[AstroPy] [SciPy-user] FITS images with header-supplied axes?
Russell E Owen
rowen at u.washington.edu
Tue Apr 1 16:32:42 EDT 2008
At 1:51 PM -0400 2008-04-01, Bridgman, William T. wrote:
>I agree there is some lack of coordination on some of these
>projects. Such is the nature of Open Source.
>I think there is also an issue where some of the projects are
>overkill for what individuals might need for production-pipeline/
>research/educational uses. Hence many of us start from scratch to
>keep the work compact. It's only later that we discover others
>working in similar directions.
>I obtained a copy of pywcs many months ago, trying to get
>heliographic coordinate systems installed. Other priorities
>intervened and by the time I got back to it, migration to numpy and
>changes in pyFITS seemed to break the previous version. I didn't get
>a chance to make any revisions operational.
>Would there be any interest in members of the list publishing a short
>description of what types of modules they are designing in their own
>work? It might be worthwhile for coordination & possible
>collaborations. My requirements for work projects are quite
>different from my recreational & educational python projects.
I'm part of the team working on data processing for the LSST. This
number crunching is done in C++ and the high level operations are
done in python. This work will probably be primarily of interest to
those processing a lot of data because it is pipeline-oriented.
The final product will include:
- basic types for images, masks and masked images
- image linearization (bias subtraction, flat fielding, etc.)
- wcs determination
- source detection
- image subtraction
We intend it to be usable on a variety of data sources (not just
LSST) since that's the only way to test it. Nonetheless it will
probably take a bit of work to massage the data headers.
As far as wcs goes: right now we use wcslib and have a limited python
interface on it. I suspect if anything better came along we'd be
happy to switch. (at least at the C++ level; I'm not sure about the
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