Geospatial & Survey

Straight-line distance from a horizontal separation and two elevations.

Geographic extrema, center, and spherical width/height of a point set.

Decimal degrees ↔ DMS. Enter decimal, or degrees/minutes/seconds with hemisphere 1 = N/E and −1 = S/W.

Move a geographic point by north and east offsets on a local tangent plane (R = 6,371 km).

Project a start coordinate by distance and compass azimuth on the 6,371 km sphere. Covers the field “offset a shot” case.

Δh = h2 − h1. Sign is preserved. Same vertical datum required.

Grade = rise/run, slope angle, and run:rise ratio from a horizontal distance and Δelevation.

Haversine distance on a 6,371 km sphere. Field ranging, not a cadastral baseline.

Wrap a heading to [0°, 360°) and add magnetic declination (east positive) to get true bearing.

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

Local easting/northing intersection of two compass bearings (0° = north, 90° = east). Forward rays only.

Perpendicular distance from P to line AB in local easting/northing. t < 0 is before A; t > 1 is past B.

Planar shoelace area and perimeter from ordered local easting/northing vertices.

Prism volume V = A × h. Screening earthwork, not a TIN/end-area engine.

Geometric radio line-of-sight distance from two antenna heights. Estimate only.

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

Triangle area from three measured side lengths (Heron).

WGS84 geographic ↔ UTM. Hemisphere 1 = north, −1 = south. Leave lat/lon blank to invert.