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[fitsbits] HEALPIX fits files



 
 
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  #1  
Old January 7th 05, 04:58 PM
Eric Greisen
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Default [fitsbits] HEALPIX fits files

AIPS cannot handle HEALPIX but can someone ?

Eric Greisen
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From: Volker Heesen
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To: AIPS
Cc:
Subject: [daip] AIPS & HEALPIX
Date: Fri, 07 Jan 2005 14:10:20 +0100

Hello,

I would like to ask: Can aips handle HEALPIX-format files? Is there a
possibility to transform HEALPIX to ordinary fits-files? Thank you!

Regards,

Volker

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  #2  
Old January 13th 05, 07:47 PM
Wayne Landsman
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Eric Greisen wrote:
AIPS cannot handle HEALPIX but can someone ?


There is FORTRAN, C and IDL code for reading HEALPIX FITS files
available by registering at http://www.eso.org/science/healpix/. There
is also a IDL image display program MAPVIEW available from the WMAP
software library (http://lambda.gsfc.nasa.gov/product/map/m_sw.cfm).
This can be run without an IDL license using the IDL virtual machine
although this is somewhat cumbersome.

Calabretta & Greisen (2002, A&A, 395, 1077) originally described HealPix
as a pixelization which defines a distribution of points on the sphere
but which does not relate these to points in a plane of projection and
which therefore is outside the scope of WCS. But I was excited to see
Mark Calabretta's recent preprint "Mapping on the HealPix Grid"
available at astro-ph/0412607 which shows that Healpix *is* associated
with a map projection, which will incorporated in V3.7 (not yet
released?) of WCSLIB. I think this should eventually allow
astronomical display programs (DS9, AIPS) to convert Healpix maps to any
desired projection.

The LAMBDA data center plans to increase its use of Healpix FITS files
for CMB data, so it would be nice if these files were readable by the
major display programs.

--Wayne Landsman

  #3  
Old January 13th 05, 10:11 PM
William Pence
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Not sure if this is any help, but a google search on 'HEALPIX FITS' returns
links to a number of software packages that can read HEALPIX FITS files.

-Bill Pence

Eric Greisen wrote:
AIPS cannot handle HEALPIX but can someone ?

Eric Greisen
------- start of forwarded message (RFC 934 encapsulation) -------
From: Volker Heesen
Sender:
To: AIPS
Cc:
Subject: [daip] AIPS & HEALPIX
Date: Fri, 07 Jan 2005 14:10:20 +0100

Hello,

I would like to ask: Can aips handle HEALPIX-format files? Is there a
possibility to transform HEALPIX to ordinary fits-files? Thank you!

Regards,

Volker



  #5  
Old January 17th 05, 09:37 AM
Andreas Wicenec
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Hi,

Mark: I just read your paper on HealPix and I think your extension is
great indeed.
I have been working on a python port of the healpix software. That's
not finished yet, but
part of it is already useable. If there is interest I am willing to
work it through and
make it public.

Andreas

On 17.01.2005, at 05:31, Mark Calabretta wrote:


On Thu 2005/01/13 13:47:05 CDT, Wayne Landsman wrote
in a message to:

with a map projection, which will incorporated in V3.7 (not yet
released?) of WCSLIB.


Should be released sometime soon.

I think this should eventually allow
astronomical display programs (DS9, AIPS) to convert Healpix maps to
any
desired projection.


HEALPix data is best displayed in the HEALPix projection itself because
no regridding is required, you see the data directly without potential
artifacts introduced by regridding. All that is required is for a
utility program to reorganize the 1-D vector (ring or nested) onto the
2-D grid. The HPX projection type can then be used to add a graticule
and this can be saved as a 2-D FITS image and viewed with any software
that understands FITS WCS (with HPX).

However, such an image is presented with an odd 45 deg rotation
(handled
in the WCS via a PCi_j or CDi_j matrix). The double-pixelisation
eliminates this but is not as yet supported by any software.

Mark Calabretta
ATNF


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  #7  
Old January 27th 05, 02:19 AM
Mark Calabretta
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On Thu 2005/01/13 13:47:05 CDT, Wayne Landsman wrote
in a message to:

Eric Greisen wrote:
AIPS cannot handle HEALPIX but can someone ?


There is FORTRAN, C and IDL code for reading HEALPIX FITS files
available by registering at
http://www.eso.org/science/healpix/. There
is also a IDL image display program MAPVIEW available from the WMAP
software library (http://lambda.gsfc.nasa.gov/product/map/m_sw.cfm).


Also, Roukema's isolat package

http://cosmo.torun.pl/GPLdownload/do...-0.1.12.tar.gz

is available (GPL) for converting between pixel number and position,
finding the pixel closest to a given position, etc.

Mark Calabretta
ATNF

 




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