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[转载]太阳同步轨道

已有 4575 次阅读 2022-12-5 19:42 |个人分类:遥感专业知识|系统分类:科研笔记|文章来源:转载

Sun-synchronous orbit (SSO) is a particular kind of polar orbit. Satellites in SSO, travelling over the polar regions, are synchronous with the Sun. This means they are synchronised to always be in the same ‘fixed’ position relative to the Sun. This means that the satellite always visits the same spot at the same local time – for example, passing the city of Paris every day at noon exactly.

太阳同步轨道 (SSO) 是一种特殊的极地轨道。 SSO 中的卫星在极地地区上空运行，与太阳同步。这意味着它们是同步的，相对于太阳始终处于相同的“固定”位置。这意味着卫星总是在同一当地时间访问同一地点——例如，每天恰好在中午经过巴黎市。

This means that the satellite will always observe a point on the Earth as if constantly at the same time of the day, which serves a number of applications; for example, it means that scientists and those who use the satellite images can compare how somewhere changes over time.

这意味着卫星将始终在一天中的同一时间观察地球上的一个点，这有多种应用；例如，这意味着科学家和那些使用卫星图像的人可以比较某个地方随时间的变化情况。

This is because, if you want to monitor an area by taking a series of images of a certain place across many days, weeks, months, or even years, then it would not be very helpful to compare somewhere at midnight and then at midday – you need to take each picture as similarly as the previous picture as possible. Therefore, scientists use image series like these to investigate how weather patterns emerge, to help predict weather or storms; when monitoring emergencies like forest fires or flooding; or to accumulate data on long-term problems like deforestation or rising sea levels.

这是因为，如果你想通过拍摄某个地方的多天、数周、数月甚至数年的一系列图像来监控一个区域，那么在午夜和中午比较某个地方并不会很有帮助—— 您需要拍摄的每张照片都尽可能与上一张相似。因此，科学家们使用这些图像系列来研究天气模式是如何出现的，以帮助预测天气或风暴；在监测森林火灾或洪水等紧急情况时；或者积累关于森林砍伐或海平面上升等长期问题的数据。