基准面和投影释义~~

最新推荐文章于 2024-09-07 15:20:08 发布

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最新推荐文章于 2024-09-07 15:20:08 发布

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本文介绍了地理坐标系统的两个核心概念：基准面和投影。基准面通过近似地球形状为椭球体来定义地球的几何形态，而投影则描述了如何将三维椭球体映射到二维平面上。文中特别提到了WGS84这一全球广泛使用的基准面。

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The datum defines the shape of the earth by approximating it as an ellipsoid. Since the Earth isn't an ellipsoid, some datums are created to fit local areas with a small error, while others try to fit with an average of the whole Earth. The most popular one is the WGS84 (World Geodetic Datum 1984), which is used by the Global Positioning System. Having data in different datums can cause large shifts in the data, so having all your data in the same datum can be crucial. The last thing you should be aware of is the projection. The projection defines how the ellipsoid is mapped onto a flat piece of paper. There are a bunch of projections, some made to preserve angles, some preserve area, etc. 基准面和投影释义~~