Influence of flooding underneath the Amazon rainforest on Sentinel-1 backscatter
Preprint of a paper that is submitted to the "Journal of Selected Topics in Earth Observation and Remote sensing" with the following abstract:
It is widely assumed that C-Band Synthetic Aperture Radar (SAR) signal do not reach the forest floor in dense forests, and that hence C-Band SAR cannot be used for sub-canopy flood mapping in tropical forests. Indeed, flooded and non-flooded forests are not distinguishable in single C-Band acquisitions. The question is whether long-term seasonal dynamics in C- Band SAR time series data encode flooding dynamics under- neath the canopy. In this paper we investigate the relationship of Sentinel-1 backscatter with sub-canopy flooding in the Amazon rain forest. We use the Empirical Mode Decomposition to extract annual modes in the backscatter signal and use the correlation to the water level of a nearby river to understand the dynamics of the Sentinel-1 signal. Clusters of these correlations coincide well with known forest flooding areas in the VH signal. The analysis shows that the Sentinel-1 C-Band backscatter is influenced by floodings underneath the canopy in the Amazon rain forest. The presented approach could allow to systematically map flooded areas throughout tropical rain forests.
Joint project BiodivERsA: Compensation and Development Measures for Biodiversity Conservation in Wetlands of the Amazon (BONDS)
Federal Ministry of Education and ResearchFind out more...
Email Address of Submitting Authorfelix.email@example.com
ORCID of Submitting Author0000-0001-8659-4361
Submitting Author's InstitutionMax-Planck-Institute for Biogeochemistry
Submitting Author's Country