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Just show the explanation of the PEGE symbol.
For this animation, I rendered Earth
by clearmap.tga as described in POV 1994.
This was fine at the resolution of this days,
but now, I would like a file like
clearmap.tga with a much higher resoltuion.
What source?
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Le 03/11/2011 21:58, Roland Mösl nous fit lire :
> Just show the explanation of the PEGE symbol.
>
> For this animation, I rendered Earth
> by clearmap.tga as described in POV 1994.
>
> This was fine at the resolution of this days,
> but now, I would like a file like
> clearmap.tga with a much higher resoltuion.
>
> What source?
>
> Roland Mösl
For daylight with snow,
http://www.nnvl.noaa.gov/ddsimages/SnowIceCover_Daily.png
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)
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On 2011-11-03 23:04, Le_Forgeron wrote:
> Le 03/11/2011 21:58, Roland Mösl nous fit lire :
>> Just show the explanation of the PEGE symbol.
>>
>> For this animation, I rendered Earth
>> by clearmap.tga as described in POV 1994.
>>
>> This was fine at the resolution of this days,
>> but now, I would like a file like
>> clearmap.tga with a much higher resoltuion.
>>
>> What source?
>>
>> Roland Mösl
>
> For daylight with snow,
> http://www.nnvl.noaa.gov/ddsimages/SnowIceCover_Daily.png
This picture would be optimal for spring or autumn
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!
Roland Mösl
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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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Roland Mösl wrote:
> This in PNG and the resolution of the snow picture!
It appears to be available as 21600 x 10800 TIFF (173.5MB)
http://visibleearth.nasa.gov/view_rec.php?id=2433
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Christian Froeschlin wrote:
> Roland Mösl wrote:
>
>> This in PNG and the resolution of the snow picture!
>
> It appears to be available as 21600 x 10800 TIFF (173.5MB)
>
> http://visibleearth.nasa.gov/view_rec.php?id=2433
Actually, if you feel slightly insane, click on
"Details and more Imagery" to find a 43200 x 21600
version (split up in east and west image) ;)
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Christian Froeschlin <chr### [at] chrfr de> wrote:
> Christian Froeschlin wrote:
> > It appears to be available as 21600 x 10800 TIFF (173.5MB)
You may have trouble using that directly with POV-Ray because according
to my calculations it would consume about 3.4 gigabytes of RAM. (In a
64-bit system with significantly more RAM than that it might work ok.)
> Actually, if you feel slightly insane, click on
> "Details and more Imagery" to find a 43200 x 21600
> version (split up in east and west image) ;)
That will most definitely be unusable as-is in most system, as it consumes
something like 14 gigabytes of RAM (hence you can only use it in a 64-bit
system if you have more RAM than that.)
--
- Warp
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On 2011-11-05 00:32, Christian Froeschlin wrote:
> Roland Mösl wrote:
>
>> This in PNG and the resolution of the snow picture!
>
> It appears to be available as 21600 x 10800 TIFF (173.5MB)
>
> http://visibleearth.nasa.gov/view_rec.php?id=2433
Thanks! Just downloaded the 8192 x 4096 version
--
Roland Mösl
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Warp wrote:
> You may have trouble using that directly with POV-Ray because according
> to my calculations it would consume about 3.4 gigabytes of RAM.
If it's 3 channel 8 bit I'd have expected something closer to 700 MB.
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Am 06.11.2011 00:03, schrieb Christian Froeschlin:
> Warp wrote:
>
>> You may have trouble using that directly with POV-Ray because according
>> to my calculations it would consume about 3.4 gigabytes of RAM.
>
> If it's 3 channel 8 bit I'd have expected something closer to 700 MB.
Indeed. For input images, POV-Ray has various internal storage formats
at its disposal to keep the memory footprint low, allowing it to choose
either 1, 3 or 4 channel(s) for greyscale, RGB or RGBA respectively, and
either 8 bit integer, 16 bit integer or 32 bit float precision per
channel. In addition there's also a 1 bit per pixel representation
available for black & white bitmaps.
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