On bach, make sure you source the dataman startup file:
source ~dataman/.bashrc
Some example processed pointings can be found here:
$DESDATA/wlbnl/{wlserun}
Where $DESDATA is an environment variable set in ~dataman/.bashrc. It points to the DES data root directory.
The {wlserun} is a run of the single epoch weak lensing pipeline. For example, for run wlse0003:
$DESDATA/wlbnl/wlse0003
Each sub-directory is a single pointing name, also known as the exposure name.
Within each pointing directory there are files for each of the 62 ccds. These files are as follows
{wlserun}_{pointing}_{ccd}_{wltype}{extension}
Here are examples for run wlse0003 , pointing "decam--24--37-i-7" and ccd 62:
wlse0003_decam--24--37-i-7_62_fitpsf.fits Fitted PSF function
wlse0003_decam--24--37-i-7_62_psf.fits Shapelets decompositions for PSF stars.
wlse0003_decam--24--37-i-7_62_qa.dat The QA output used by DESDM
wlse0003_decam--24--37-i-7_62_shear.fits The shear and shapelet decompositions for all objects.
wlse0003_decam--24--37-i-7_62_stars.fits The output of basic size measurement and star galaxy separation.
wlse0003_decam--24--37-i-7_62_stat.json Some metadata for the processing.
The files "_stars.fits" and "_shear.fits" correspond row-by-row.
The file "_psf.fits" is measurements of shapelets for the chosen PSF stars,
so you must match to the others by id.
I recommend using python. See python setup for how to set up your python
environment and ipython for your interactive sessions.
To read data, import the esutil package and use the io.read()
function. esutil contains a patched version of pyfits and is
recommended until the patches make it into the main pyfits
The following example shows how to make
a size-magnitude diagram from the output of findstars
This page shows how to extract e1/e2 for the PSF stars: