A5011824547- Soil Moisture and Remote Sensing
- Precipitation Measurement and Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Cryospheric studies and observations
- Plant Water Relations and Carbon Dynamics
- Soil Geostatistics and Mapping
- Climate change and permafrost
- Remote Sensing in Agriculture
- Remote Sensing and LiDAR Applications
- Landslides and related hazards
- Hydrology and Watershed Management Studies
- Ocean Waves and Remote Sensing
- Soil erosion and sediment transport
- Arctic and Antarctic ice dynamics
- Solar Radiation and Photovoltaics
- Greenhouse Technology and Climate Control
- Irrigation Practices and Water Management
- Tree Root and Stability Studies
- Oceanographic and Atmospheric Processes
- Soil and Unsaturated Flow
- Climate variability and models
- Species Distribution and Climate Change
- Aeolian processes and effects
- Horticultural and Viticultural Research
- Urban Heat Island Mitigation
Centre d'Études Spatiales de la Biosphère
2015-2024
Université Toulouse III - Paul Sabatier
2015-2024
Institut de Recherche pour le Développement
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Université de Toulouse
2016-2024
Laboratoire atmosphères, milieux, observations spatiales
2010-2023
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2022-2023
Cadi Ayyad University
2022
Centre National de Recherches Météorologiques
2017-2018
Centre National d'Études Spatiales
2017
This paper presents a technique for the mapping of soil moisture and irrigation, at scale agricultural fields, based on synergistic interpretation multi-temporal optical Synthetic Aperture Radar (SAR) data (Sentinel-2 Sentinel-1). The Kairouan plain, semi-arid region in central Tunisia (North Africa), was selected as test area this study. Firstly, an algorithm direct inversion Water Cloud Model (WCM) developed spatialization water content between 2015 2017. retrieved from these observations...
Monitoring of water resources and a better understanding the eco-hydrological processes governing their dynamics are necessary to anticipate develop measures adapt climate water-use changes. Focusing on this aim, research project carried out within framework French–Moroccan cooperation demonstrated how remote sensing can help improve monitoring modelling in semi-arid Mediterranean regions. The study area is Tensift Basin located near Marrakech (Morocco) – typical Southern catchment with...
Abstract Moutain snow cover is highly variable both spatially and temporally has a tremendous impact on ecosystems human activities. Numerical models provide continuous estimates of the variability properties in time space. However, they suffer from large uncertainties, for instance originating errors meteorological inputs. Here, we show that depth at 250 m spatial resolution can be well simulated by assimilating maps satellite photogrammetry detailed snowpack model. The assimilation single...
The aim of this paper is to propose a methodology combing multi-temporal X-band SAR images (TerraSAR-X) with continuous ground thetaprobe measurements, for the retrieval surface soil moisture and texture at high spatial resolution. Our analysis based on seven radar acquired 36° incidence angle in HH polarization, over semi-arid site Tunisia (North Africa). estimations are an empirical change detection approach using TerraSAR-X data auxiliary network measurements. Two assumptions were tested:...
Global Navigation Satellite System-Reflectometry (GNSS-R) has emerged as a remote sensing tool, which is complementary to traditional monostatic radars, for the retrieval of geophysical parameters related surface properties. In present paper, we describe new polarimetric GNSS-R system, referred GLObal navigation satellite system Reflectometry Instrument (GLORI), dedicated study land surfaces (soil moisture, vegetation water content, forest biomass) and inland bodies. This was installed...
The "Cooperative Airborne Radiometer for Ocean and Land Studies" (CAROLS) L-Band radiometer was designed built as a copy of the EMIRAD II constructed by Technical University Denmark team. It is fully polarimetric direct sampling correlation radiometer. installed on board dedicated French ATR42 research aircraft, in conjunction with other airborne instruments (C-Band scatterometer-STORM, GOLD-RTR GPS system, infrared CIMEL visible wavelength camera). Following initial laboratory...
Water scarcity is one of the main factors limiting agricultural development in semi-arid areas. Remote sensing has long been used as an input for crop water balance monitoring. The increasing availability high resolution repetitivity remote (forthcoming Sentinel-2 mission) offers unprecedented opportunity to improve this In study, regional consumption was estimated with SAMIR software (SAtellite Monitoring IRrigation) using FAO-56 dual coefficient model fed NDVI image time series providing...
The aim of this study is to analyze the sensitivity airborne Global Navigation Satellite System Reflectometry (GNSS-R) on soil surface and vegetation cover characteristics in agricultural areas. Airborne polarimetric GNSS-R data were acquired context GLORI’2015 campaign over two sites Southwest France June July 2015. Ground measurements parameters (moisture content) (leaf area index (LAI), height) recorded for different types crops (corn, sunflower, wheat, soybean, vegetable) simultaneously...
Abstract. In semiarid areas, agricultural production is restricted by water availability; hence, efficient management a major issue. The design of tools providing regional estimates evapotranspiration (ET), one the most relevant balance fluxes, may help sustainable resources. Remote sensing provides periodic data about actual vegetation temporal dynamics (through normalized difference index, NDVI) and availability under stress surface temperature Tsurf), which are crucial factors controlling...
