Methods & Procedures for Modeling Earth's Gravity Field

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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
 
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We need to see some of your ideas first, we can't 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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