Description
Multiply heightMeters by gradientMgalPerMeter and add that correction to observedMgal.
Potential-field calculations describe local gravity or magnetic adjustments and spectral operations. Sign, vertical direction, and wavenumber convention affect the result; a single factor does not produce a complete corrected survey.
Multiply heightMeters by gradientMgalPerMeter and add that correction to observedMgal.
When to use this tool
Use Gravity Freeair Height Correction Factor when you need a local potential-field term with supplied coefficients or geometry.
How to use the tool and how it works
- Enter heightMeters, gradientMgalPerMeter, observedMgal. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read correctionMgal, correctedMgal. Use the output convention below.
Multiply heightMeters by gradientMgalPerMeter and add that correction to observedMgal.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| heightMeters | Height Meters Unit: m. | Required. Finite number. |
| gradientMgalPerMeter | Gradient Mgal Per Meter | Required. Finite number. |
| observedMgal | Observed Mgal | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| correctionMgal | Correction Mgal | Required. Finite number. |
| correctedMgal | Corrected Mgal | Required. Finite number. |
{
"input": {
"heightMeters": 100,
"gradientMgalPerMeter": 0.3086,
"observedMgal": 980000
},
"output": {
"correctionMgal": 30.86,
"correctedMgal": 980030.86
}
}Limitations and assumptions
- Gradient direction and value are supplied, in mGal/m; this does not choose a free-air coefficient, validate the height datum, or calculate a complete Bouguer or terrain-corrected anomaly.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Process the complete survey using the intended reference model and correction chain. Check spectral conventions, boundary handling, and input units rather than combining isolated terms without their model context.
References
Similar or alternative tools
- Gravity Tidal Supplied Correction Term
Subtract tideSignal from observedGravity for tideRemoved and add signed driftCorrection for corrected.
- Gravity Datum Offset Contribution
Multiply suppliedDatumOffset by that scale, reverse sign when subtractOffset, and add the signed correction to observedGravity.