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Algorithm theoretical basis documentation for an operational snow cover product from Sentinel-2 and Landsat-8 data (Let-it-snow)

Gascoin Simon; Grizonnet Manuel; Klempka Tristan; Salgues Germain


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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Gascoin Simon</dc:creator>
  <dc:creator>Grizonnet Manuel</dc:creator>
  <dc:creator>Klempka Tristan</dc:creator>
  <dc:creator>Salgues Germain</dc:creator>
  <dc:date>2018-09-12</dc:date>
  <dc:description>This document describes the algorithm of the Let-it-snow (LIS) processing chain to generate the snow cover extent product for the Theia land data center. The algorithm takes as input a Sentinel-2 or Landsat-8 image of surface reflectance corrected from atmospheric and slope effects, the associated cloud mask (level 2A product provided by Theia) and a digital elevation model. The output is a single band raster at the same resolution of the input image giving the snow presence or absence and a cloud mask. The output cloud mask is different from the input cloud mask because some pixels can be reclassified as snow or no-snow by the algorithm.

The snow detection algorithm works in two passes: first the most evident snow cover is detected using a set of conservative thresholds, then these snow pixels are used to determine the lowest elevation of the snow cover. A second pass is performed for the pixels above this elevation with a new set of less conservative thresholds.

The processing chain also generates a vectorized version of the snow mask after pass 1 and 2 and a color composite that is overlaid by these polygons. These secondary products are intended for expert validation purpose.</dc:description>
  <dc:identifier>https://zenodo.org/record/1414452</dc:identifier>
  <dc:identifier>10.5281/zenodo.1414452</dc:identifier>
  <dc:identifier>oai:zenodo.org:1414452</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>doi:10.5281/zenodo.1414451</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://opensource.org/licenses/AGPL-3.0</dc:rights>
  <dc:subject>snow</dc:subject>
  <dc:subject>remote sensing</dc:subject>
  <dc:title>Algorithm theoretical basis documentation for an operational snow cover product from Sentinel-2 and Landsat-8 data (Let-it-snow)</dc:title>
  <dc:type>info:eu-repo/semantics/technicalDocumentation</dc:type>
  <dc:type>publication-softwaredocumentation</dc:type>
</oai_dc:dc>
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