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We present an analysis of Galactic halo structure and substructure traced by~500 RR Lyrae stars in the SDSS stripe 82 region. The main result of this studyis a 2D map of the Galactic halo that reaches distances of 100 kpc and tracespreviously known and new halo substructures, such as the Sagittarius and Piscestidal streams. We also present strong direct evidence, based on both RR Lyraeand main sequence stars, that the halo stellar number density profilesignificantly steepens beyond 30 kpc from the Galactic center. Using a novelphotometric metallicity method that simultaneously combines data for RR Lyraeand main sequence stars, we show that the median metallicity of the Sagittariustrailing stream in the SDSS stripe 82 region is [Fe/H]}=-1.2 +- 0.1 dex. Inaddition to these results, we will present ongoing work on a 3D map of theGalactic halo constructed using a sample of ~4000 RR Lyrae stars that covers8500 deg^2 of northern sky and probes up to 30 kpc from the Sun.

Mapping the Galactic Halo with SDSS, LINEAR and PTF RR Lyrae Stars