Initial Bearing

Forward azimuth from point 1 to point 2. 0° = north, 90° = east, wrapped to [0°, 360°).

Geospatial & Survey

Forward azimuth from point 1 to point 2. 0° = north, 90° = east, wrapped to [0°, 360°).

App id: GEO-03. Reference version 1.0.

How to fill it

Fill the inputs. The tool shows the outputs.

On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.

Formula

θ = atan2(sinΔλ cosφ2, cosφ1 sinφ2 − sinφ1 cosφ2 cosΔλ)

Inputs

Name	Unit
Latitude 1 (camera)	`deg`
Longitude 1 (camera)	`deg`
Latitude 2 (camera)	`deg`
Longitude 2 (camera)	`deg`

Outputs

Name	Unit
Initial bearing (hero result)	`deg`

Diagnose

This tool does not attach diagnose observations.

Assumptions

Same sphere as GEO-02. Coincident points return 0°.

Provenance

Spherical forward azimuth. Meridian convergence is not applied.