Why are EPSG:5179 values so much larger than EPSG:5186 values?

The false easting and northing are 1,000,000 m and 2,000,000 m instead of 200,000 m and 600,000 m, and the central meridian is 127.5° E instead of 127° E.

Can I convert EPSG:5179 data to EPSG:5186?

Yes. Open the EPSG:5186 page, which presets that target, then add the file with its .prj and download SHP or CSV.

Can I keep EPSG:5179 in GeoJSON or KML?

No. GeoJSON and KML are written in WGS 84 longitude and latitude. Choose SHP or CSV to keep EPSG:5179 coordinates.

EPSG:5179 Coordinate Converter

Convert EPSG:5179 Korea Unified CS coordinates in metres to WGS 84, or export SHP and CSV in EPSG:5179. One zone with a 0.9996 scale factor covers the area.

KGD2002 / Unified CS

Area of use (longitude / latitude): west 122.71°, south 28.6°, east 134.28°, north 40.27°.

PROJ definition

+proj=tmerc +lat_0=38 +lon_0=127.5 +k=0.9996 +x_0=1000000 +y_0=2000000 +ellps=GRS80 +units=m +no_defs

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One zone for the whole area

EPSG:5179, KGD2002 / Unified CS, is a Transverse Mercator projection in metres on the GRS80 ellipsoid. Unlike the belt systems, a single zone covers the whole area of use, which the bundled definition sets at 122.71° to 134.28° E and 28.6° to 40.27° N. The central meridian is 127.5° E, the latitude of origin is 38° N, the scale factor is 0.9996, the false easting is 1,000,000 m and the false northing is 2,000,000 m.

Recognizing EPSG:5179 values

The large false values make the numbers easy to spot: x is around one million and y around two million. The point at 127° E, 37.5° N is about x = 955,805 m and y = 1,944,644 m in EPSG:5179, while the same point is about x = 200,000 m and y = 544,504 m in EPSG:5186.

How mapverter handles EPSG:5179

A .prj is matched by its EPSG code or by its projection parameters, including the ESRI-style name KGD2002_Unified_Coordinate_System.
Without a .prj, the Korean interface checks EPSG:5179 second, right after EPSG:5186, and offers it when the data fits its area of use.
This page presets EPSG:5179 as the target for SHP and CSV output. KML, KMZ, GeoJSON and GPX always use WGS 84.

Frequently asked questions

Why are EPSG:5179 values so much larger than EPSG:5186 values?: The false easting and northing are 1,000,000 m and 2,000,000 m instead of 200,000 m and 600,000 m, and the central meridian is 127.5° E instead of 127° E.
Can I convert EPSG:5179 data to EPSG:5186?: Yes. Open the EPSG:5186 page, which presets that target, then add the file with its .prj and download SHP or CSV.
Can I keep EPSG:5179 in GeoJSON or KML?: No. GeoJSON and KML are written in WGS 84 longitude and latitude. Choose SHP or CSV to keep EPSG:5179 coordinates.