@InProceedings{DoblasCarShiSanAra:2020:AsRaIn,
author = "Doblas, Juan Prieto and Carneiro, Arian Ferreira and Shimabukuro,
Yosio Edemir and Sant'Anna, Sidnei Jo{\~a}o Siqueira and
Arag{\~a}o, Luiz Eduardo Oliveira e Cruz de",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Assessment of rainfall influence on sentinel-1 time series on
amazonian tropical forests aiming deforestation detection
improvement",
booktitle = "Proceedings...",
year = "2020",
pages = "397--402",
organization = "IEEE Latin American GRSS; ISPRS Remote Sensing Conference",
publisher = "IEEE",
keywords = "Sentinel-1, Time series, Change Detection, Rainfall Influence,
Forests, Amazon.",
abstract = "This work aims to determinate the relationship between C-band SAR
backscattering measurements over Amazonian tropical forests and
hourly precipitation rates, and to study the feasibility of a
SAR-anomaly masking method based on orbital rain measurements. To
do so, a comprehensive dataset of ESAs Sentinel-1 backscattering
data and the concomitant GPM-IMERG precipitation data was
collected and analysed. Backscattering anomalies were
characterized in a statistically meaningful way. GAM models were
then adjusted to the backscatter-rain data pairs. The computed
models show a positive correlation between non-anomalous
backscattering values and accumulated rain, of approximately 0,2
dB/mm·h-1 and 0,4 dB/mm·h-1 for VV and VH polarizations. Negative
anomalies, which can easily mislead deforestation algorithms, have
a strong negative correlation with rain rate observed at the time
of the SAR acquisition. This is especially true for VV
measurements. The subsequent anomaly masking procedure, based on
computed accumulated and hourly rain thresholding, yielded
unsatisfactory results. These poor results are probably due to the
coarse resolution of the 0.1° GPM-IMERG data, which is
insufficient to track anomaly-generating atmospheric events such
as storm rain cells. Rainrelated changes in SAR backscattering can
compromise deforestation detection algorithms, and further
research and sensor developing is needed to increase spatial
resolution of precipitation measures, to reach an optimal
backscattering anomaly screening.",
conference-location = "Santiago, Chile",
conference-year = "21-26 Mar.",
doi = "10.1109/LAGIRS48042.2020.9165637",
url = "http://dx.doi.org/10.1109/LAGIRS48042.2020.9165637",
isbn = "978-172814350-7",
language = "en",
targetfile = "doblas_assessment.pdf",
urlaccessdate = "24 abr. 2024"
}