[yt-users] PPV cube

[John ZuHone]

Hi Dave,

Sorry, what do you mean by the "original dumb 3D cube"? Do you mean the original spatial dataset?

The PPVCube is a reduction of data, specifically a projection along a spatial axis, within a number of spectral bins. So though you gain information by creating a velocity axis, you also lose a spatial dimension. 

So in that sense you can't get the original data back from the cube--you have to work with the original dataset itself.

Best,

John

John ZuHone
Harvard-Smithsonian Center for Astrophysics 

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http://www.jzuhone.com

> On Mar 2, 2016, at 11:15 AM, David Collins <dcollins4096 at gmail.com> wrote:
> 
> Hi, Everybody!
> 
> The PPV cube functionality is completely sweet.  Thanks so much!  
> 
> I have one question about it.  I built my cube as described by the docs, wrote to a fits file, then read the fits file with yt.load.  If I then want the original dumb three dimensional cube, what's the simplest way to get back to it?  I usually use 
> >>> ds.index.grids
> when I want the raw data, but that gives me an odd list of 27 FITS_grid objects.  Is covering_grid the way to get back to the raw data in this sense?
> 
> For this application, I'm working with some other packages that make it easier for me to do mask operations on the cube, rather than use yt regions as I normally would.  
> 
> d.
> 
> 
> 
> -- 
> -- Sent from a computer.
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