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Gravity corrections- latitude correction

  1. Sep 26, 2008 #1
    i have i problem with many parts to it that the forums may be able to help me with. ive been given a scenario which involves gravity surveys along a path, in summary here it is:

    a gravity survey is taken at an initial latitude of 45 degrees and has an azimuth of 30 degrees.

    ive also been given a list of gravity data readings, but its not the problem. the question asks to apply necessairy corrections and i know latitude correction is one. my problem is how to determine the correction for each reading given. i know i have to draw a triangle from the start (45 degrees) and a line going out from there 30 degrees. i have found the distance ive traveled north when i travel along the azimuth.

    we have been given a correction formula: g= -8.108 sin 2 theta where theta is the given degree of latitude.

    at this point i am stuck. how do you find the correction for example if i move 25.98 meters in a north direction?
     
  2. jcsd
  3. Sep 26, 2008 #2

    Redbelly98

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    There is an equation for g vs. latitude at

    http://en.wikipedia.org/wiki/Earth's_gravity

    Scroll about 1/2-way down the page. Just after the section title "Mathematical models", you'll see the equation.

    p.s. Welcome to PF.
     
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