Derivation
variable: gpssdeg [GPS coordinate south degrees] (table[s]: val_village, crs_houseall, gp_gphhold)
variable: gpssmin [GPS coordinate south minutes] (table[s]: val_village, crs_houseall, gp_gphhold)
variable: gpsedeg [GPS coordinate east degrees] (table[s]: val_village, crs_houseall, gp_gphhold)
variable: gpsemin [GPS coordinate east minutes] (table[s]: val_village, crs_houseall, gp_gphhold)