCF paper case study)
gcf_blocks              Spatial blocks for stability selection and
                        spatial cross-validation
gcf_field               Generate generalized covariate field (GCF)
                        variables
gcf_psi                 Spatial-pattern features (psi) of spatial
                        variables
gcf_reduce              Reduce psi and Zx layers to the GCF candidate
                        variables
gcf_select              Select stable GCF variables
gcf_zx                  Neighbourhood-distribution features (Zx) of
                        spatial variables
sim_grid                Simulated spatial grid (GCF paper simulation)
summary.gcf_field       Summarise a generalized covariate field
