Once the marker is added to the map as an overlay, the drawLine function is called.

将这个标记作为叠加层添加到地图上之后，调用drawLine函数。

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Spatial overlay is one of the most important spatial analysis functions in the Geographic Information System, and its efficiency will directly influence the whole function of GIS.

空间叠加是GIS系统必不可少的空间分析功能之一，空间叠加分析效率的高低直接影响到GIS整体功能的发挥。

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Reflective crack is one of major damage that the old concrete pavement has after restored by adding asphalt overlay and affects directly function and service life of mad usage.

反射裂缝是旧水泥混凝土路面沥青加铺路面的主要病害之一，直接影响了路面的使用功能和使用寿命。

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