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。
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。
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。
Based on MAPGIS, this paper introduces concept and operation of map layer and chiefly describes how to divide map layer and significance of dividing map layer.
文中结合MAPGIS介绍了图层的概念、图层操作，并重点阐述了如何划分图层及图层划分意义。
The spatial information system consists of 8 logical map layer series, 16 types of map layers, more than one hundred types of map units. Based on these data, 5 achievement maps have been compiled.
空间信息系统包括8个逻辑图层集，16个图层类型，百余个图元属性类型，在此基础上编制了5张成果图件。
The spatial information system consists of 8 logical map layer series, 16 types of map layers, more than one hundred types of map units. Based on these data, 5 achievement maps have been compiled.
空间信息系统包括8个逻辑图层集，16个图层类型，百余个图元属性类型，在此基础上编制了5张成果图件。
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