EPSG systems

EPSG:32718 WGS 84 / UTM zone 18S

Projected system (Transverse Mercator) in use: World - S hemisphere - 78°W to 72°W - by country. The full definition below, and conversion in one click.

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System record
CodeEPSG:32718
NameWGS 84 / UTM zone 18S
TypeProjected system — Transverse Mercator
Area of use World - S hemisphere - 78°W to 72°W - by country
Between 78°W and 72°W, southern hemisphere between 80°S and equator, onshore and offshore. Argentina. Brazil. Chile. Colombia. Ecuador. Peru.
Bounds W -78,00° · S -80,00° · E -72,00° · N 0,00°
Also covers Argentina, Brazil, Chile, Colombia, Ecuador, Peru
DatumWorld Geodetic System 1984
Ellipsoid WGS 84 a = 6378137 m · 1/f = 298.257223563
Base geographic system EPSG:4326 — WGS 84
Unit metre (E east, N north)
Transformation to WGS 84 None: this is WGS 84
ScopeNavigation and medium accuracy spatial referencing.

Projection parameters

ParameterValueUnit
Latitude of natural origin0degree
Longitude of natural origin-75degree
Scale factor at natural origin0.9996unity
False easting500000metre
False northing10000000metre

proj4 definition

+proj=utm +zone=18 +south +datum=WGS84 +units=m +no_defs

Paste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:32718.

WKT (ESRI format, the .prj content)

PROJCS["WGS_1984_UTM_Zone_18S",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",-75.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]

All systems — Argentina

Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.