Description
Look up the UTM central-meridian scale factor 0.9996 using the exact projection identifier.
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.
Look up the UTM central-meridian scale factor 0.9996 using the exact projection identifier.
UTM specializes transverse Mercator with a zone-dependent central meridian and central scale 0.9996. A central-meridian constant alone does not describe distortion at an arbitrary point.1
When to use this tool
Use this tool when you need to look up the UTM central-meridian scale factor 0.9996 using the exact projection identifier.
How to use the tool and how it works
- Enter projection using the definitions below.
- Run the operation. Resolve input-format errors before interpreting an output.
- Read result.centralMeridianScale, result.projection, using the stated boundary, ordering, sign and absence conventions.
Require the exact projection string UTM and return its central-meridian scale factor 0.9996.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| projection | Exact supported projection identifier: UTM. | Text, at most 8,192 UTF-16 code units; narrower grammar/range rules also apply. |
| Output field | Interpretation |
|---|---|
| result | Object containing the fields below. |
| result.centralMeridianScale | Dimensionless UTM central-meridian scale 0.9996. |
| result.projection | Echoed exact projection identifier UTM. |
{
"input": {
"projection": "UTM"
},
"output": {
"result": {
"centralMeridianScale": 0.9996,
"projection": "UTM"
}
}
}Limitations and assumptions
- This is a dimensionless central-meridian constant, not the point scale everywhere in a zone. No zone, hemisphere, easting or northing is inferred.
- 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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