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Reference.org
Free-air gravity anomaly
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<p>In <a href="/facts/Geophysics/ywVQ1sAQ">geophysics</a>, the free-air gravity anomaly, often simply called the free-air anomaly, is the measured <a href="/facts/Gravity_anomaly/FDCnSSfx">gravity anomaly</a> after a free-air correction is applied to account for the <a href="/facts/Elevation/h2d0u9nd">elevation</a> at which a measurement is made. It does so by adjusting these measurements of gravity to what would have been measured at a reference level, which is commonly taken as <a href="/facts/Mean_sea_level/mDhuI7Xe">mean sea level</a> or the <a href="/facts/Geoid/6aR04HQl">geoid</a>. </p>