Coordinate Format Converter (multi) implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t6-070

Effect

Computation or source lookup only

Input and validation requirements

The specification leaves zone-boundary ownership, UTM pole rejection, MGRS precision, and directional sign conventions unspecified. A converter that silently accepts the pole or interprets unsigned longitude differently can produce undefined or materially different outputs.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "format": "decimal",
    "latitude_deg": 40,
    "longitude_deg": -105
  },
  "expected_outputs": {
    "decimal": {
      "latitude_deg": 40,
      "longitude_deg": -105
    },
    "dms": "40°00'00.000\\\"N, 105°00'00.000\\\"W",
    "utm": {
      "zone": 13,
      "hemisphere": "N",
      "easting_m": 500000,
      "northing_m": 4427757.219
    },
    "mgrs": "13T EE 00000 27757"
  },
  "working": "DMS: 40 + 0/60 + 0/3600 = 40°N; -(105 + 0/60 + 0/3600) = -105°E. UTM zone = floor((-105 + 180)/6) + 1 = floor(12.5) + 1 = 13. Zone 13 central meridian = 6(13) - 183 = -105°. Therefore longitude difference is 0°, so the transverse-Mercator easting is the false easting 500000.000 m. Applying the WGS84 meridional-arc equation at latitude 40° gives northing 4427757.219 m. The 100 km easting square is E (500000 m), and the 4,400,000 m northing row in odd zone 13 is E; the 27,757 m remainder gives 27757. Hence MGRS = 13T EE 00000 27757."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche6/tranche6-results.json