Sensitivity of TDS-1 GNSS-R reflectivity to soil moisture: global and regional differences and impact of different spatial scales
Visualitza/Obre
Cita com:
hdl:2117/125825
Tipus de documentArticle
Data publicació2018-11-01
EditorMultidisciplinary Digital Publishing Institute (MDPI)
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
The potential of Global Navigation Satellite Systems-Reflectometry (GNSS-R) techniques to estimate land surface parameters such as soil moisture (SM) is experimentally studied using 2014-2017 global data from the UK TechDemoSat-1 (TDS-1) mission. The approach is based on the analysis of the sensitivity to SM of different observables extracted from the Delay Doppler Maps (DDM) computed by the Space GNSS Receiver-Remote Sensing Instrument (SGR-ReSI) instrument using the L1 (1575.42 MHz) left-hand circularly-polarized (LHCP) reflected signals emitted by the Global Positioning System (GPS) navigation satellites. The sensitivity of different GNSS-R observables to SM and its dependence on the incidence angle is analyzed. It is found that the sensitivity of the calibrated GNSS-R reflectivity to surface soil moisture is ~ 0.09 dB/% up to 30° incidence angle, and it decreases with increasing incidence angles, although differences are found depending on the spatial scale used for the ground-truth, and the region. The sensitivity to subsurface soil moisture has been also analyzed using a network of subsurface probes and hydrological models, apparently showing some dependence, but so far results are not conclusive. © 2018 by the authors.
CitacióCamps, A., Vall-llossera, M., Park, H., Portal, G., Rossato, L. Sensitivity of TDS-1 GNSS-R reflectivity to soil moisture: global and regional differences and impact of different spatial scales. "Remote sensing", 1 Novembre 2018, vol. 10, núm. 11, p. 1856-1 / 1856-19
ISSN2072-4292
Versió de l'editorhttps://www.mdpi.com/2072-4292/10/11/1856
Col·leccions
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
remotesensing-10-01856.pdf | 11,64Mb | Visualitza/Obre |