Abstract
Spatial data model is a key factor in GIS research. Traditional spatial data models based on Euclidean geometry frameworks are limited in terms of unifying space-time and different objects of different dimensions owing to the complexity associated with calculating topological relationships. Thus, a new spatial data model based on geometric algebra (GA-based spatial data model) is developed, which introduces GA into the spatial data model by using multidimensional vectors to unify space-time and multidimensional objects. To link traditional spatial data models and GA-based spatial data models, in this paper, a GA-based spatial data description language (GASDL) is proposed. GASDL is based on the Extensible Markup Language (XML), and it mainly describes data in terms of geometry, topological relationships and properties. GASDL considers the characteristics of both the traditional spatial data model and the GA-based spatial data model. By using GASDL, data can be imported and exported between traditional spatial data models and GA-based spatial data models. Thus, GIS software applications that use traditional spatial data models and GA-based data models can be connected.
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