High!

Christoph Hormann schrieb:


> Your posting here does not only describe something extremely ambitious, 
> it also quite strongly indicates you did not truely realize how 
> ambitious if meant seriously.  This is emphasized by the lot of 
> inaccuracies that jump into the eye when reading the text like:
> 
> - confusing of 'resolution' with 'accuracy'.
> - the SRTM did not produce any optical data so there is no necessity for 
> color processing, the link you posted is to an image generated from 
> landsat imagery.

No, the latter I did not assume - I'm quite aware that SRTM is only 
altimetry data! Obviously you misunderstood me... the statement about 
color processing was related to the Landsat sets!

> Those things might not seem important to you but when planning a project 
> like this i think it would first of all be important to have an idea 
> about the basic facts like what data sources actually exist.

Yes, I had not yet dived into the layer documentations of the Landsat 
images... perhaps they give some hints on actual ground cover and, thus, 
   an idea how the "basic pigment" of a certain landscape might look like...

> You should realize though that detailed large scale earth surface 
> rendering (meaning high resolution data with less than 100m grid spacing 
> over larger areas) is one of the toughest tasks concerning data 
> handling.  Working with ascii data file formats and mesh files will not 
> lead you anywhere.  

Yes, I can imagine that... any bundle of ASCII-data which consists of 
more than a few SRTM tiles would simply be too large to handle - unless 
I content myself exclusively with low-altitude flights or even 
"pedestrian views" where the horizon is not that far...

For a render like on
> 
>
http://news.povray.org/povray.binaries.images/thread/%3Ccllr5b%24v86%241%40chho.imagico.de%3E/

> 
> 
> to be suited for high resolution printing (the one that is posted there 
> was not yet sufficient in this respect) you have to process several GB 
> of (binary) data for example.  (the bicubic interpolation patch 
> mentioned in this posting is meanwhile available in MegaPOV BTW)

What is "bicubic interpolation"? Does it relate to image texture files 
or to altimetry data?

> This is not meant to discourage anyone to do earth renders - on the 
> contrary i have seen very nice examples of small scale renders like for 
> example
> 
> http://news.povray.org/povray.binaries.images/thread/<421a4678%40news.povray.org>/ 

Cute... but the things Thomas and I would like to go for would be far 
more realistic...

> and it would be great to see more of such. People working on such 
> concrete earth rendering project can be sure to get suggestions and tips 
> from me if i have them.

What do you think about the whole (yet still embryonic, I admit) concect 
  of PoVEarth?

See you in Khyberspace!

Yadgar

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