===== Measuring atmospheric properties =====
===== Further Reading =====
  * [[http://www.sciencemag.org/content/312/5774/713.abstract|Hagit Messer; Artem Zinevich; Pinhas Alpert3, "Environmental Monitoring by Wireless Communication Networks"]]
  * Thomas Feuerle, "GPS- und Ionosphärenmonitoring mit Low-Cost GPS-Empfängern", ISBN:9783928628549