I am having difficulty understanding the polar motion of the Earth. I am trying to understand terrestrial coordinate systems in geodesy. Then, there is idea of Conventional International Origin (CIO) and Greenwich mean astronomic meridian. Could anyone explain polar motion of the earth: its causes, and how it is measured.
How to understand the following polar motion plot?
The polar motion is one component of the Earth rotation, aside the variation in the length of day. It’s now measured by the space technology such as VLBI, GNSS, SLR. The motion is caused by the internal dynamic process and mass transport within the Earth systerm according to the conservation of angular momentum of the Earth.
Thank you very much Prof Changyi Xu .
How is the position of the Earth's pole at this moment (e.g. right now) described?
What are the reference point(s)/ reference direction(s)/ reference axes? Is it an angular or linear measurement(s)?
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