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几何位置资源航天器相对于地球表面的高度是一种十分重要的资源。人站在地面上,即使天气再好,视野再开阔,目力所及也就是几十千米;乘飞机能看到至多是方圆数百公里的地方。而在离地球200千米轨道上的人造卫星,可以看到14%的地球表面,在距地面35786千米的地球静止轨道上的航天器,则可以观察到42%的地球表面。这种几何位置是一种宝贵的资源。今天,人类发射到这一高度的通信卫星,其气象、导航定位、对地观测等各种服务,给信息社会插上了腾飞的翅膀。
Geolocation resources The height of the spacecraft relative to the earth’s surface is a very important resource. People stand on the ground, even if the weather is no better, the vision will open up again, and the sights will reach tens of kilometers; planes can see up to hundreds of kilometers. In the satellite orbiting 200 kilometers away from the earth, 14% of the earth’s surface can be seen. In the spacecraft on the geostationary orbit of 35,786 kilometers above the ground, 42% of the earth’s surface can be observed. This geometric position is a valuable resource. Today, humans have launched communications satellites at this height, and their various services, such as weather, navigation and positioning, and earth observation, have given rise to the information society.