Question about gravity (1 Viewer)

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the question is

"Provide an exhaustive list of methods/procedures for modelling and determining the earth’s gravity field at local, regional and global scales and the types of data requirement."

can anyone help to solve this problem, PLZ
We need to see some of your ideas first, we cant just do the problem for you. We help you help yourself :)
Actually, i don't know the different of local gravity filed and global gravity field.
It is quite confuse.

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