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The Study on GIS Spatial Model Base Using COM Technology

ZHANG Wen-jiang 1) , CHEN Xiu-wan 1) , LI Jing 1) , LI Xiao-juan 2) , WU Huan 1) 1) (Inst. of RS&GIS at Peking University, Beijing 100871) 2) (Dep. of Geography, Capital Normal University, Beijing 100037)  
One important advantage of Geographical Information System (GIS) is its spatial analyses. According to researches and applications, the best way to implement the spatial analyses is to use the tool of model. However, many GIS systems lack spatial model base in different degrees, which in a sense constrains the spatial analysis ability of GIS. But different from common models, the spatial models must cope with and operate complex spatial data that bring many specific difficulties. So the development of spatial model is very slow compared with that of GIS applications and the related requirements. Introducing the COM technology, this paper studies the reusable spatial model base that is independent to specific applications. Then, based on the study a model base frame is advanced and its implementation is discussed. Our study shows that introduction of COM technology into GIS spatial model base, not only can enhance the reusability of GIS software, but also can help the realization of GIS spatial analyses. Because of the complexity brought by the spatial data, more issues remain to be further studied.
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