Stephen Gwyn
Stephen works as a data specialist at the Canadian Astronomy Data Center. He has developed MegaPipe a pipeline to handle data from MegaCam on CFHT and WIRwolf for data from WIRcam, also on CFHT. He also designed the Solar System Object Image Search service at the CADC.
Talks
The CFIS processing pipeline
The Canada-France Imaging Survey (CFIS), will cover the northern sky
above 25 degrees galactic latitude in the u and r bands using MegaCam
mosaic imager on CFHT. The data is being processed using a modified
version of MegaPipe, the MegaCam data pipeline at the CADC. The data
is astronometrically calibrated using GAIA DR2. While the r-band data
can be easily photometrically calibrated using the Pan-STARRS 3PI
survey, the u-band is harder to calibrate. A combination of the SDSS
and the GALEX archive are used to generate in-field standards across
the sky. The calibrated individual images are resampled and coadded on
to a series of tiles evenly spaced in RA and Dec. Stellar photometry
is computed on the tile using a curve-of-growth (COG) method, with the
details of the COG generated by tracing each star back to the
individual input images.