EPSG systems

EPSG:25391 Luzon 1911 / Philippines zone I

Projected system (Transverse Mercator) in use: Philippines - zone I onshore. The full definition below, and conversion in one click.

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System record
Code	EPSG:25391
Name	Luzon 1911 / Philippines zone I
Type	Projected system — Transverse Mercator
Area of use	Philippines - zone I onshore Philippines - onshore west of 118°E.
Bounds	W 116,89° · S 7,75° · E 118,00° · N 9,32°
Countries	Philippines
Datum	Luzon 1911
Ellipsoid	Clarke 1866 a = 6378206.4 m · 1/f = 294.978698214
Base geographic system	EPSG:4253 — Luzon 1911
Unit	metre (X east, Y north)
Transformation to WGS 84	Luzon 1911 to WGS 84 (1) (EPSG:1161) — accuracy 17 m
Scope	Engineering survey, topographic mapping.

Projection parameters

Parameter	Value	Unit
Latitude of natural origin	0	degree
Longitude of natural origin	117	degree
Scale factor at natural origin	0.99995	unity
False easting	500000	metre
False northing	0	metre

proj4 definition

+proj=tmerc +lat_0=0 +lon_0=117 +k=0.99995 +x_0=500000 +y_0=0 +ellps=clrk66 +units=m +towgs84=-133,-77,-51 +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:25391.

WKT (ESRI format, the .prj content)

PROJCS["Philippines_Zone_I",GEOGCS["GCS_Luzon_1911",DATUM["D_Luzon_1911",SPHEROID["Clarke_1866",6378206.4,294.978698213898]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",117.0],PARAMETER["Scale_Factor",0.99995],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]

All systems — Philippines

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

Projection parameters

proj4 definition

WKT (ESRI format, the .prj content)

Other systems — Philippines