| Citation: | Zukuan Wei, Jaehong Kim, Haeyoung Bae. Fast Web-Based Data Transmission. Journal of Earth Science, 2001, 12(2): 165-176.
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Since web-based GIS processes large-size spatial geographic information on internet, we should try to improve the efficiency of spatial data query processing and transmission.This paper presents two efficient methods for this purpose: division-transmission and progressive-transmission methods.In division-transmission method, a map can be divided into several parts, called "tiles", and only tiles can be transmitted at the request of a client.In progressive-transmission method, a map can be split into several phase views based on the significance of vertices, and a server produces a target object and then transmits it progressively when this spatial object is requested from a client.In order to achieve these methods, the algorithms, "tile division", "priority-order estimation" and the strategies for data transmission are proposed in this paper, respectively.Compared with such traditional methods as "map total transmission" and "layer transmission", the web-based GIS data transmission, proposed in this paper, is advantageous in the increase of the data transmission efficiency by a great margin.
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