大地基准面
- 网络Datum;Geodetic datum
![大地基准面](../cache/1335668.jpg)
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这个椭球面的中心和方位就构成了我们所说的大地基准面。
The center and orientation of the ellipsoid is what we call the datum .
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所以大地基准面定义了一个椭球面,并通过大地上的一组测量点与这个椭球面关联起来,从而定义了地球的中心。
So the datum defines an ellipsoid and through the use of a set of points on the ground that we relate to points on the ellipsoid , we define the center of the Earth .
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最常见的大地基准面是WGS84,这也是现在GPS系统所使用的基准面。
The most well-known is WGS84 used by the GPS systems today .
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影响夷平面形成的主要因素有前期大地构造、侵蚀基准面、气候、岩性、时间和后期构造运动等。
We strengthen the investigation of natural factors such as pre-construction , erosion base level , climate , lithology , time and tectonic activities , which affect formation and preservation of planation surface .