7
9
2010
37

GIS系统中使用的5种高度

1. 绝对高度absolute

绝对高度采用的是相对于海平面的值, 和地表的起伏变化无关, 可以将具有外形的元素放在地表以下, 这样的话这些元素就是不可见的.负值也是允许的, 可以将图形放在海平面下方.

2. 贴紧地表clampToGround
这种模式忽略掉高度值, 将图形放在地表上, 随地表高低而变化起伏.这种方式下, 地表的一些覆盖, 犹如轻纱覆盖在地表.如果图形放在了海面上, 那么它的起伏就会和海平面的起伏相同.

3. 贴紧海底clampToSeaFloor
和贴紧地表的模式相同, 这种模式忽略高度值, 它将图形贴紧在地形主体所有水的成分的下方, 如果地形上没有水, 那么它就贴紧地表.

4. 相对地表 relativeToGround

用相对于地表的坐标值来表示高度

举个例子, 这个高度可以被表示电线杆的顶端,这些电线杆分布在一座山上, 从山底到山顶. 如果每个电线杆都是20m高, 那么每根杆的顶端都将比地形表面高出20m

5.相对海底 relativeToSeaFloor

和相对地表类似.

如果图形放在了含水的地形上, 那么此模式用图形下方到海底的距离来衡量高度. 如果地形上没有水, 那么就以图形下方相对于地表的距离来衡量高度.

 

详见 Google KML 文档中对于Altitude的介绍

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