UTM and Lat-Lon Conversion
Krueger / USGS deterministic forward and inverse formulas (WGS84).
Example
You enter
- Direction latlon_to_utm
- Latitude (deg) 40
- Longitude (deg) -105
You get
- Zone 13
- Hemisphere N
- Easting 500000
- Northing 4427757
Checked against published worked examples from: USGS / NGA WGS84 UTM forward (project bundled spheroid params).
Details, formula, and sources
Formula or tableKrueger forward and inverse formulas for WGS84 ellipsoid; series expansion to 4th order. Round-trip error < 0.1 m at typical latitudes.
Source and editionUSGS Krueger series by name; J.P. Snyder, USGS PP 1395 (Map Projections - A Working Manual, 1987) by name.
Free accessUSGS PP 1395 free at pubs.usgs.gov.
What governsGeometry is not forecasting. Avalanche advisory and incident commander govern.
API field namesdirection, lat_deg, lon_deg, zone, hemisphere, easting, northing
- Datum WGS84 (NAD83 differs by ≤ 1.5 m in CONUS)USGS PP 1395