EPSG:3121 · Philippines
PRS92 / Philippines zone 1 to KML & KMZ
PRS92 / Philippines zone 1 (EPSG:3121) is a Transverse Mercator coordinate system on the PRS92 datum, with coordinates in metres. Its official area of use is: Philippines - west of 118°E onshore and offshore.
- Converter already set to EPSG:3121
- Latitude and longitude on WGS 84, as Google Earth uses
- Download the point as KML
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Good to know
- Datum: Published 7-parameter shift (typically 1–2 m).
Convert a whole spreadsheet
- Open the web app or the Windows app, and paste your rows from Excel or open a CSV file.
- Under Coordinate system, search for “3121” and pick PRS92 / Philippines zone 1.
- Check one point you know on the map, then press Save KML or Save KMZ and open it in Google Earth.
Common mistakes with PRS92 / Philippines zone 1
- Feet entered as metres. PRS92 / Philippines zone 1 is in metres. Coordinates copied from a drawing in feet must be converted first, or every point moves outwards from the grid's origin.
- Forgetting the datum. PRS92 / Philippines zone 1 is not on WGS 84: published 7-parameter shift (typically 1–2 m). Picking a WGS 84 grid with the same projection instead leaves the points off by that amount.
- Points outside the grid's area. PRS92 / Philippines zone 1 is meant for Philippines - west of 118°E onshore and offshore. Points well outside that area convert with growing error; the converter flags them so you can choose the right grid.
- A local site grid. If every point is off by the same distance and direction, the drawing may be on a local site grid. Calibrate on three or more known control points instead.
New to this? Read how to convert easting and northing to latitude and longitude.