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As the combination point of the network technology and GIS technology, WebGIS has got the fast development in
recent years. With the restriction of Web and the characteristics of GIS, traditional WebGIS has some prominent
problems existing in development. For example, it can't accomplish the interoperability of heterogeneous spatial
databases; it can't accomplish the data access of cross-platform. With the appearance of Web Service and Grid
technology, there appeared great change in field of WebGIS. Web Service provided an interface which can give
information of different site the ability of data sharing and inter communication. The goal of Grid technology was to
make the internet to a large and super computer, with this computer we can efficiently implement the overall sharing of
computing resources, storage resource, data resource, information resource, knowledge resources and experts resources.
But to WebGIS, we only implement the physically connection of data and information and these is far from the enough.
Because of the different understanding of the world, following different professional regulations, different policies and
different habits, the experts in different field will get different end when they observed the same geographic phenomenon
and the semantic heterogeneity produced. Since these there are large differences to the same concept in different field. If
we use the WebGIS without considering of the semantic heterogeneity, we will answer the questions users proposed
wrongly or we can't answer the questions users proposed. To solve this problem, this paper put forward and experienced
an effective method of combing semantic grid and Web Services technology to develop WebGIS. In this paper, we
studied the method to construct ontology and the method to combine Grid technology and Web Services and with the
detailed analysis of computing characteristics and application model in the distribution of data, we designed the WebGIS
query system driven by ontology based on Grid technology and Web Services.
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