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Highly accurate models of the galaxy population over cosmological volumes arenecessary in order to predict the performance of upcoming cosmologicalmissions. We present a data-driven model of the galaxy population constrainedby deep 0.1-8 $\rm \mu m$ imaging and spectroscopic data in the COSMOS survey,with the immediate goal of simulating the spectroscopic redshift performance ofthe proposed SPHEREx mission. SPHEREx will obtain over the full-sky $R\sim41$spectrophotometry at moderate spatial resolution ($\sim6"$) over the wavelengthrange 0.75-4.18 $\rm \mu m$ and $R\sim135$ over the wavelength range 4.18-5$\rm \mu m$. We show that our simulation accurately reproduces a range of knowngalaxy properties, encapsulating the full complexity of the galaxy populationand enables realistic, full end-to-end simulations to predict missionperformance. Finally, we discuss potential applications of the simulationframework to future cosmology missions and give a description of released dataproducts.

An Empirical Approach to Cosmological Galaxy Survey Simulation: Application to SPHEREx Low-Resolution Spectroscopy