Free-Air Anomaly (Moving Platform)
Use the Moving Platform Gravity > Corrections by Steps > Free-Air Anomaly menu option (AGFREEAIR GX), to calculate the free-air anomaly by subtracting Total Correction (see the Application Notes below) from measured values of absolute Gravity from the L+R meter in mGal (Gabs).
Calculate Free-air Anomaly dialog options
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Input absolute gravity channel |
The input absolute gravity channel name. The default name is "AbsGravity". Script Parameter AGFREEAIR.INCH |
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Input Eotvos correction channel |
The Eotvos correction channel name. Script Parameter AGFREEAIR.EOTVOSCORCH |
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Input Vacc correction channel (optional) |
The Vacc (Vertical Accelaration) correction channel name. If this field is left blank, no Vacc correction is applied. Script Parameter AGFREEAIR.VACCCORCH |
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Input Tide correction channel (optional) |
The tide correction channel name. If this field is left blank, no tide correction is applied. Script Parameter AGFREEAIR.TIDECORCH |
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Input Latitude correction channel |
The latitude correction channel name. Script Parameter AGFREEAIR.LATCORCH |
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Input Free-air correction channel |
The free-air correction channel name. Script Parameter AGFREEAIR.FACORCH |
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Output Free-air anomaly channel |
The total corrected free-air anomaly channel name. The default name is "Free-air". Script Parameter AGFREEAIR.OUTCH |
Application Notes
The total correction includes the Eötvös, vertical acceleration (optional), tide (optional), latitude, and free-air corrections:
To obtain the free-air anomaly, the total correction is subtracted from measured values of absolute gravity from the L+R meter in mGal (Gabs).
See the topics below for the correction equations:
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