EPSG systems

EPSG:24878 PSAD56 / UTM zone 18S

Projected system (Transverse Mercator) in use: South America - 78°W to 72°W, S hemisphere and PSAD56 by country. The full definition below, and conversion in one click.

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System record
CodeEPSG:24878
NamePSAD56 / UTM zone 18S
TypeProjected system — Transverse Mercator
Area of use South America - 78°W to 72°W, S hemisphere and PSAD56 by country
South America (Chile - north of 45°S; Ecuador; Peru) between 78°W and 72°W, southern hemisphere, onshore.
Bounds W -78,00° · S -43,50° · E -71,99° · N 0,00°
Countries Chile, Ecuador, Peru
DatumProvisional South American Datum 1956
Ellipsoid International 1924 a = 6378388 m · 1/f = 297
Base geographic system EPSG:4248 — PSAD56
Unit metre (E east, N north)
Transformation to WGS 84 PSAD56 to WGS 84 (1) (EPSG:1201) — accuracy 42 m
ScopeEngineering survey, topographic mapping.

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 +ellps=intl +units=m +towgs84=-288,175,-376 +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:24878.

WKT (ESRI format, the .prj content)

PROJCS["PSAD_1956_UTM_Zone_18S",GEOGCS["GCS_Provisional_S_American_1956",DATUM["D_Provisional_S_American_1956",SPHEROID["International_1924",6378388.0,297.0]],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 — Chile

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