This work describes the work done during the first year of a contract to analyze and model data from high altitude background measurements. The contract has 5 separate tasks: 1. MSX Data Analysis: 2.1 Trace Species in Modtran, 2.2 Radiance Inversion Techniques, 2.3 Mesospheric Radiance Model, 2.4 FAScode for the Environment (FASE). In Task 1, techniques for analyzing data from the Midcourse Space Experiment (MSX) are developed, including developing experiment plans, developing software for the automated analysis of data from visible and ultraviolet imagers, and developing techniques for correlating data from meteorological satellites with MSX data. In Task 2.2, a package for the general inversion for advanced retrieval of atmospheric species from high spectral resolution measurements is described. In Task 2.4, progress in the development of the line-by-line atmospheric transmittance/radiance program FASE (FAScode for the Environment) is described.