| shaded surface [message #8471] |
Fri, 14 March 1997 00:00  |
Achim Hein
Messages: 42
Registered: February 1996
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Member |
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Here is my problem:
I have got two files, one contains the surface backscattering data, the
other file contains the corresponding height information. Both files
are floating point arrays of dimension 6000 x 28000 pixel.
If I want to print these files fully resoluted - means every pixel will
be printed - I can do it by printing in *.pcl or *.ps format.
Any image compression ruins the information in the picture - so it is
forbidden to compress anyway.
But what is the way to get similar resolutions in shaded surface
interpretation?
Cheers
Achim
_______________________________________________
Dipl.-Ing. A. Hein
PB2 / ZESS - Uni-GH-Siegen
Paul-Bonatz Str. 9-11
57068 Siegen
Phone: 0271/740-3362
Fax: 0271/740-2336
Mail: Hein@nv.et-inf.uni-siegen.de
_______________________________________________
Please have a look at our Web-Sites:
http://www.nv.et-inf.uni-siegen.de/pb2/www_pb2
_______________________________________________
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| Re: shaded surface [message #8542 is a reply to message #8471] |
Tue, 18 March 1997 00:00  |
Achim Hein
Messages: 42
Registered: February 1996
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Member |
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David Fanning wrote:
>
> Achim Hein says he feels insecure about my flippant remark
> about his 6000 x 28000 *exact* representation of a shaded
> surface.
>
> Sorry, Achim, you are absolutely right. If you get this
> thing printed the way you want it it will be a "phantastical
> presentation effect" and I will be drolling over it just like
> everyone else. If you let me in on the secret I might
> write it up as a programming tip. Just be sure to tell us
> how to do it with less than 2 GBytes of RAM, because I
> don't think I'm going to have *that* kind of horsepower
> anytime soon. :-)
>
Ok, Ok, it sounds a little bit like 'enterprise' and 'warp8' but for
'online'-SAR-processing algorithms I would say 2 GByte of RAM is a usual
configuration and if you are not going to have these kind of horsepower
the only thing you need is a virtual page count of 4GByte and a lot of
time...
Regards
Achim
--
_______________________________________________
Dipl.-Ing. A. Hein
PB2 / ZESS - Uni-GH-Siegen
Paul-Bonatz Str. 9-11
57068 Siegen
Phone: 0271/740-3362
Fax: 0271/740-2336
Mail: Hein@nv.et-inf.uni-siegen.de
_______________________________________________
Please have a look at our Web-Sites:
http://www.nv.et-inf.uni-siegen.de/pb2/
_______________________________________________
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| Re: shaded surface [message #8543 is a reply to message #8471] |
Tue, 18 March 1997 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Achim Hein says he feels insecure about my flippant remark
about his 6000 x 28000 *exact* representation of a shaded
surface.
Sorry, Achim, you are absolutely right. If you get this
thing printed the way you want it it will be a "phantastical
presentation effect" and I will be drolling over it just like
everyone else. If you let me in on the secret I might
write it up as a programming tip. Just be sure to tell us
how to do it with less than 2 GBytes of RAM, because I
don't think I'm going to have *that* kind of horsepower
anytime soon. :-)
Cheers!
David
Just say, all the world's great ideas seemed phantastical
when they were first dreamed up!
-----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
2642 Bradbury Court, Fort Collins, CO 80521
Phone: 970-221-0438 Fax: 970-221-4762
E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
-----------------------------------------------------------
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| Re: shaded surface [message #8544 is a reply to message #8471] |
Tue, 18 March 1997 00:00 |
Achim Hein
Messages: 42
Registered: February 1996
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Member |
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Struan Gray wrote:
>
> Achim Hein, hein@nv.et-inf.uni-siegen.de writes:
>
>> First: this problem is a trivial one, so it seems to be that I am an
>> absolute beginner.
>
> no.
>
>> Second: this problem can not be soluted and everyone (with the exception
>> of me) knows this as fact.
>
> almost.
>
> 6000 x 28000 x floating point is a *big* array. I'd be interested to know
> how you are printing this: assuming 150dpi true colour, you are printing 1m x
> 5m fine-art posters as your 'normal' output. Admittedly this is not unheard
> of in the graphics business, but it's a specialised job and it'd be fun to
> hear how you go about it.
