The MTI Experiments Committee accepted a Tasking Proposal in 2001 for the Multispectral Thermal Imager (MTI) to make observations of Yellowstone National Park. Initial goals for this work were twofold. The first goal was to investigate Yellowstone National Park as a vicarious calibration site. The second goal was to gain experience in working with relatively high spatial resolution multispectral data whose near simultaneously imaged bands span the spectrum from the visible through the mid wave (roughly 3 μm to 5 μm) and long wave (roughly 8 μm to 12 μm) infrared atmospheric windows. Various sites in the Park were observed at various times, starting in June, 2001 and on-going through January of 2002. This paper reports on the progress of this work, summarizes the observations, provides a snapshot of preliminary forays into the analysis, and suggests directions for further exploitation of the data. Plans for the acquisition of more imagery in the spring and early summer of 2002 are in place.