Youliang Chen

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—Nowadays spatial relationships are widely used in more and more aspects in Geographic Information System. However, in the process of spatial database updating, due to updating period inconsistent of spatial objects, there often lead to spatial conflicts. In addition, in the field of computer cartography, map data are usually derived from a source that is(More)
Displaying map data at scales smaller than its source can result in objects that are either too small to be seen or too close to each other to be distinguishable. Furthermore, map conflicts become more likely when certain map symbols are no longer a true scale representation of the feature they represent. Map generalization involves careful examination of(More)
The PoYang Lake is the largest fresh lake in China, also a national famous place of commodity grain. But on the other hand, flooding disaster happens frequently, and the economic loss caused by flood is extremely huge. In order to reduce the loss caused by the flooding disaster, it is necessary to monitor the flood disaster situation in PoYang Lake area.(More)
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