Description
Linearly interpolate firstDrift and lastDrift and subtract the interpolated value from observed.
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.
Linearly interpolate firstDrift and lastDrift and subtract the interpolated value from observed.
When to use this tool
Use Gravity Drift Anchor Weight when you need a local potential-field term with supplied coefficients or geometry.
How to use the tool and how it works
- Enter time, firstTime, lastTime, firstDrift, lastDrift, observed. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read anchorWeight, interpolatedDrift, corrected. Use the output convention below.
Require increasing anchor times and time within them. Linearly interpolate firstDrift and lastDrift and subtract the interpolated value from observed.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| time | Time | Required. Finite number. |
| firstTime | First Time | Required. Finite number. |
| lastTime | Last Time | Required. Finite number. |
| firstDrift | First Drift | Required. Finite number. |
| lastDrift | Last Drift | Required. Finite number. |
| observed | Observed | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| anchorWeight | Anchor Weight | Required. Finite number. |
| interpolatedDrift | Interpolated Drift | Required. Finite number. |
| corrected | Corrected | Required. Finite number. |
{
"input": {
"time": 5,
"firstTime": 0,
"lastTime": 10,
"firstDrift": 2,
"lastDrift": 4,
"observed": 20
},
"output": {
"anchorWeight": 0.5,
"interpolatedDrift": 3,
"corrected": 17
}
}Limitations and assumptions
- Times share units and origin and drift shares observation units; no extrapolation, physical drift model, anchor quality, or actual instrument calibration is established.
- 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 Datum Offset Contribution
Multiply suppliedDatumOffset by that scale, reverse sign when subtractOffset, and add the signed correction to observedGravity.
- Gravity Freeair Height Correction Factor
Multiply heightMeters by gradientMgalPerMeter and add that correction to observedMgal.