Description
Classify supplied DOP using this tool’s illustrative thresholds and policy labels.
Geodesy distinguishes a mathematical reference ellipsoid, a realized coordinate datum and the physical gravity field. Geodetic latitude follows the ellipsoid normal; geocentric latitude follows a radius from the center. Ellipsoidal height, orthometric height and geoid undulation are separate signed quantities. Keep the declared ellipsoid, coordinate axes, angular units and time scale with a result.
Classify supplied DOP using this tool’s illustrative thresholds and policy labels.
When to use this tool
Use this tool when you need to classify supplied DOP using this tool’s illustrative thresholds and policy labels.
How to use the tool and how it works
- Enter dop using the definitions below.
- Run the operation. Resolve input-format errors before interpreting an output.
- Read result.band, result.policy, using the stated boundary, ordering, sign and absence conventions.
Classify positive DOP by inclusive upper thresholds 1,2,5,10 and 20 into ideal, excellent, good, moderate, fair and then poor. Return the illustrative policy string with the band.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| dop | Positive dimensionless dilution-of-precision factor, at most 10⁶. | Finite numeric value satisfying the stated comparisons. |
| Output field | Interpretation |
|---|---|
| result | Object containing the fields below. |
| result.band | One of ideal, excellent, good, moderate, fair or poor under this tool’s thresholds. |
| result.policy | Explicit note that DOP bands are illustrative and do not certify accuracy. |
{
"input": {
"dop": 3
},
"output": {
"result": {
"band": "good",
"policy": "illustrative historical DOP bands, not accuracy certification"
}
}
}Limitations and assumptions
- DOP must be at most 10⁶ and is dimensionless. Bands are this tool’s illustrative convention, not a formal accuracy standard; measurement noise, bias and satellite-observation quality are not inputs.
- All quantities are finite and retain the units stated for this operation. Ellipsoid-parameter tools use semi-major axis 1–10⁸ m and dimensionless flattening 0–0.02; explicit-axis tools use 0.9a≤b≤a unless a tighter bound is stated. These tools do not fetch datums, geoid grids, satellite observations or Earth-orientation updates.
- Every declared outer field is required and unknown outer fields are rejected. Strings and JSON text have size limits, lists are bounded to 128 entries, and JSON nesting/node counts are bounded. Tighter operation-specific bounds stated above take precedence.
- Numeric results must be finite. Large physical magnitudes are allowed by the output evidence checks, while integer fields and source schemas retain their exactness rules. Source indexes are zero-based. Floating-point residues can remain even where an ideal formula gives an exact zero.
Alternative or Complementary methods
Use a coordinate transform for a change of representation and explicit datum parameters for a change of reference frame. Preserve model and convergence metadata, and use observation and datum information appropriate to a real survey before interpreting a computed tolerance as accuracy.
References
Similar or alternative tools
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