THE PROPOSED EFFORT WILL DOCUMENT AND ASSESS POTENTIAL SOURCES OF UNCERTAINTY IN COMPARISONS BETWEEN CALIBRATED OBSERVATIONS OF THE MOON BY MULTIPLE SATELLITES. THE WORK WILL QUANTIFY KEY UNCERTAINTY SOURCES IN THE LUNAR SATELLITE OBSERVATIONS. TO THIS END THE PROPOSED STUDY WILL BUILD ON PRIOR WORK AND DATA TO UNDERSTAND ERROR SOURCES STEMMING FROM SCAN GEOMETRY SIZE-OF-SOURCE EFFECT AND VARIOUS KNOW DETECTOR BIASES. THE SUCCESS OF THE TERRA PROJECT RELIES ON THE RESULTS OF STUDIES EVALUATING THE QUALITY OF ITS IMAGING SENSORS. THE PROPOSED WORK WILL PROVIDE THE TERRA COMMUNITY AND OTHER SATELLITE-BASED IMAGERS WITHIN NASA EARTH SCIENCES WITH THE INFORMATION NEEDED TO EXPLOIT LUNAR-BASED OBSERVATIONS AS A RADIOMETRIC CALIBRATION TOOL. THE RESULTS WILL BE OF INTEREST TO LANDSAT NEXT THE SUSTAINABLE LAND IMAGING PROGRAM THE SURFACE BIOLOGY AND GEOLOGY PROJECTS AND PLANKTON AEROSOL CLOUD AND OCEAN ECOSYSTEM MISSION. THE RESULTS WILL ALSO HAVE BROADER APPLICABILITY TO THE CALIBRATION OF ANY OF THE NASA EARTH IMAGING ASSET OPERATING IN THE SOLAR REFLECTIVE AND ALLOW NASA ASSETS TO BE COMPARED DIRECTLY WITH INTERNATIONAL AND COMMERCIAL IMAGERS.