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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004 
  
algorithms and programs for different changes will be different 
too. If the types of spatial changes (including geometric and 
topological) to each events can be known, and can be identified 
automatically, the updating operation of the spatio-temporal 
cadastral database can be formulate automatically, the 
automation of cadastral database' updating can be realized too. 
Based on this idea, a new incremental updating approach of 
cadastral database named as Events-Based Incremental Updating 
of Cadastral Database (EBIU-CDB) is proposed in this paper. 
In cadastral system, any changes in size (or shape) of a parcel 
could affect changes in the topological relationship between this 
parcel and other parcels, e.g., an enlargement of a parcel will add 
new nodes (comers or boundary points) and links (arcs or 
boundary lines connecting these points) to its boundary such that 
its topology becomes different from what it was before. In order 
to distinguish the topological changes, the topological 
relationship between parcels must be described at first. In 
addition, in order to formulate the updating operations, a set of 
dynamic operators of spatio-temporal database (STDB) must be 
given at first. 
The remainder of this paper is structured as follows: the 
definition of land subdivision events and the strategy of 
cJ 
section 4; the changes of split event is presented in section 5. The 
updating algorithm and program of split event is presented in 
Section 6. The summary is given in section 7. 
2. STRATEGY OF EBIU-CDB 
A land subdivision event is an occurrence causing the parcels’ 
state change (geometric or thematic). Usually the geometric 
changing land subdivision event can be divided to four 
fundamental cases: (a) split, division of a zone into 2 parts; (b) 
union, fusion of 2 zones into a single entity; (c) reallocation, 
reallocation of land covered by ‘n° initial zones to form ‘p’ new 
  
A] B 
  
  
  
  
  
(a) (b) 
   
(d) Modification of 
(c) Reallocation 
the common border 
Fig.1 Fundamental land subdivision 
Topological relationship between parcels 
  
  
  
Spatial and topological change types 1 
  
  
  
  
EBIU-CDB is presented in Section 2; the topological 
ctum Split 
ETT 
  
  
  
  
Spatial and topological change types ml 
  
  
  
  
  
Spatial and topological change types 1 
  
  
Union 
  
  
  
  
  
Spatial and topological change types m2 
  
  
Danamic 
  
  
  
  
Modification of the 
Spatial and topological change types 1 
operations 
  
  
  
  
  
$juaA3 uorstArpqns pueT 
  
common border 
  
  
  
  
  
  
Spatial and topological change types m3 
  
  
  
  
  
  
  
Disappearance 
  
  
Input changed 
  
    
Reallocation data 
  
Pre-treatment 
of spatial data 
Appearance 
  
  
nd 
NS Overlapping! 
Overlapping2 
Fig. 2 Strategy of EBIU-CDB 
relationships between two parcels are described in section 3; a set 
of dynamic operators of spatio-temporal database is presented in 
zones; (d) modification of the common border, the case of land 
767