chernobyl revisited - changes 23 years after the chernobyl nuclear disaster

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Chernobyl Revisited Changes 23 years after the Chernobyl Nuclear Disaster Shu Tao Yale School of Forestry & Environmental Studies

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Page 1: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Chernobyl Revisited Changes 23 years after 

the Chernobyl Nuclear DisasterShu Tao

Yale School of Forestry & Environmental Studies

Page 2: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Chernobyl exclusion zone(original and present day)

Chernobyl Nuclear Power Plant

Forest

Pripyat

Page 3: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Images : Landsat 5

1986/04/29

Page 4: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Subset

Page 5: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Cloud MaskBand Math: Reflectance >0.19, Brightness temperature <282

1985/04/26 1986/04/29 2009/04/29

Page 6: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

1985/04/26 RGB-321 1986/04/29 RGB-321

1985/04/26Before the Disaster

1986/04/293 Days Post Disaster

Brightness Temperature

Cooling Pond

NuclearPower Plant

Page 7: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

NDVI1986/04/29 2009/04/29

Page 8: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

NDVI ChangeRed   –   1986Green – 2009

• Mean NDVI• 1986 0.196473• 2009 0.212662

Page 9: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster
Page 10: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Supervised Classification

Maximum Likelihood (Supervised & Cleaned)

1986/04/29 2009/04/29

Page 11: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Class Change Statistics

Constructions -> 55%-> WetlandsBright vegetation -> 72% -> Bare Soil

Page 12: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster
Page 13: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Class Change - ConiferousRed   –   1986Green – 2009

Cooling Pond

Nuclear Power Plant Pripyat

Page 14: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Conclusions

• 1) Landsat5 helped to confirm the Chernobyl Nuclear Disaster

• 2) Urban area keeps strikingly similar

• 3) Forest area is generally expanding but with

deforestation in some area

Page 15: Chernobyl Revisited - Changes 23 years after  the Chernobyl Nuclear Disaster

Thanks!

Questions?