At the moment it is a little bit utopian to print images that largeness
because before printing this picture you have to process it and
processing means a kind of filtering in two dimensional frequency domain
- I think you know the fouriertransformation problem of such a large
array (but we get one of the new Digital alpha machines with 2 GByte, so
we can process these pictures completely)
We are processing and printing the images the way you suggest - in
pieces of 2Kx4K.
You are right if you say the plots are growing up to x meter posters but
that's the way to plot exact maps and before asking an cartograph to
plot my files I want to know how to generate them.
There is another reason to get these large shaded images. It will be a
phantastical presentation effect if you are able to show a 3 dimensional
1m x 1m plot of an interesting area. In our case we could show an 3
dimensional map made by remote sensing data simply received by flying
over the surface and not generated by pixelwise surveying.
Thanks
Achim
--
_______________________________________________
Dipl.-Ing. A. Hein
PB2 / ZESS - Uni-GH-Siegen
Paul-Bonatz Str. 9-11
57068 Siegen
Phone: 0271/740-3362
Fax: 0271/740-2336
Mail: Hein@nv.et-inf.uni-siegen.de
_______________________________________________
Please have a look at our Web-Sites:
http://www.nv.et-inf.uni-siegen.de/pb2/
_______________________________________________
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| Re: shaded surface [message #8545 is a reply to message #8471] |
Tue, 18 March 1997 00:00 |
Struan Gray
Messages: 178
Registered: December 1995
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Senior Member |
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Achim Hein, hein@nv.et-inf.uni-siegen.de writes:
> First: this problem is a trivial one, so it seems to be that I am an
> absolute beginner.
no.
> Second: this problem can not be soluted and everyone (with the exception
> of me) knows this as fact.
almost.
6000 x 28000 x floating point is a *big* array. I'd be interested to know
how you are printing this: assuming 150dpi true colour, you are printing 1m x
5m fine-art posters as your 'normal' output. Admittedly this is not unheard
of in the graphics business, but it's a specialised job and it'd be fun to
hear how you go about it.
Anyway, if you want to plot this using SHADE_SURF you will have to plot it
in pieces and then stitch the pieces back together, either automatically with
IDL or with a graphics program. Take a look at what is called a "painter's
algorithm" in graphics textbooks to get an idea of what order to plot the
pieces: essentially you plot the stuff at the back first and then if the stuff
in front overwrites it you don't have to worry.
Struan
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| Re: shaded surface [message #8546 is a reply to message #8471] |
Tue, 18 March 1997 00:00 |
Achim Hein
Messages: 42
Registered: February 1996
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Member |
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David Fanning wrote:
>
> Achim Hein <hein@nv.et-inf.uni-siegen.de> writes:
>
>> Here is my problem:
>> I have got two files, one contains the surface backscattering data, the
>> other file contains the corresponding height information. Both files
>> are floating point arrays of dimension 6000 x 28000 pixel.
>> If I want to print these files fully resoluted - means every pixel will
>> be printed - I can do it by printing in *.pcl or *.ps format.
>> Any image compression ruins the information in the picture - so it is
>> forbidden to compress anyway.
>> But what is the way to get similar resolutions in shaded surface
>> interpretation?
>
> Surely your joking, Mr. Hein! :-)
>
You make me feel insecure!
There are now two opportunities of interpreting.
First: this problem is a trivial one, so it seems to be that I am an
absolute beginner.
Second: this problem can not be soluted and everyone (with the exception
of me) knows this as fact.
How shall I put it?
Is there a way to print an 3-d-image in shaded representation and nearly
full resolution or how can I print a 6000x28000 window or should I
forget about it?
I try to plot a topography map including height data and surface
condition and in shadesurfing it in a 1000x1000 window, you can't see
nothing.
Cheers
Achim
_______________________________________________
Dipl.-Ing. A. Hein
PB2 / ZESS - Uni-GH-Siegen
Paul-Bonatz Str. 9-11
57068 Siegen
Phone: 0271/740-3362
Fax: 0271/740-2336
Mail: Hein@nv.et-inf.uni-siegen.de
_______________________________________________
Please have a look at our Web-Sites:
http://www.nv.et-inf.uni-siegen.de/pb2/www_pb2
_______________________________________________
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