A method for monthly mapping of wet and dry snow using Sentinel-1 and MODIS: Application to a Himalayan river basin

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dc.contributor.authorSnapir, Boris
dc.contributor.authorMomblanch, Andrea
dc.contributor.authorJain, Sanjay K.
dc.contributor.authorWaine, Toby
dc.contributor.authorHolman, Ian P.
dc.date.accessioned2018-10-24T14:29:18Z
dc.date.available2018-10-24T14:29:18Z
dc.date.issued2018-10-01
dc.description.abstractSatellite Remote Sensing, with both optical and SAR instruments, can provide distributed observations of snow cover over extended and inaccessible areas. Both instruments are complementary, but there have been limited attempts at combining their measurements. We describe a novel approach to produce monthly maps of dry and wet snow areas through application of data fusion techniques to MODIS fractional snow cover and Sentinel-1 wet snow mask, facilitated by Google Earth Engine. The method is demonstrated in a 55,000 km2 river basin in the Indian Himalayan region over a period of ∼2.5 years, although it can be applied to any areas of the world where Sentinel-1 data are routinely available. The typical underestimation of wet snow area by SAR is corrected using a digital elevation model to estimate the average melting altitude. We also present an empirical model to derive the fractional cover of wet snow from Sentinel-1. Finally, we demonstrate that Sentinel-1 effectively complements MODIS as it highlights a snowmelt phase which occurs with a decrease in snow depth but no/little decrease in snowpack area. Further developments are now needed to incorporate these high resolution observations of snow areas as inputs to hydrological models for better runoff analysis and improved management of water resources and flood risk.en_UK
dc.identifier.citationSnapir B, Momblanch A, Jain SK, et al., A method for monthly mapping of wet and dry snow using Sentinel-1 and MODIS: Application to a Himalayan river basin. International Journal of Applied Earth Observation and Geoinformation, Volume 74, February 2019, pp. 222-230en_UK
dc.identifier.cris19158964
dc.identifier.issn0303-2434
dc.identifier.urihttps://doi.org/10.1016/j.jag.2018.09.011
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13564
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectSnowen_UK
dc.subjectMODISen_UK
dc.subjectSentinel-1en_UK
dc.subjectGoogle Earth Engineen_UK
dc.subjectHimalayasen_UK
dc.titleA method for monthly mapping of wet and dry snow using Sentinel-1 and MODIS: Application to a Himalayan river basinen_UK
dc.typeArticleen_UK

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