Adaptation of the SNOWMAP algorithm for snow mapping over eastern Canada using Landsat-TM imagery

Abstract The snow mapping algorithm SNOWMAP was adapted to Landsat-TM data and to the context of eastern Canada. Six Landsat-5 TM scenes were used. It was found that the original version of SNOWMAP greatly underestimates snow cover extent. The modification made to the original algorithm, by cancelling the minimum threshold of 0.1 on the NDVI value, allows gaps to be filled in. In addition, a spatial correction procedure applied to the modified SNOWMAP algorithm results improves snow detection under coniferous forests. Based on a limited data set of ground-based observations (only 40 sites were available), the modified SNOWMAP seems to perform better in snow detection than the original version of the algorithm. An application case is presented in order to demonstrate the relevance of the modified SNOWMAP results as a high spatial-resolution reference for the validation of historical snow maps derived from medium spatial-resolution satellite data. Citation Chokmani, K., Dever, K., Bernier, M., Gauthier, Y. & Paquet, L.-M. (2010) Adaptation of the SNOWMAP algorithm for snow mapping over eastern Canada using Landsat-TM imagery. Hydrol. Sci. J. 55(4), 649–660.

[1]  A. Klein,et al.  Improving snow cover mapping in forests through the use of a canopy reflectance model , 1998 .

[2]  René Laprise,et al.  A Semi-Implicit Semi-Lagrangian Regional Climate Model: The Canadian RCM , 1999 .

[3]  Alexandre Langlois,et al.  Étude de la variation spatio-temporelle du couvert nival par télédétection micro-ondes passives et validation du Modèle Régional Canadien du Climat (MRCC) , 2003 .

[4]  Karem Chokmani,et al.  VALIDATION OF A METHOD FOR SNOW COVER EXTENT MONITORING OVER QUEBEC (CANADA) USING NOAA-AVHRR DATA , 2005 .

[5]  Ronald J. Hall,et al.  Operational mapping of the land cover of the forested area of Canada with Landsat data: EOSD land cover program , 2003 .

[6]  N. DiGirolamo,et al.  MODIS snow-cover products , 2002 .

[7]  Alain Royer,et al.  Snow Mapping over Eastern Canada for Climate Change Studies Purpose using Historical NOAAAVHRR and SSM/I Data , 2006, 2006 IEEE International Symposium on Geoscience and Remote Sensing.

[8]  J. Dozier.  Spectral Signature of Alpine Snow Cover from the Landsat Thematic Mapper , 1989 .

[9]  Russell G. Congalton,et al.  Assessing the accuracy of remotely sensed data : principles and practices , 1998 .

[10]  Rune Solberg,et al.  Subpixel mapping of snow cover in forests by optical remote sensing , 2003 .

[11]  Monique Bernier,et al.  Suivi spatio-temporel du couvert nival du Québec à l’aide des données NOAA-AVHRR , 2006 .

[12]  Dorothy K. Hall,et al.  Improving the MODIS global snow-mapping algorithm , 1997, IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development.

[13]  Jeff Dozier,et al.  Automated Mapping of Montane Snow Cover at Subpixel Resolution from the Landsat Thematic Mapper , 1996 .

[14]  D. Hall,et al.  Development of methods for mapping global snow cover using moderate resolution imaging spectroradiometer data , 1995 .

[15]  Yuichi Shimamura,et al.  Evaluation of a useful method to identify snow‐covered areas under vegetation – comparisons among a newly proposed snow index, normalized difference snow index, and visible reflectance , 2006 .

[16]  Dorothy K. Hall,et al.  Snow Mapping with the MODIS Aqua Instrument , 2004 .

[17]  Alexandre Langlois,et al.  Evaluation of the snow cover variation in the Canadian Regional Climate Model over eastern Canada using passive microwave satellite data , 2004 .