The ion drift velocities and electric field derived from the Assimilative Mapping of Ionospheric Electrodynamics technique (AMIE) are compared with the same parameters observed by the Defense Meteorological Satellite Program's (DMSP) Special Sensor--Ions, Electrons, and Scintillation (SSIES) instrument. In addition the along-track cross polar cap potential, the correlation between the curves, and other metrics are compared and those results are binned by various criteria. The criteria include spacecraft, year, season, and magnetic activity level. We observed a reasonable correlation between the AMIE results and DMSP data with respect to the along-track potential, though the AMIE results tend to show a lower potential by some 30--50 percent, depending on spacecraft and orbit. Spacecraft in the same general orbits show similar relations with AMIE, implying that there is good intersatellite calibration for the DMSP array. There is a great deal of variability in the correlation, depending on season and activity level, and correlations with some of the spacecraft show a solar cycle dependance. It is further found that when we set a multifaceted criteria on each orbit for a DMSP-AMIE match, including along-track potential, Vy correlation, and peak potential locations, the results correspond between 35% and 55% for the dawn-dusk spacecraft, while they only correspond 7%--12% of the time for noon-midnight satellites.