Open AccessWetland monitoring with Global Navigation Satellite System reflectometry
Author(s) -
Nghiem Son V.,
Zuffada Cinzia,
Shah Rashmi,
Chew Clara,
Lowe Stephen T.,
Mannucci Anthony J.,
Cardellach Estel,
Brakenridge G. Robert,
Geller Gary,
Rosenqvist Ake
Publication year - 2017
Publication title -
earth and space science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.843
H-Index - 23
ISSN - 2333-5084
DOI - 10.1002/2016ea000194
Subject(s) - gnss applications , wetland , environmental science , remote sensing , satellite , reflectometry , geology , computer science , ecology , time domain , engineering , computer vision , biology , aerospace engineering
Information about wetland dynamics remains a major missing gap in characterizing, understanding, and projecting changes in atmospheric methane and terrestrial water storage. A review of current satellite methods to delineate and monitor wetland change shows some recent advances, but much improved sensing technologies are still needed for wetland mapping, not only to provide more accurate global inventories but also to examine changes spanning multiple decades. Global Navigation Satellite Systems Reflectometry (GNSS‐R) signatures from aircraft over the Ebro River Delta in Spain and satellite measurements over the Mississippi River and adjacent watersheds demonstrate that inundated wetlands can be identified under different vegetation conditions including a dense rice canopy and a thick forest with tall trees, where optical sensors and monostatic radars provide limited capabilities. Advantages as well as constraints of GNSS‐R are presented, and the synergy with various satellite observations are considered to achieve a breakthrough capability for multidecadal wetland dynamics monitoring with frequent global coverage at multiple spatial and temporal scales.