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Relief correction
This correction is introduced in areas with very rough terrain, where the relief is sharply seen. The correction is always positive, since rocks located above and below the observation point equally reduce the observed value of gravity (Fig. 1):
Fig.1. Scheme describing the application of relief correction
In order to calculate the correction for the relief, it is necessary to have the elevation map of this area, as well as a special circular palette made on a transparent basis (Fig. 2).
Fig. 2. Palette for correction calculation
This palette is divided into sectors using circles and radii. The center of the palette is superimposed at the observation point and for each sector the approximate height value is taken from the map. Using special tables, the average value of heights determines the value of corrections for each sector, and then these corrections are summarized for all sectors.
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