Geoscience Reference
In-Depth Information
Fig. 3
Prototype system based on the LADM standards
Fig. 4
Relationship between LADM, DHE and 3D spatial model classes
According to LADM standards ISO 19152, all classes of LADM inherit from
VersionedObject. 3D parcel is stored in the 3D spatial model and similar to Ying et
al. (
2011
) proposed prototype system, 3D land parcel and 3D legal spatial building
unit are two conceptual classes for 3D space representation by 3D spatial model.
In this research focus is on the 3D topological representation. Ying et al. (
2011
)
in their chapter mentioned that topological and geometrical information have to
be considered together to fulfil requirements of LADM and they mentioned that
two manifold solid model based on the LADM standards is insufficient for the real
world 3D cadastre. They proposed their prototype system based on the Sketch up
data structure which uses half-edge data structure. Boguslawski et al. (
2011
) in
their chapter described advantages of DHE over half-edge data structure for 3D
modelling (See
Sect. 3)
.
As can be seen in Fig.
4
, three classes have been designed: LADM, DHE and
3D spatial model. 3D spatial model (Fig.
5
) is modelled based on the DHE data
structure and DHE is connected to the LADM class. By selecting each parcel,
geometrical and topological information associated to the interested parcel can be
retrieved from databases.
Each parcel is considered as a cell which has geometrical and topological
information stored in the database. In the concept of DHE data structure each cell
will be treated as a primal model (parcel) which is connected to the other cells
(parcels) using dual model concepts. Adjacencies between rooms are considered
as an important aspect of this research which is important in cadastre. Each room
is considered as a cell which several attributes can be defined for each cell such
