Based on practice, introduces a way how to implement a dynamic showing of multilevel structure map and remark map by layer in homepage courseware.

基于实践，介绍了网页式课件中，利用层来实现多级结构图的演示及注释说明式图片的一种方法。

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The algorithm based on C Tree can complete the polygon selection and combination operation in high efficiency for given large scale polygon map layer and small output scale.

对于给定的大比例尺地图多边形图层数据，该算法可以高效率地完成多边形选取与合并的综合操作，输出小比例尺地图图层数据。

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Based on the request of the power supply, the functions include map-layer management, space query of equipment, record query and fast repair decision on accident etc.

系统功能包括图层管理、设备空间查询、事故抢修支持、设备管理、耗材管理、报表处理和实时数据管理。

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