Articles | Volume 20, issue 9
https://doi.org/10.5194/bg-20-1789-2023
https://doi.org/10.5194/bg-20-1789-2023
Research article
 | 
16 May 2023
Research article |  | 16 May 2023

Continuous ground monitoring of vegetation optical depth and water content with GPS signals

Vincent Humphrey and Christian Frankenberg

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Revised manuscript accepted for BG
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Cited articles

Bilich, A., Axelrad, P., and Larson, K. M.: Scientific Utility of the Signal-to-Noise Ratio (SNR) Reported by Geodetic GPS Receivers, Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), 1999–2010, 2007. 
Camps, A., Alonso-Arroyo, A., Park, H., Onrubia, R., Pascual, D., and Querol, J.: L-Band Vegetation Optical Depth Estimation Using Transmitted GNSS Signals: Application to GNSS-Reflectometry and Positioning, Remote Sens., 12, 2352, https://doi.org/10.3390/rs12152352, 2020. 
Carreno-Luengo, H., Luzi, G., and Crosetto, M.: Above-Ground Biomass Retrieval over Tropical Forests: A Novel GNSS-R Approach with CyGNSS, Remote Sens., 12, 1368, https://doi.org/10.3390/rs12091368, 2020. 
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Short summary
Microwave satellites can be used to monitor how vegetation biomass changes over time or how droughts affect the world's forests. However, such satellite data are still difficult to validate and interpret because of a lack of comparable field observations. Here, we present a remote sensing technique that uses the Global Navigation Satellite System (GNSS) as a makeshift radar, making it possible to observe canopy transmissivity at any existing environmental research site in a cost-efficient way.
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