[yt-dev] Projections of FITS cubes

[Nathan Goldbaum]

On Mon, Jul 7, 2014 at 10:50 AM, John ZuHone <jzuhone at gmail.com> wrote:

> Nathan,
>
> At the moment we've left the units of all of the axes in code_length,
> which is equivalent to the FITS pixel (except in cases where the z-axis is
> rescaled, in which case along that axis it is a multiple of the pixel).
>
> For these datasets, I actually don't think that projections with a path
> length (whether in terms of length or velocity) makes a lot of sense--since
> the units along each slice are Jy/beam and the total projected intensity is
> in the same units. That's why for this image, when we used it in this
> notebook:
>

>
> http://yt-project.org/docs/dev-3.0/cookbook/fits_radio_cubes.html#radio-cubes
>
> we specified proj_style="sum" which eliminates the path length and simply
> sums everything along this axis.
>

This is what I was looking for, thank you!


> Best,
>
> John
>
> On Jul 7, 2014, at 11:43 AM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
>
> Hi all,
>
> I think this question is primarily for John ZuHone, but please feel free
> to jump in.
>
> I'm currently looking at the FITS frontend for my scipy talk.
>
> I just made a projection of the M33 HI data cube we have on the data hub.
>  The image is here: http://i.imgur.com/kcw98g8.png
>
> I know that we decided to not try to jam WCS axes into the PlotWindow
> code, instead reserving that for PlotWindowWCS.  I agree with that.
>
> However, I'm confused about the units of the z-axis.  Presumably, the
> units of the actual observation are km/s.  Did we ever investigate making
> the units of the z-axis km/s? Is that not possible at the moment due to a
> restriction that all three axes must have spatial units?
>
> Thanks for your advice,
>
> Nathan
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