SpPOP_linear1           Generation of spatial population along with
                        spatially varying model parameters generated
                        based on linear function of latitudes and
                        longitudes
SpPOP_linear2           Generation of spatial population includes
                        multiple auxiliary variables along with
                        spatially varying model parameters generated
                        based on linear function of latitudes and
                        longitudes
SpPOP_linear3           Generation of spatial population along with
                        spatially varying model parameters generated
                        based on linear function of latitudes and
                        longitudes
SpPOP_linear4           Generation of spatial population along with
                        spatially varying model parameters generated
                        based on linear function of latitudes and
                        longitudes
SpPOP_linear5           Generation of spatial population along with
                        spatially varying model parameters generated
                        based on linear function of latitudes and
                        longitudes
SpPOP_nonlinear1        Generation of spatial population along with
                        spatially varying model parameters generated
                        based on non-linear function of latitudes and
                        longitudes
SpPOP_nonlinear2        Generation of spatial population along with
                        spatially varying model parameters generated
                        based on non-linear function of latitudes and
                        longitudes
SpPOP_nonlinear3        Generation of spatial population includes
                        multiple auxiliary variables along with
                        spatially varying model parameters generated
                        based on non-linear function of latitudes and
                        longitudes
SpPOP_nonlinear4        Generation of spatial population along with
                        spatially varying model parameters generated
                        based on non-linear function of latitudes and
                        longitudes
SpPOP_nonlinear5        Generation of spatial population along with
                        spatially varying model parameters generated
                        based on non-linear function of latitudes and
                        longitudes
