Sentinel-1

Orpaillage sur le fleuve frontalier entre la Guyane et le Suriname : télédétection des dommages causés par les barges aux rives du Maroni

Le Suriname, comme l’ensemble du plateau des Guyanes, est touché depuis plus de trente ans par le fléau de l’orpaillage qui entraîne la destruction du couvert forestier, la pollution des cours d’eau, en impactant fortement l’environnement et les population locales. L’orpaillage y est dit primaire quand l’or est directement extrait de la roche-mère, alors qu’il […]

09.09.2020

Benefits of SAR for forest loss alert detection in the tropics

The tropical forest is an important carbon sink which also hosts high biodiversity. Monitoring forest loss is therefore a major issue which requires efficient and accurate tools. In fact, the major challenge is to detect forest loss as precisely and quickly as possible, despite cloud cover which limits the availability of usable optical satellite imagery. […]

05.06.2020

My remote sensing analyses on Twitter. Part 2: landslides

I started to look at landslides in satellite images when I saw this tweet by @RemotePixel: July 11th 2016 Sentinel-2 Image over Glacier Bay, AK massive landslide! pic.twitter.com/pTnHQ7el8G — Remote Pixel (@RemotePixel) July 14, 2016 Like floods, landslides can be quickly identified using a before/after image comparison. In the case of the Glacier Bay landslide […]

20.01.2020

My remote sensing analyses on Twitter. Part 1: floods

S. P. Hicks (@seismo_steve) wrote for Nature Geoscience a nice piece « Geoscience analysis on Twitter » where he shares his experience on using Twitter for the real time analysis of geohazards. Actively using Twitter for science may be perceived by some as a significant time-sink — the demands on individual researchers and their institutions at times […]

13.01.2020

Sentinel-2 also sees grassland taxonomic diversity !

Sentinel-2 image time series are widely used to map land cover, see for instance here or here. However, they can be used to extract other relevant information about the observed landscapes. In a recently published article (https://doi.org/10.1016/j.rse.2019.111536), we have used fifteen months of Sentinel optical and radar data to predict taxonomic and functional diversity at […]

20.12.2019

The flow of Pine Island Glacier in Antarctica as seen by Sentinel-1

The clip below shows the evolution of Pine Island glacier ice tongue in West Antarctica, from June 2017 to October 2019. I made it with 111 quicklooks of Sentinel-1 radar images processed by the Alaska Satellite Facility and available via the vertex data portal. All images were acquired in interferometric wide swath mode (polarization HH, […]

05.11.2019

India water crisis: Sentinel-1 detects surface water, ForEarth app restitutes and shares water stresses

In the framework of an open call Science4society funded by ESA, researchers at CESBIO have implemented a surface water detection algorithm from radar data Sentinel-1 on a cloud computing system. An API developed by Geomatys and JeoBrowser, two Information Technologies companies in France, is used to send the resulting surface water masks to a smartphone […]

17.09.2019

Les Sentinels capturent les pierres ponces flottant dans l’océan Pacifique

L’éruption d’un volcan sous-marin dans l’océan Pacifique a provoqué la formation de curieux îlots de pierres ponces au large des Tonga. Ces roches volcaniques très poreuses ont une densité inférieure à celle de l’eau de mer ce qui leur permet de flotter à la surface de l’océan. Ces « radeaux de pierres ponces » (pumice rafts) sont […]

26.08.2019

Near real time detection of deforestation in French Guiana

Marie Ballère started in October 2018 a Ph.D. funded by WWF and CNES. The aim of her Ph.D. is to characterize animal habitats in tropical forest using radar and optical data. The first results on near real time forest disturbances assessment using radar Sentinel-1 data in French Guiana were shown at the ESA Living Planet […]

21.05.2019

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