A taxonomy of spatial units in a mixed 2D and 3D cadastral database
The aim of this paper is to define the range of objects that may need to be accommodated in the development of a practical cadastral database, to also accommodate 3D spatial units, and permit a range of encodings to coexist. The level of geometric encoding as defined in the ISO19152 LADM provides a framework of categorization of spatial units recorded in a cadastre, whether formal or informal, historic, current or planned. The levels of encoding range from simple “text based” spatial unit to the “topology based” encoding (in both 2D and 3D).