Re: [Maposmatic-dev] Implementing bbox limitation

[Thomas Petazzoni]

Le Tue, 8 Sep 2009 11:10:53 +0200,
David MENTRE <address@hidden> a écrit :

> 2009/9/8 Maxime Petazzoni <address@hidden>:
> > We're going to have the same old degree-to-distance problem here. 1
> > or 2 degrees might be good at our latitudes, but the poor guy in
> > Iceland or Greenland won't be able to map his garden with that, and
> > the guys from Equator will be able to get huge maps.
> 
> Why? The surface on the sphere is the same, whatever latitude you are
> looking at.

Hum, sorry, but I don't think you're correct.

On the latitude side, yes, wherever you are on earth, 1° of latitude
will always be the same distance. However, the distance of 1° of
longitude depends on the latitude.

At the equator, 1° of longitude is a long distance, while near the
poles, it's a much shorter distance.

Thomas
-- 
Thomas Petazzoni                         http://thomas.enix.org
Promouvoir et défendre le Logiciel Libre http://www.april.org
Logiciels Libres à Toulouse              http://www.toulibre.org

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