Geoportal better than Google Maps!

[Christophe]

The resolution of the commercial satellites is of the order of the meter (one sees the cars, but without identifying them), in some cases the resolution rises to 50cm, but to 10cm one enters already in the military field ...

Uh the resolution of this capture of Paris from Google Maps seems more accurate than 50 cm:



By zooming we get an 15 20 pixels for a car of 2m wide: so we are about 10 cm / pixel ... cheat me?

There is clearly marked "satellite" in the caption ... but maybe it is aerial photos?

[elephant]

Am I wrong where is geoportail limited to France?

For my part, I take my foot with www.bing.com/maps subtle mixture of aerial photos and satellite photos. We can almost recognize the cars of people we know.

[Christophe]

You are not mistaken for aerial photos, power lines, hydrography ... it's limited to France.

But for the IGN and Cassini (and surely full of other layers), for example, there is Belgium ...

[delnoram]

The difference between geoportal and google earth, it should not have for the photos since this is what we see on google earth



On the roads, I saw the same vehicles on the 2.
After, for updating photos, there may be a delay.

[oiseautempete]

[Uh resolving the capture of Paris Google Maps seems clearer to me that 50 cm:

The highest resolution available on Google Earth or Geoportal is 15cm (not recognizable vehicles because too few detailed) but it is very limited in the areas ...

[Christophe]

Agree for the 15 cm / pixel, it sticks with what I counted. Yes it is in the big cities that we reach this.

Ok for the same image source for the 2 tools, but it still does not say if it's aerial or satellite ...

So Geoportail as Google Maps may be a mix:
- detailed cities in HD = photo
- campaign = satellite

By the way who has ever seen clouds over one or the other? Even Belgium is "clean", not normal ...

[Forhorse]

Yes I have already seen clouds, but it is very very rare.

[oiseautempete]

all the satellite photos are snapshots of assemblies, not necessarily facts simultannément: so one can quite easily combine images cloudless ...

[Forhorse]

all the satellite photos are snapshots of assemblies, not necessarily facts simultannément: so one can quite easily combine images cloudless ...

Absolutely, and it's even sometimes blatant, especially from a distance. There are clearly areas where the photos were not taken in the same season

[Grelinette]

Hello,

I make a little UP of this subject to inform you that the Geoportal site has been updated recently and its new version seems much better than the previous one, in terms of speed of display and quality of views ... and it's French!

Geoportal: https://www.geoportail.gouv.fr/