Description
Return baseAtMeasurement-baseReference as baseDrift and subtract that drift from fieldMeasurement.
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.
Return baseAtMeasurement-baseReference as baseDrift and subtract that drift from fieldMeasurement.
When to use this tool
Use Magnetic Survey Base Station Drift Term when you need a local potential-field term with supplied coefficients or geometry.
How to use the tool and how it works
- Enter fieldMeasurement, baseAtMeasurement, baseReference. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read baseDrift, correctedField. Use the output convention below.
Return baseAtMeasurement-baseReference as baseDrift and subtract that drift from fieldMeasurement.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| fieldMeasurement | Field Measurement | Required. Finite number. |
| baseAtMeasurement | Base At Measurement | Required. Finite number. |
| baseReference | Base Reference | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| baseDrift | Base Drift | Required. Finite number. |
| correctedField | Corrected Field | Required. Finite number. |
{
"input": {
"fieldMeasurement": 50010,
"baseAtMeasurement": 50005,
"baseReference": 50000
},
"output": {
"baseDrift": 5,
"correctedField": 50005
}
}Limitations and assumptions
- All fields share units and a compatible reference; this assumes the supplied base change is applicable without modeling spatial variation, instrument bias, or actual magnetic sources.
- 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 Drift Anchor Weight
Linearly interpolate firstDrift and lastDrift and subtract the interpolated value from observed.
- Magnetic Heading Reference Offset
Add suppliedDeclinationDegrees to headingDegrees after reducing both modulo 360 and normalize correctedDegrees into [0, 360).