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The 3rd ISPRS Workshop on Dynamic and Multi-Dimensional GIS & the 10th Annual Conference of CPGIS on Geoinformatics
Chen, Jun

ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS", Bangkok, May 23-25, 2001
From the legal perspective, cadastral data can not be modified
without permission. However, static historical states (such as
snapshots) can be changed by editing or other methods. In the
composite model, all historical data except initial states are
dynamically except initial states are dynamically created in
memory. Besides, users login IDs and their passwords can be
set in historical data tables as other attribute tables of the
relational database. In other words, when the initial cadastral
state is reinstated to the state at the time given, only authorized
users can access the current cadastral state. Otherwise, users
can not trace back previous states at all, even less change
cadastral data. If initial cadastral data are modified without
system access, the retrievable chain is broken and all updated
data are not stored into the database.
The described above indicate the importance of the
spatio-temporal data model in CIS. Almost every step of
cadastral management concerns the temporal problem. The
intention of the work described here has not been to develop a
full functional GIS platform, but to design and implement a
temporal data model on the basis of the current GIS platforms to
support spatial and temporal applications. Taking an example of
Cadastral Information System for Wenzhou city, the composition
temporal data model, which has little redundant storage, quick
historical retrieval and security of storing data, can meet the
practical need of temporal Cadastral Information System.
In this chapter the composition temporal data model
focuses on the management of vector spatio-temporal data and
is adaptable to the situation where changes are frequent or there
exist many asynchronous changing data items and applications
concentrated on micro contacts and micro status discovery at a
moment, future research will be the further development of
raster types and the studying of macro changes about
geographical phenomena.
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