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ESRI:102161 · Portugal

Datum 73 Hayford Gauss IPCC to KML & KMZ

Datum 73 Hayford Gauss IPCC (ESRI:102161) is a Transverse Mercator coordinate system on the Datum 73 Hayford Gauss IPCC datum, with coordinates in metres. Its official area of use is: Portugal.

  • Converter already set to ESRI:102161
  • Latitude and longitude on WGS 84, as Google Earth uses
  • Download the point as KML
Convert a spreadsheet Windows app
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Good to know

  • Datum: Treated as WGS 84, no shift (the datums agree to about a metre or better).

Convert a whole spreadsheet

  1. Open the web app or the Windows app, and paste your rows from Excel or open a CSV file.
  2. Under Coordinate system, search for “102161” and pick Datum 73 Hayford Gauss IPCC.
  3. 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 Hayford Gauss IPCC

  • Feet entered as metres. Datum 73 Hayford Gauss IPCC 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 Hayford Gauss IPCC is not on WGS 84: treated as WGS 84, no shift (the datums agree to about a metre or better). 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 Hayford Gauss IPCC is meant for Portugal. 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.