Ramata Magagi
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View article: Soil Moisture Active/Passive Validation Experiment Within the Canadian Boreal Forest in 2022 (SMAPVEX22-Boreal)
Soil Moisture Active/Passive Validation Experiment Within the Canadian Boreal Forest in 2022 (SMAPVEX22-Boreal) Open
The soil moisture active passive (SMAP) validation experiment in the boreal forest took place near Candle Lake, Saskatchewan within an area previously studied as a part of the experiments conducted at the Boreal Ecosystem Research and Moni…
View article: Retrieval of Surface Soil Moisture over Wheat Fields during Growing Season Using C-Band Polarimetric SAR Data
Retrieval of Surface Soil Moisture over Wheat Fields during Growing Season Using C-Band Polarimetric SAR Data Open
Accurate estimation and regular monitoring of soil moisture is very important for many agricultural, hydrological, or climatological applications. Our objective was to evaluate potential contributions of polarimetry to soil moisture estima…
View article: Geodesic Distance Based Scattering Power Decomposition for Compact Polarimetric SAR Data
Geodesic Distance Based Scattering Power Decomposition for Compact Polarimetric SAR Data Open
We propose a geodesic distance based scattering power decomposition for compact polarimetric (CP) synthetic aperture radar (SAR) data acquired over agricultural landscapes. The proposed technique decomposes the polarized portion of the tot…
View article: Soil Moisture Retrieval During Crop Growth Cycle Using Satellite SAR Time Series
Soil Moisture Retrieval During Crop Growth Cycle Using Satellite SAR Time Series Open
Satellite SAR-based soil moisture retrieval over agricultural fields, under crop overlain conditions, is a challenging exercise. This is so because the overlying crop volume interacts with both the incoming and the backscattered radar sign…
View article: Multi-resolution soil moisture retrievals by disaggregating SMAP brightness temperatures with RADARSAT-2 polarimetric decompositions
Multi-resolution soil moisture retrievals by disaggregating SMAP brightness temperatures with RADARSAT-2 polarimetric decompositions Open
Mapping soil moisture (SM) at high spatial resolution assists to trigger important agricultural management, such as irrigation, to enhance crop yields. This study investigates disaggregation of SMAP brightness temperature (TB) using RADARS…
View article: Potential of L- and C- Bands Polarimetric SAR Data for Monitoring Soil Moisture over Forested Sites
Potential of L- and C- Bands Polarimetric SAR Data for Monitoring Soil Moisture over Forested Sites Open
This study investigates the potential of L- and C- bands Polarimetric Synthetic Aperture Radar (PolSAR) data to monitor soil moisture over the forested sites of SMAP Validation Experiment 2012 (SMAPVEX12). The optimal backscattering coeffi…
View article: Spatial Gap-Filling of SMAP Soil Moisture Pixels Over Tibetan Plateau via Machine Learning Versus Geostatistics
Spatial Gap-Filling of SMAP Soil Moisture Pixels Over Tibetan Plateau via Machine Learning Versus Geostatistics Open
Soil moisture (SM) is a key variable in ecology, environment, agriculture, and hydrology. The Soil Moisture Active Passive (SMAP) satellite provides global SM products with reliable accuracy since 2015. However, significant gaps of SMAP SM…
View article: Soil moisture retrieval over a site of intensive agricultural production using airborne radiometer data
Soil moisture retrieval over a site of intensive agricultural production using airborne radiometer data Open
This study investigates soil moisture retrievals using airborne passive microwave data at two different resolutions collected during the Soil Moisture Active Passive Validation Experiments in 2012 and 2016 (SMAPVEX12 and SMAPVEX16-MB). Bas…
View article: Soil Moisture Retrievals by Combining Passive Microwave and Optical Data
Soil Moisture Retrievals by Combining Passive Microwave and Optical Data Open
This paper aims to retrieve the temporal dynamics of soil moisture from 2015 to 2019 over an agricultural site in Southeast Australia using the Soil Moisture Active Passive (SMAP) brightness temperature. To meet this objective, two machine…
View article: Improving the Estimation of Water Level over Freshwater Ice Cover using Altimetry Satellite Active and Passive Observations
Improving the Estimation of Water Level over Freshwater Ice Cover using Altimetry Satellite Active and Passive Observations Open
Owing to its temporal resolution of 10-day and its polar orbit allowing several crossings over large lakes, the US National Aeronautics and Space Administration (NASA) and the French Centre National d’Etudes Spatiales (CNES) missions inclu…
View article: Assessing SMAP Soil Moisture Scaling and Retrieval in the Carman (Canada) Study Site
Assessing SMAP Soil Moisture Scaling and Retrieval in the Carman (Canada) Study Site Open
Core Ideas Upscaling methods compared in situ measures with soil moisture from the SMAP satellite. The accuracy of SMAP soil moisture products in annual cropland was assessed. The spatial representativeness of sparse in situ networks was d…
View article: Soil moisture retrieval with airborne PALS instrument over agricultural areas in SMAPVEX16
Soil moisture retrieval with airborne PALS instrument over agricultural areas in SMAPVEX16 Open
NASA's SMAP (Soil Moisture Active Passive) calibration and validation program revealed that the soil moisture products are experiencing difficulties in meeting the mission requirements in certain agricultural areas. Therefore, the mission …
View article: Evaluation of Simplified Polarimetric Decomposition for Soil Moisture Retrieval over Vegetated Agricultural Fields
Evaluation of Simplified Polarimetric Decomposition for Soil Moisture Retrieval over Vegetated Agricultural Fields Open
This paper investigates a simplified polarimetric decomposition for soil moisture retrieval over agricultural fields. In order to overcome the coherent superposition of the backscattering contributions from vegetation and underlying soils,…
View article: Filtering Global Land and Surface Altimetry Data (GLA14) for Elevation Accuracy Determination
Filtering Global Land and Surface Altimetry Data (GLA14) for Elevation Accuracy Determination Open
This paper presents a filtering method for ices at Global Land Surface Altimetry data (GLA14), which is based on indicators to detect potentially contaminated GLA14 elevation points. Potential contamination sources include attitude misc…