1. A method comprising: receiving an indication of a first spectral measurement of one or more specimen by a reference metrology system, wherein the first spectral measurement is determined based at least in part on an amount of raw measurement data collected by the reference metrology system and one or more system parameter values associated with the reference metrology system; receiving an amount of raw measurement data collected by a target metrology system based on a measurement of the one or more specimen by the target metrology system; determining values of one or more system parameters associated with the target metrology system such that an error function that includes a difference between the first spectral measurement and a second spectral measurement of the one or more specimen by the target metrology system is minimized, wherein the second spectral measurement is determined based at least in part on the amount of raw measurement data collected by the target metrology system and the values of the one or more system parameters associated with the target metrology system; and storing the values of the one or more system parameters of the target metrology system in a memory.