Required inputs
Latitude
Longitude
Elevation
Coordinate datum
Horizon and atmosphere policy
Ordered execution
Work the protocol
- 1
Geocode without discarding the original place evidence.
- 2
Record signed coordinates and datum.
- 3
Declare geocentric or topocentric origin.
- 4
Apply elevation only where the method consumes it.
- 5
Keep terrain and refraction limitations explicit.
Outputs
- Observer contract
- Origin declaration
- Horizon limitations
Done only when
- Coordinates round-trip exactly.
- Origin is declared.
- Observer-sensitive outputs cite this contract.
Fail closed
Refusal conditions
- A city centroid is described as the event site.
- Coordinate signs or datum are absent.
- Local obstruction is inferred from ideal geometry.