[AstroPy] fits table column values
jslavin at cfa.harvard.edu
Mon Dec 23 11:16:24 EST 2013
Maybe I'm being dense today, but I'm not clear on how to do something
pretty basic. The issue is that I have essentially 3-D data wherein the
data is not known on a uniform grid. That is, although the data is on an
x-y grid, neither the x values nor the y values are uniform. I want to
save the values (i.e. z values) at each point in the grid in a fits file.
The natural thing to do is either create an image or a table, but
specifying the grid is not quite so straightforward in either case. For a
table one could have one column be an axis (e.g. 'y') and save the y
values, but then the x values are the table column 'names', which I think
have to be strings. Nothing is fundamentally unworkable about that, it's
just a little awkward to have string versions of the numeric axis values.
If I output an image instead, then I'm left with specifying the grid
locations in the header.
So, I do have ways of doing what I want to do, but it just seems that the
ways I've thought of are not the simplest ways. And I wonder if there
isn't some other way that I haven't thought of. Any hints on this would be
appreciated. Maybe some other output format (e.g. hdf5) would be better?
Jonathan D. Slavin Harvard-Smithsonian CfA
jslavin at cfa.harvard.edu 60 Garden Street, MS 83
phone: (617) 496-7981 Cambridge, MA 02138-1516
fax: (617) 496-7577 USA
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