<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Nathan,<div><br></div><div>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). </div><div><br></div><div>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:</div><div><br></div><div><a href="http://yt-project.org/docs/dev-3.0/cookbook/fits_radio_cubes.html#radio-cubes">http://yt-project.org/docs/dev-3.0/cookbook/fits_radio_cubes.html#radio-cubes</a></div><div><br></div><div>we specified proj_style="sum" which eliminates the path length and simply sums everything along this axis. </div><div><br></div><div>Best,</div><div><br></div><div>John</div><div><br></div><div>On Jul 7, 2014, at 11:43 AM, Nathan Goldbaum <<a href="mailto:nathan12343@gmail.com">nathan12343@gmail.com</a>> wrote:</div><div><div><div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Hi all,<div><br></div><div>I think this question is primarily for John ZuHone, but please feel free to jump in.</div><div><br></div><div>I'm currently looking at the FITS frontend for my scipy talk.</div>
<div><br></div><div>I just made a projection of the M33 HI data cube we have on the data hub. The image is here: <a href="http://i.imgur.com/kcw98g8.png">http://i.imgur.com/kcw98g8.png</a></div><div><br></div><div>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.</div>
<div><br></div><div>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?</div>
<div><br></div><div>Thanks for your advice,</div><div><br></div><div>Nathan</div></div>
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