The surface soil moisture (SSM) is a key variable for monitoring hydrological, meteorological and agricultural processes. It can be estimated from active passive microwave remote sensing data. While coarse-resolution SSM products (> 1 km) have already been evaluated large range of ecosystems, such assessments lack very high-spatial-resolution products, although they are increasingly available thanks to high-resolution radar data or disaggregation methods applied coarse-scale products. Within...
Abstract. We present a unique meteorological and snow observational dataset in Mount Lebanon, mountainous region with Mediterranean climate, where snowmelt is an essential water resource. The study covers the recharge area of three karstic river basins (total 1092 km2 elevation up to 3088 m). consists (1) continuous height observations, (2) snowpack field measurements, (3) medium-resolution satellite cover data. measurements at automatic weather stations (MZA, 2296 m; LAQ, 1840 CED, 2834 m...
The objective of this study is to propose a mapping surface soil moisture ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SSM</i> ) using airborne measurements based on the GLObal Navigation Satellite System Reflectometry Instrument (GLORI), polarimetric instrument. GNSS-R were acquired at agricultural Urgell site in Spain July 2021. In situ describing and roughness vegetation cover leaf area index then obtained simultaneously with flight...
Recent studies have shown that radar temporal coherence over tropical and boreal forests undergoes a diurnal cycle as result of combined effect the wind-induced motion scatterers change displacement water within plant in response to transpiration process. Within this context, objective paper is investigate, for first time, wheat crops relation its development physiological functioning throughout agricultural season. A ground-based experiment was installed Morocco, targeting field during 2020...
In this paper, different methods are proposed for the detection and mitigation of undesirable effects radio-frequency interference (RFI) in microwave radiometry. The first these makes use kurtosis to detect presence non-Gaussian signals, whereas second imposes a threshold on standard deviation brightness temperatures order distinguish natural-emission variations from RFI. Finally, third approach is based applied fourth Stokes parameters. All have been tested, with cooperative airborne...
Lebanon has experienced serious water scarcity issues recently, despite being one of the wealthiest countries in Middle East for resources. A large fraction resources originates from melting seasonal snow on Mount Lebanon. Therefore, continuous and systematic monitoring Lebanese snowpack is becoming crucial. The top punctuated by karstic hollows named sinkholes, which play a key role hydrological regime as natural reservoirs. However, these reservoirs remains challenging using traditional...
A renewal of interest for the radiometric L-band Sea Surface Salinity (SSS) remote sensing appeared in 1990s and led to Soil Moisture Ocean (SMOS) satellite launched November 2009 Aquarius mission (launched June 2011). However, due low signal noise ratio, retrieving SSS from radiometry is very challenging. In order validate improve radiative transfer model salinity retrieval method used SMOS data processing, Cooperative Airborne Radiometer Land Studies (CAROLS) was developed. We analyze here...
A method to identify and mitigate radio frequency interference (RFI) in microwave radiometry based on the use of a spectrum analyzer has been developed. This tested with CAROLS L-band airborne radiometer data that are strongly corrupted by RFI. RFI is major limiting factor passive remote sensing interpretation. Although 1.400-1.427 GHz bandwidth protected, sources close these frequencies still capable corrupting radiometric measurements. In order reduce detrimental effects brightness...
This study aimed to monitor vegetation using C-band radar data at a sub-daily time step. To this end, measurements tower-mounted antennas with 15-min step, along physiology-related information (sapflow and micrometric dendrometry), were acquired quasi-continuously from March 2020 December 2021 in an olive orchard located near Marrakech, Morocco. The focused on temporal coherence, whose clear diurnal cycle (highest night lowest the end of afternoon) had been highlighted over tropical boreal...
The SMOS satellite mission, launched in 2009, allows global soil moisture estimations to be made using the L-band Microwave Emission of Biosphere (L-MEB) model, which simulates microwave emissions produced by soil–vegetation layer. This model was calibrated various sources situ and airborne data. In present study, we propose evaluate L-MEB on basis a large set data, recorded CAROLS radiometer during course 20 flights over South West France (the SMOSMANIA site), supported simultaneous...
The aim of this research is to analyze the potential use Global Navigation Satellite System (GNSS) signals for monitoring in situ vegetation characteristics. An instrument, based on a pair low-cost receivers and antennas, providing continuous measurements all available Positioning (GPS) satellite proposed determination signal attenuation caused by sunflower cover. Experimental campaigns with combined ground truth vegetation, were performed over nonirrigated test field period more than two...
Abstract. EvapoTranspiration (ET) is an important component of the water cycle, especially in semi-arid lands. Its quantification crucial for a sustainable management scarce resources. A way to quantify ET exploit available surface temperature data from remote sensing as signature energy balance, including latent heat flux. Remotely sensed balance models enable estimate stress levels and, turn, status most continental surfaces. The evaporation and transpiration components are also just...