TY  - JOUR
AU  - Essebtey, Salma El Idrissi
AU  - Villard, Ludovic
AU  - Borderies, Pierre
AU  - Koleck, Thierry
AU  - Burban, Benoït
AU  - Le Toan, Thuy
PY  - 2021//
TI  - Long-Term Trends of P-Band Temporal Decorrelation Over a Tropical Dense Forest-Experimental Results for the BIOMASS Mission
JO  - IEEE Transactions on Geoscience and Remote Sensing
SP  - 1
EP  - 15
VL  - 60
PB  - Institute of Electrical and Electronics Engineers
N2  - Fostered by the upcoming BIOMASS mission, this article explores long-term trends of P-band temporal decorrelation over a tropical forest due to a time series of 617 days acquired during the TropiScat-2 experiment. The interest in this unique time series is twofold. First, it provides consistent statistics to monitor the yearly evolution of temporal coherences according to specific time scales of the BIOMASS tomographic and interferometric phases. Second, it provides key insights to explore new processing approaches with the combination of data from different orbit directions (ascending/descending) and different mission cycles separated by about seven months according to the current acquisition plan. For the first time, this study shows that 18-day coherences (corresponding to the time interval between the first and last acquisitions of the BIOMASS tomographic processing) can vary significantly according to rainy and dry seasons (medians from 0.3 to 0.9). The extension to time intervals of up to 90 days within both seasons and over two consecutive years puts forward the key role of the typical sporadic rainfalls occurring during dry periods in tropical rainforests, with a stronger impact on temporal coherence evolution compared to the more reproducible rainy seasons. Furthermore, outstanding values significantly above zero have been obtained for the 7- and 14-month coherences (medians of 0.35 and 0.2, respectively), opening the way to new methods of change detection. Overall, this study highlights the role of P-band temporal decorrelation not only as a disturbance factor for coherent applications but also as a relevant indicator of forest changes.
UR  - http://dx.doi.org/10.1109/TGRS.2021.3082395
N1  - exported from refbase (http://php.ecofog.gf/refbase/show.php?record=1060), last updated on Thu, 21 Jul 2022 14:04:31 -0300
ID  - Essebtey_etal2021
ER  -