UPDATING TOPOGRAPHIC MAP IN SOUTHERN CHINA BY USING SATELLITE IMAGE AND ANCILLARY DATA

摘要

A study was made to develop a method for updating land use information in topographic maps by using satellite images together with old maps in the rapid developing area of Zhong Shan in southern China. The method consists of three main parts: region-based segmentation of a satellite image, preclassification of the segments based on their spectral properties and rule-based postclassification. In the rule-based postclassification, the preclassification result is combined with information derived from old maps by using the Dempster-Shafer theory of evidence for hierarchical cases. The method was tested in the Zhong Shan area by using a Landsat TM image and an old topographic map. In determining rules and belief values, field measurements were used in addition to the data itself. The rule-based postclassification improved the classification results and the information of the old map proved to be useful in interpretation of land use classes which are near each other in the spectral space. The biggest problem was the spatial resolution of the Landsat TM image, which was too low to detect some small but very important features of the study area.