RUSS MUNN / AGSTOCKUSA / SCIENCE PHOTO LIBRARY RUSS MUNN / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
GPS harvest monitor. Screen (upper right) for a monitoring system that uses a global positioning system (GPS) technology to map harvest yields. The GPS plots the position of the harvesting vehicle by communicating with satellites overhead in orbit around the Earth. This is a harvest of maize (Zea mays) in Illinois, USA.
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