[lsst-dm-stack-users] Using the DM stack without astrometry

[Dustin Lang]

Hi Debbie,

Simon and I recently worked through a similar problem with a "grid" imsim image, 
and in the end it turned out that the imsims should have close-enough WCS 
headers that meas_astrom can lock them down; do this by setting:

forceKnownWcs=True
calculateSip=True

(We also found, in that case, that Simon had cleverly randomized the star 
positions to try to help out the astrometry solution, except due to a 
book-keeping problem two different randomizations were applied; worth checking 
that your grids don't have the same problem?)

cheers,
dustin


On Wed, 29 May 2013, Deborah Joanne Bard wrote:

> Hello,
> I'm playing with using the DM stack to process ImSim images, and I'd like to 
> "turn off" astrometry. For example, if I have a grid of stars, or an image 
> containing only galaxies, then I can't use the stack because the astrometry 
> fails. I'd basically like to use the stack the same way I use SouceExtractor 
> - to get hold of the DM photometry products (coords, magnitudes, fwhm, shape, 
> classification_extendedness).
>  Is this possible? Is this advisable?
>
>  cheers,
>  Debbie
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