Deep ugrizY Imaging and DEEP2/3 Spectroscopy: A Photometric Redshift
  Testbed for LSST and Public Release of Data from the DEEP3 Galaxy Redshift
  Survey
  We present catalogs of calibrated photometry and spectroscopic redshifts in
the Extended Groth Strip, intended for studies of photometric redshifts
(photo-z's). The data includes ugriz photometry from CFHTLS and Y-band
photometry from the Subaru Suprime camera, as well as spectroscopic redshifts
from the DEEP2, DEEP3 and 3D-HST surveys. These catalogs incorporate
corrections to produce effectively matched-aperture photometry across all
bands, based upon object size information available in the catalog and Moffat
profile point spread function fits. We test this catalog with a simple machine
learning-based photometric redshift algorithm based upon Random Forest
regression, and find that the corrected aperture photometry leads to
significant improvement in photo-z accuracy compared to the original SExtractor
catalogs from CFHTLS and Subaru. The deep ugrizY photometry and spectroscopic
redshifts are well-suited for empirical tests of photometric redshift
algorithms for LSST. The resulting catalogs are publicly available. We include
a basic summary of the strategy of the DEEP3 Galaxy Redshift Survey to
accompany the recent public release of DEEP3 data.
