EPSG:27493 · Portugal
Datum 73 / Modified Portuguese Grid to KML & KMZ
Datum 73 / Modified Portuguese Grid (EPSG:27493) is a Transverse Mercator coordinate system on the Datum 73 datum, with coordinates in metres. Its official area of use is: Portugal - mainland - onshore.
- Converter already set to EPSG:27493
- 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 “27493” and pick Datum 73 / Modified Portuguese Grid.
- Check one point you know on the map, then press Save KML or Save KMZ and open it in Google Earth.
Common mistakes with Datum 73 / Modified Portuguese Grid
- Feet entered as metres. Datum 73 / Modified Portuguese Grid 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. Datum 73 / Modified Portuguese Grid 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. Datum 73 / Modified Portuguese Grid is meant for Portugal - mainland - onshore. 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.