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Using Google Earth to figure out the coordinate reference system from only lon, lat information

Geographic Information Systems Asked by Nicolas Falconi on October 5, 2020

Lately, I’ve been trying to use lat/long information to plot on QGIS without any good results because I lack the correct EPSG code for the coordinate reference system. This is not the case with Google Earth, which always plots in the correct places using lat/long information.

I concluded that Google has an automatic way to discern them an select the correct coordinate reference system, and other posts have also suggested it. Is there a way to know which one are they using for my data?

45.801417207831314,9.092656559575259
45.801417207831314,9.092656559575259
45.801417207831314,9.092656559575259
45.801417207831314,9.092656559575259
45.801421972667725,9.092675509431874
45.80142711235822,9.092700934521718
45.8014346957649,9.09272071353453
45.80144571424553,9.092746763378287

Note: my data is from Como, Italy.

One Answer

Google Earth uses EPSG:4326 (WGS84). If you put coordinates into Google Earth and they look correct, then they are probably EPSG:4326.

And as one comment mentioned, do check your lat,lon vs lon,lat order. In Google Earth a KML with a Point will use lon,lat (eg: 3.028,54.825 for a point in the North Sea) in the KML itself, but the search bar in Google Earth expects the reverse and more common order of lat,lon (eg: (eg: 54.825,3.028). Most other software will also use lat,lon.

Answered by Christiaan Adams on October 5, 2020

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