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Publication . Other literature type . Report . 2018

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;
Open Access
English
Published: 12 Sep 2018
Publisher: Zenodo
Abstract
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.
Subjects

snow, remote sensing

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ZENODO
Other literature type . 2018
Providers: ZENODO
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