The University of Leicester Full-Physics Retrieval Algorithm (UoL-FP) is an optical estimation retrieval algorithm for TanSat (and other satellites). It is also known as OCFP as it was initially developed to work for the OCO (Orbiting Carbon Observatory) satellite, but has been adapted for other instruments.

For the CO2 Full Physics product, it utilises the O2-A absorption band along with the weak CO2 band located at 1.6 um respectively to retrieve XCO2 (the column-average dry-air mole fraction of atmospheric CO2). The explicit consideration of scattering by this approach reduces potential systematic biases due to clouds or aerosols.