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Two Years of High Resolution Snow Maps from Sentinel-2 and Landsat-8
1. Simon Gascoin1, Manuel Grizonnet2, Marine Bouchet2, Tristan
Klempka2, Germain Salgues3, Olivier Hagolle1,2
1CESBIO, 2CNES, 3Magellium
Toulouse, France
Two years of high resolution snow cover maps
in the Pyrenees from Sentinel-2 and Landsat-8
2. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
Ramsay 1998
3. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
Ramsay 1998
4. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
Dozier & Marks 1987
5. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
Landsat-5 (Jan 1985)
6. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
7. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
8. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
• 2000’s: MODIS
500 m, 1 day day 1
day 2
day 3
day 4
day 5
day 6
9. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
• 2000’s: MODIS
500 m, 1 day
Snow
Cloud
No snow
Gap-filling (cloud removal)
10. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
• 2000’s: MODIS
500 m, 1 day
13. Remote sensing of the snow cover area
• 1966 first snow map of
North Hemisphere (NOAA)
190 km, 7 days
• 1980’s: Landsat
30 m, 16 days (at best)
• 2000’s: MODIS
500 m, 1 day
• 2015: Sentinel-2
20 m, 5 days
day 1
day 6
day 11
14. Sentinel-2 TOA
Snow and
cloud masks
Atmospheric
and terrain
correction
Cloud and
cloud shadow
detection
Snow
detection
neigeaNDSI
MIRVIS
MIRVIS
NDSI
Þ>
+
-
=
Sentinel-2 and Landsat-8 snow processor
DEM
Code and doc: http://tully.ups-tlse.fr/grizonnet/let-it-snow
28. Combining Landsat-8 and Sentinel-2 snow maps
Number of snow days in 2015-2016
Sentinel-2 + Landsat-8 MODIS Aqua + Terra
29. Combining Landsat-8 and Sentinel-2 snow maps
Number of snow days in 2015-2016
Elevation band (m)
30. Conclusion
Data: http://theia.cnes.fr/Download free Sentinel-2 snow maps
Near real time production coming soon!
And more tiles in the Alps, Spain etc.
Documentation: http://www.cesbio.ups-
tlse.fr/multitemp/?page_id=10748
31. Les Deux Alpes: Summer ski area
Alpe d’Huez
Deux Alpes
SPOT-5 Take5 image time series
http://www.cesbio.ups-
tlse.fr/multitemp/?p=8676