Question 1

What coordinate formats does this tool support?

Accepted Answer

The converter accepts three common formats: Decimal Degrees (DD) such as '40.748817, -73.985428', Degrees Minutes Seconds (DMS) such as "40°44'55.74\" N, 73°59'7.54\" W", and UTM (Universal Transverse Mercator) such as '18T 583960 4507523'. Paste any of these and the tool auto-detects the format.

Question 2

What is the difference between DD and DMS coordinates?

Accepted Answer

Decimal Degrees (DD) express latitude and longitude as plain decimal numbers, e.g. 40.748817, -73.985428. Degrees Minutes Seconds (DMS) break the same value into integer degrees, integer minutes, and decimal seconds plus a cardinal direction. DD is preferred in software and APIs; DMS is traditional in maps and surveying.

Question 3

What is UTM and when should I use it?

Accepted Answer

UTM (Universal Transverse Mercator) divides the Earth into 60 vertical zones of 6 degrees longitude each. Coordinates are expressed as a zone number, a band letter, an easting, and a northing in metres. UTM is popular in GIS, military mapping, and field surveying because distances in metres are easy to work with.

Question 4

How accurate is the UTM conversion?

Accepted Answer

The conversion uses the standard USGS Bulletin 1532 closed-form formulas on the WGS84 ellipsoid (the same datum used by GPS). For points well within a UTM zone the round-trip error is sub-millimetre. Accuracy degrades slightly near zone boundaries and at high latitudes above 80 degrees, where UTM is not designed to be used.

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Coordinates Converter

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