EPSG systems

EPSG:23851 ID74 / UTM zone 51N

Projected system (Transverse Mercator) in use: Indonesia - 120°E to 126°E, N hemisphere onshore. The full definition below, and conversion in one click.

System record
CodeEPSG:23851
NameID74 / UTM zone 51N
TypeProjected system — Transverse Mercator
Area of use Indonesia - 120°E to 126°E, N hemisphere onshore
Indonesia - onshore north of equator and between 120°E and 126°E.
Bounds W 120,00° · S 0,00° · E 125,71° · N 3,84°
Countries Indonesia
DatumIndonesian Datum 1974
Ellipsoid Indonesian National Spheroid a = 6378160 m · 1/f = 298.247
Base geographic system EPSG:4238 — ID74
Unit metre (E east, N north)
Transformation to WGS 84 ID74 to WGS 84 (3) (EPSG:1833) — accuracy 3 m
ScopeEngineering survey, topographic mapping.

Projection parameters

ParameterValueUnit
Latitude of natural origin0degree
Longitude of natural origin123degree
Scale factor at natural origin0.9996unity
False easting500000metre
False northing0metre

proj4 definition

+proj=utm +zone=51 +a=6378160 +rf=298.247 +units=m +towgs84=-1.977,-13.06,-9.993,0.364,0.254,0.689,-1.037 +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:23851.

WKT (ESRI format, the .prj content)

PROJCS["Indonesian_1974_UTM_Zone_51N",GEOGCS["GCS_Indonesian_1974",DATUM["D_Indonesian_1974",SPHEROID["Indonesian",6378160.0,298.247]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",123.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]

All systems — Indonesia

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