On Mar 31, 7:59 pm, Perry Greenfield <pe...@stsci.edu> wrote:
On Mar 30, 2008, at 12:38 PM, Keflavich wrote:
I was thinking no resampling, just put an RA/DEC grid and fit the image into it as well as it can be. I don't know if it's possible to display rotated pixels, but that would be the most useful behavior in this case.
Just to clarify, do you mean nearest neighbor regridding? It does sound like you mean that you would like to see the image rotated to have north up. Right?
That's correct.
I'm not sure I understand how the transforms would make it easier to display sky coordinates without labeling axes, though. Are you saying that if the image is already sampled in RA/DEC (or whatever coordinate system) space, then it should be easy to display the RA/DEC coordinates on the axes?
The transforms machinery would allow displaying the image in its original orientation and then when the cursor was moved over the image, the displayed x, y coordinates could display RA, DEC instead of pixel coordinates. But if you desire to rotate the image and have it aligned with north, that capability isn't really important. Doing the rotated image needs some tool to do the rotation (quickly presumably rather than a precise mapping) and then display that as part of a larger tool. That would be much more straightforward. But we haven't made such a tool yet. If someone does it first, it sure would be nice to add, at least as part of an astronomy toolkit.
OK, I didn't realize that the transforms work as you describe, I'll have to test that. If I can get something like the tool you described running, I'll post my results here, but I'm going to may slow progress if any. I'm not clear how I would go about making usable paper figures in Python without this capability, though, so what does everyone else do? Just use other tools for figure generation? Re: Nicolas and Tom Is the astropy mailing list active? I've attempted to subscribe but haven't received confirmation or any list e-mails. Otherwise, perhaps just listing things on the wiki is enough, or keeping a list via this group? Adam