| Summary: | 碩士 === 國立臺灣大學 === 建築與城鄉研究所 === 81 === For the spatial planning professionals, especially geoscien-
-tists, it is very often that they have to deal with tremendous
and complicat- -ed three-dimensional geographical information
when performing their tasks in spatial planning. However, the
representation of three dimensional objects and their data
orga- -nization can not effectively proce- -ssed by traditional
Geogr- -aphical Information Systems (GIS) which are based on
two dimen- -sional data model. How to develop a three
dimensional geograph- -ical data model in order to effectively
support spatial data manipulation and analysis is thus an
important task to a spatial vector-based geographical data
model that can represented three dimensional topological
relationships in order to conquer the difficulty of
representing physical three-dimensional objects by two
dimensional data models, and to connect the shortcoming of grid-
based three dimensional data model in representing the spa-
-tial relationships among objects. In this research, in additon
to the topology of two dimensi- -onal geographical data model
and the recording method of spatial relationships of objects
and coordinates, TIN models are reviewed and applied. Based on
the reviewed methods , a vector- -based three dimensional data
model is developed. It is hoped that the proposed three
dimensional data models should be able to effectively represent
three dimensional objects and their topology, so that spatial
data can be efficiently retrived and analyzed. Pseudo-code of
the proposed data model is also provided in this paper.
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