Recently, researchers have found a way to measure fluorescence from satellite imageries. This fluorescence gives information that can help estimate the yield of crops.
This was tried back in the 1970's for oil spill identification, you can read about this in:
C. E. Brown, R. D. Nelson, M. F. Fingas, and J. V. Mullin, Laser fluorosensor overflights of the Santa Barbara oil seeps, Spill Sci. Technol. B. 3(4), 227-230 (1996).
81 C. E. Brown and M. F. Fingas, Review of the development of laser fluorosensors for oil spill application, Mar. Pollut. Bull. 47(9-12), 477-484 (2003).
I wrote a review that covered some of this back in the early 2000's: Analysis of crude petroleum oils using fluorescence spectroscopy. A.G. Ryder, Reviews in Fluorescence, Annual volumes 2005, 169-198, (2005), ISBN: 0-387-23628-7.