Survey Point Distance & Bearing

Horizontal haversine, initial bearing, Δelevation, 3D distance, and grade between two occupied points.

Geospatial & Survey

Horizontal haversine, initial bearing, Δelevation, 3D distance, and grade between two occupied points.

App id: GEO-09. 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

D3 = √(dh² + Δh²)

Inputs

Name	Unit
Latitude A (camera)	`deg`
Longitude A (camera)	`deg`
Elevation A	`m`
Latitude B (camera)	`deg`
Longitude B (camera)	`deg`
Elevation B	`m`

Outputs

Name	Unit
Horizontal distance (hero result)	`m`
Initial bearing	`deg`
Elevation difference	`m`
3D distance	`m`
Grade	`%`

Diagnose

Observations are context. They do not pass or fail a structure. See Diagnose.

When	Observation	Severity
`distance m > 1_000_000`	Long spherical distance	caution
`percent ≥ 100`	Steeper than 100%	caution

Assumptions

Spherical horizontal. Grade is Δh / horizontal; zero when points coincide.

Provenance

Uses GEO-02, GEO-03, and GEO-08 algorithms. Elevations must share a vertical datum.