| Re: IDL structure to HDF-5 [message #56649] |
Thu, 08 November 2007 07:20 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Loren Anderson writes:
> You centainly could put all this data in to a FITS binary table using
> the routines in Wayne's library: http://idlastro.gsfc.nasa.gov/. The
> process is relatively straghtforward. If you are working with
> astronomers (I'm guessing here), we do like our FITS files, and have a
> number of astronomy-specific tools for viewing them already.
I'm becoming a big fan of the NASA IDL routines. Every time
I use one, I'm impressed all over again with the quality of
the code.
Have you ever gotten a T-shirt, Wayne, for all your effort?
I was called a couple of months ago about my "size,"
but I'm still waiting. The good folks in Boulder are
probably holding on to it until they see what I write
about the new IDL Eclipse development environment. :-)
Cheers,
David
P.S. I'm looking forward to the big "preview" of
the IDLDE next week in Boulder. Should be exciting.
I can't wait to hear what other people think about
it. :-)
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: IDL structure to HDF-5 [message #56650 is a reply to message #56649] |
Thu, 08 November 2007 06:36  |
Loren Anderson
Messages: 22
Registered: August 2007
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Junior Member |
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> Here is my situation. I process an image, which results
> in 24-separate spectra. Each spectra needs to be fit with
> three separate Gaussians. (I'm waving my hands a bit here,
> because I haven't figured out how to do this part yet.) I need
> to save the original image, the processed image, the spectra,
> and the fitting parameters and other equations.
>
> Would you recommend FITS or HDF for such a project?
Until someone more qualified than me answers this, here is a link to
the FITS standards: http://fits.gsfc.nasa.gov/.
You centainly could put all this data in to a FITS binary table using
the routines in Wayne's library: http://idlastro.gsfc.nasa.gov/. The
process is relatively straghtforward. If you are working with
astronomers (I'm guessing here), we do like our FITS files, and have a
number of astronomy-specific tools for viewing them already.
Back to the OP's question, can't you just use writefits? I work with
FITS cubes almost exclusively, and that's what I use for such mapped
spectra. writefits adjusts the header appropriately for 3D data.
-Loren
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| Re: IDL structure to HDF-5 [message #56657 is a reply to message #56650] |
Wed, 07 November 2007 13:37 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Wayne Landsman writes:
> Interestingly, I have been just looking for something similar for
> HDF-5 files. You can read an HDF5 file into an IDL structure using
> a single call to H5_PARSE. But what I haven't found anywhere is
> the capablity to write that same structure back to an HDF-5 file
> without considerable programming. --Wayne
Humm. Interesting, indeed. My client wants a fair amount
of information packed into the FITS file, as that is
what they are used to. I've been trying to sell HDF as
an alternative, since I am more certain about how
to get the data out of there. (Simply more experience
with it than with FITS.)
Here is my situation. I process an image, which results
in 24-separate spectra. Each spectra needs to be fit with
three separate Gaussians. (I'm waving my hands a bit here,
because I haven't figured out how to do this part yet.) I need
to save the original image, the processed image, the spectra,
and the fitting parameters and other equations.
Would you recommend FITS or HDF for such a project?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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