The Use of Gnss Signals for Estimating Soil Moisture: the Leimon Experiment
نویسندگان
چکیده
The use of microwave radar and radiometer in estimating soil moisture and vegetation parameters of land has shown a good potential. However, both experimental activities and theoretical results seem to indicate that important limitations to the actual use of monostatic radar exist. They are: in soil moisture applications the simultaneous disturbing effects of soil roughness and vegetation cover; in vegetation monitoring, the early saturation of its response with respect to plant biomass. As far as radiometric measurements are concerned, the ground resolution required in many applications remains a challenging issue.
منابع مشابه
Interactive comment on “Use of GNSS SNR data to retrieve soil moisture and vegetation variables
This paper presents a case study applying GNSS signals, which were reflected on the ground surface (soil, vegetation surface) to derive soil moisture and vegetation height data over a wheat crop field. The GPS antenna was installed at a height of 2.51 m. Soil moisture was retrieved as long as the vegetation height was lower than ∼20 cm. However, with a further increase in plant height, it was n...
متن کاملSoil Moisture & Snow Properties Determination with GNSS in Alpine Environments: Challenges, Status, and Perspectives
Moisture content in the soil and snow in the alpine environment is an important factor, not only for environmentally oriented research, but also for decision making in agriculture and hazard management. Current observation techniques quantifying soil moisture or characterizing a snow pack often require dedicated instrumentation that measures either at point scale or at very large (satellite pix...
متن کاملSoil Moisture Monitoring Using GNSS-R Signals; First Experimental Results with the SAM Sensor
Observing the Earth surface with Global Navigation Satellite Systems (GNSS) reflected signals has become a noteworthy remote sensing technique for the scientific community. The growing interest in GNSS as a remote sensing tool is due to its global availability and the carrier frequencies used. In fact, L-band, in which all current and next-future Global Navigation Satellite Systems emit, is a p...
متن کاملMultisensor Experiments over Vineyard: New Challenges for the Gnss-r Technique
An airborne campaign was performed during August, 2014 in an agricultural area in the Duero basin (Spain) in order to appraise the synergy between very different sources of Earth Observation imagery, and very different instruments for soil moisture retrieval. During the flight, an intensive field campaign comprising soil, plant and spectral measurements was carried out. An innovative sensor bas...
متن کاملGlobal Navigation Satellite Systems Reflectometry as a Remote Sensing Tool for Agriculture
The use of Global Navigation Satellite Systems (GNSS) signals for remote sensing applications, generally referred to as GNSS-Reflectometry (GNSS-R), is gaining increasing interest among the scientific community as a remote sensing tool for land applications. This paper describes a long term experimental campaign in which an extensive dataset of GNSS-R polarimetric measurements was acquired over...
متن کامل