So, I have a question pertaining to the effect of latitude on a gravity survey a

Question

So, I have a question pertaining to the effect of latitude on a gravity survey and knowing the accuracy of latitude points to ensure readings are accurate to a certain _ mgal. I was reading the notes from this website - http://appliedgeophysics.lbl.gov/gravity/grav22.pdf - and was specifically interested in the section under latitude. It says: "Equation 2.1 may be used to derive a formula for the change in gz as one moves from north to south along a line of latitude. For a change in distance ds the approximate expression is: dg/ds ? 1 x dg/d? ? 1.307 sin 2? mgal/mile or 0.817 sin 2? mgal/km At a latitude of 45

Explanation / Answer

ANswer:- i hope it helps you The least count is to be brought to 0.01mgal. But the approx measured value = 0.817 mgal per kilometer, or 1000meter To bring down the least count, the required change in distance= 1000m / 0.817 * 0.01 =12.24 meters Which is equal to 12m approx.

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