2017 Amazonia Deforestation
Sampled area
Timeseries of vegetation change
Vegetation level change (Running averaged)
Optical image in 2016 (Before deforestation)
Optical image in 2016 (After deforestation)
The Deforestation Proxy Maps were derived from SAR interferometric coherence. Here, the interferometric coherence is defined as "vegetation level". Lower coherence results in higher vegetation levels due to the dense canopy of rainforests, while higher coherence might refer to bare land (ranches), villages or other crops that have thinner canopy.
From the maps and the time-series figure (sampled from the red rectangle area), it can be inferred that the surface was changing dynamically. The followings are some preliminary assumptions from the sampling area (red rectangle):
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1. The land was originally rainforest from February to April.
2. The degree of vegetation loss peaked from May to August. It might be due to logging so that more land was exposed (Higher coherence, lower vegetation level).
3. Following from August to December, the land was made into other crop fields yet the canopy was not as dense as the original rainforest.
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Optical satellite images from Google Earth are simple validations of such deforestation patterns.
SAR images: Sentinel-1A,B (55 images)
Interferometric pairs: 54 pairs
Date: 20170202~20171229