To help prepare for the massive amount of data that will be generated by the Large Synoptic Survey Telescope (LSST), this project aims to develop a comprehensive workflow starting from a structure formation simulation to the creation of sky maps with realistic galaxies. The team’s work will lead to one of the largest, most detailed synthetic sky maps ever created, as well as an end-to-end pipeline for LSST data processing and analysis on ALCF supercomputers.