Precision approach path indicator (PAPI) measurement systems and methods are described herein. One system includes a number of light sensor modules, wherein each light sensor module is configured to determine an intensity of a beam of light from a PAPI unit, a memory, and a processor configured to execute executable instructions stored in the memory to determine a transition angle of the beam of light from the PAPI unit, an elevation angle of the beam of light with respect to horizontal, and a width of a transition region of the beam of light, based, at least in part, on the intensity of the beam of light determined by each light sensor module.