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Airborne Active Optical Sensors (AOS) For Photosynthetically-Active Biomass Sensing: Current Status And Future Opportunities
1
K. H. Holland,
2
D. W. Lamb
1. Holland Scientific, Inc.
2. University of New England
The first published deployment of an active optical reflectance sensor (AOS) in a low-flying aircraft in 2009 catalyzed numerous developments in both sensor development and sensor platform integration. Integral to these sensors is a modulated light source composed of high power LED technology that emits high radiance polychromatic light. The sensor easily mounts to agricultural aircraft and can sense agricultural landscapes at altitudes from a few meters to altitudes exceeding 40 meters while traveling at velocities of more than 270 km/h. The rather large sensor-to-canopy measurement range allows the sensor to accurately measure ratio-based spectral reflectance indices such as the NDVI over fields with rolling terrain. Two versions of the sensor have since been developed and tested. A key advantage of airborne AOS is that they provide ratio-based index values unaffected by path radiance. This alone offers a viable, large scale sensing technique for researchers interested in plant and soil moisture investigations using the ‘reflectance index-temperature’ space concept or for the large scale, yet location specific conversion of ‘top-of-atmosphere’ vegetation indices, as derived from satellite imagery to the ‘top- of-canopy’ values
Keyword
: Active optical sensing, Thermal infrared, NDVI, Normalized difference vegetation index, SR, Simple ratio index, Red-edge, Plant and soil moisture status, AOS
K. H. Holland
D. W. Lamb
Proximal Sensing in Precision Agriculture
Oral
2014
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