Influence of Incidence Angle in the Correlation of C-band Polarimetric Parameters with Biophysical Variables of Rain-fed Crops

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Title: Influence of Incidence Angle in the Correlation of C-band Polarimetric Parameters with Biophysical Variables of Rain-fed Crops
Authors: Valcarce-Diñeiro, Rubén | Lopez-Sanchez, Juan M. | Sánchez, Nilda | Arias-Pérez, Benjamín | Martínez-Fernández, José
Research Group/s: Señales, Sistemas y Telecomunicación
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Keywords: Radar | Agriculture | Polarimetry
Knowledge Area: Teoría de la Señal y Comunicaciones
Issue Date: 8-Mar-2019
Publisher: Taylor & Francis
Citation: Canadian Journal of Remote Sensing. 2018, 44(6): 643-659. doi:10.1080/07038992.2019.1579051
Abstract: A multi-temporal field experiment was conducted within the Soil Measurement Stations Network of the University of Salamanca (REMEDHUS) in Spain in order to retrieve useful crop information. The objective of this research was to evaluate the potential of polarimetric observations for crop monitoring by exploiting a time series of 20 quad-pol RADARSAT-2 images at different incidence angles (i.e. 25°, 31°, and 36°) during an entire growing season of rain-fed crops, from February to July 2015. The time evolution of 6 crop biophysical variables was gathered from the field measurements, whereas 10 polarimetric parameters were derived from the images. Thus, a subsequent correlation analysis between both datasets was performed. The study demonstrates that the backscattering ratios (HH/VV and HV/VV), the normalized correlation between HH and VV (γHHVV), and the dominant alpha angle (α1), showed significant and relevant correlations with several biophysical variables such as biomass, height, or leaf area index (LAI) at incidence angles of 31° or 36°. The joint use of data acquired with different beams could be exploited effectively to increase the refresh rate of information about crop condition with respect to a single incidence acquisition scheme.
Sponsor: This study was supported by the Spanish Ministry of Economy and Competitiveness and the Spanish Ministry of Science, Innovation and Universities, [Projects ESP2015-67549-C3-3, ESP2017-89463-C3-3-R, and TEC2017-85244-C2-1-P] and the European Regional Development Fund (FEDER).
ISSN: 1712-7971
DOI: 10.1080/07038992.2019.1579051
Language: eng
Type: info:eu-repo/semantics/article
Rights: © CASI
Peer Review: si
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