Dictionary:Zone chart

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{{#category_index:Z|zone chart}} A template for making terrain correction or isostatic corrections to gravity data. A zone chart (Figure Z-2) can be laid over a topographic map with its center at the station being corrected and the difference in mean absolute elevation between each zone and the station’s elevation tabulated without regard for sign (because the correction is always positive regardless of whether zones are higher or lower than the station elevation) to determine the terrain correction.