Le 04/11/2011 07:04, Roland Mösl nous fit lire :
> On 2011-11-03 23:04, Le_Forgeron wrote:
>> For daylight with snow,
>> http://www.nnvl.noaa.gov/ddsimages/SnowIceCover_Daily.png
> 
> This picture would be optimal for spring or autumn

You need to learn patience... and sample it everyday of the coming year!
(or over five years ?)

> 
> With all the snow, I would have to change the direction
> of the earth axis to the winter postion.
> 
>> For nightlight, "earthlights dmsp" in wikipedia
>> (16,384 × 8,192 pixels at full resolution)
>> http://en.wikipedia.org/wiki/File:Earthlights_dmsp.jpg
>>
>> For daylight,
>> http://commons.wikimedia.org/wiki/File:Land_shallow_topo_2048.jpg
>> (2048x1024 at full resolution)
> 
> This in PNG and the resolution of the snow picture!

Ratio 2:1 is usual for spherical projection.
Firefox report it as jpeg, and save it as such.

At least there is no clouds on it.

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