Resolution of Google Maps / Google Earth - Paul Courbis


   

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Resolution of Google Maps / Google Earth

Thursday 6 July 2006, by Paul Courbis

Following the announcements of the fantastical and fabulous Geoportal resolution of 50 cm / pixel, I asked myself the question "and Google?". Here’s the answer ...

{{}} Methodology I downloaded via Google Maps images of the Eiffel Tower at its highest resolution.

After assembly (ImageMagick wget and thank you), it gave this:


(Clicking on the picture, you get the full version: watch more than 6 MB!)

Then, making a 45 ° rotation around:


(Clicking on the picture, you get the full version: watch more than 12 MB!)

Then, remembering that the Eiffel Tower is 125 m square , one can see:


(Clicking on the picture, you get the full version: watch over 4 MB!)

Said side is 2527 pixels on the image side of Google, it gives a "pixel Google" to 5 inches!

Compared to the "fabulous" 50 cm Geoportal and knowing that the image was taken by a satellite (as IGN has done from an airplane), it’s been dreaming ...

It must be recognized that this is only valid for certain areas (Paris and suburbs, cities ...) while resolutiion Geoportal is homogeneous throughout France.

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