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Coordinates for Land Surveyors

Surveyors use UTM and State Plane for precision measurements, and DMS for legal land descriptions.

Surveying demands the highest precision in coordinate work. Surveyors routinely work with UTM, State Plane Coordinate System (SPCS), and geographic coordinates (lat/long in DMS). Understanding all of these — and when to use each — is fundamental to professional survey practice.

UTM for Surveying

UTM is popular in surveying because it expresses positions in meters on a flat Cartesian grid. This makes distance calculations straightforward: the distance between two UTM points is simply √((ΔE)² + (ΔN)²) in meters — no spherical geometry needed for small areas.

State Plane Coordinate System (SPCS)

SPCS divides the US into 125 zones, using either Lambert Conformal Conic or Transverse Mercator projections. It provides even less distortion than UTM for local work. Survey-grade GPS receivers can output SPCS directly. Legal land descriptions in the US frequently reference SPCS coordinates.

DMS in Legal Descriptions

Metes-and-bounds legal descriptions use DMS for monument coordinates. A legal description might read: "Beginning at a point having coordinates 47°36'22\"N, 122°19'55\"W, thence bearing N 45°00'00\" E, a distance of 100 feet..." Converting between DMS and DD is a daily task for surveyors.

GPS Equipment Formats

Trimble, Leica, and Topcon GPS receivers can display in DD, DMS, DDM, UTM, or SPCS. The datum (WGS84 vs. NAD83) matters for high-precision work — they differ by up to ~1 meter in North America. This converter uses WGS84.

Coordinate Converter

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