photometric analysis

He established the value of photometric analysis of tornado pictures and films to establish wind speeds at various heights at the surface of tornado vortices.

These conclusions are supported by the optical reflection spectra, and by polarimetric and photometric analyses of the thermal radiation emitted by Mercury, day and night.

It is close on the plane of the sky to the Sagittarius Dwarf Elliptical Galaxy, which was found in 1994 through a similar photometric analysis of a star survey.