Preprints
https://doi.org/10.5194/tc-2021-172
https://doi.org/10.5194/tc-2021-172

  17 Jun 2021

17 Jun 2021

Review status: this preprint is currently under review for the journal TC.

Brief communication: Evaluation of the snow cover detection in the Copernicus High Resolution Snow & Ice Monitoring Service

Zacharie Barrou Dumont1, Simon Gascoin1, Olivier Hagolle1, Michaël Ablain2, Rémi Jugier2, Germain Salgues2, Florence Marti2, Aurore Dupuis3, Marie Dumont4, and Samuel Morin4 Zacharie Barrou Dumont et al.
  • 1CESBIO, Université de Toulouse, CNRS/CNES/IRD/INRAE/UPS, Toulouse, France
  • 2Magellium, Ramonville St Agne, France
  • 3CNES, Toulouse, France
  • 4Univ. Grenoble Alpes, Université de Toulouse, Météo-France, CNRS, CNRM, Centre d’Études de la Neige, Grenoble, France

Abstract. The High Resolution Snow & Ice Monitoring Service was launched in 2020 to provide near real time, pan-European snow and ice information at 20 m resolution from Sentinel-2 observations. Here we present an evaluation of the snow detection using a database of snow depth observations from 1764 stations across Europe over the hydrological year 2016–2017. We find a good agreement between both datasets with an accuracy of 94 % (proportion of correct classifications) and kappa of 0.80. More accurate (+6 % kappa) retrievals are obtained by excluding low quality pixels at the cost of a reduced coverage (−13 % data).

Zacharie Barrou Dumont et al.

Status: open (until 18 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2021-172', Anonymous Referee #1, 08 Jul 2021 reply
  • RC2: 'Review comment on tc-2021-172', Anonymous Referee #2, 13 Jul 2021 reply

Zacharie Barrou Dumont et al.

Zacharie Barrou Dumont et al.

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Short summary
Since 2020, the Copernicus High Resolution Snow & Ice Monitoring Service distributes snow cover maps at 20 m resolution over Europe in near real time. These products are derived from the Sentinel-2 Earth observation mission, with a revisit time of 5 days or less (cloud-permitting). Here we show the good accuracy of the snow detection over a wide range of regions in Europe, except in dense forest regions where the snow cover is hidden by the trees.