Frozen Ground Map in Nunavik, Québec

This map has been created in the project "Variability and Change in the Canadian Cryosphere" . It is the result of the application of an algorithm developed by Catherine Lagacé during her M.Sc. studies at the INRS-ETE. In this algorithm, 3 variables are used : 1) 36,5 GHz Brightness Temper...

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Bibliographic Details
Main Authors: Bernier, Monique, Kalantari, Parvin, Gignac, Charles, Poulin, Jimmy
Format: Dataset
Language:English
Published: Canadian Cryospheric Information Network 2012
Subjects:
CRYSYS
Freeze-up
Ground ice
Image analysis
Remote sensing data
International Polar Year-Variability and change in the Canadian cryosphere - Canadian contribution to the state and fate of the polar cryosphere
Nunavik
International Polar Year
Online Access:https://dx.doi.org/10.5443/1261
https://www.polardata.ca/pdcsearch/?doi_id=1261
Description
Summary:This map has been created in the project "Variability and Change in the Canadian Cryosphere" . It is the result of the application of an algorithm developed by Catherine Lagacé during her M.Sc. studies at the INRS-ETE. In this algorithm, 3 variables are used : 1) 36,5 GHz Brightness Temperatures, 2) 18,7 GHz Brightness Temperatures, and 3) Water percentage by AMSR/E pixel. Once all these variables are gathered, they are used to calculate the Temperature Gradient of Weighted Vertical Polarisation (GTVP;Gradient de Température en polarisation Verticale Pondéré). GITV= [(Tb36.5GHzVert-a1)-(Tb18.7GHzVert-a1]/df where a1= water percentage by AMSR/E pixel. If GITV is negative, it means that the soil is frozen, in otherwise it is thawed or unfrozen . Reference: 1- Catherine Lagacé; Monographies ZZ1LAG22 2000, 2- Catherine Lagacé; Télédétection, 2002, vol 2, n °3, p. 161-175. : Purpose: This map is a representation of the Catherine Lagacé's algorithm results giving information about the state of the frozen ground. : Summary: Ces cartes ont été générées pour répondre au besoin du projet "Variability and Change in the Canadian Cryosphere". Elles représentent le résultat de l'application de l'algorithme de Catherine Lagacé, développé durant ses études de maîtrise à l'INRS-ETE, visant à identifier le moment de gel du sol. Dans cet algorithme, 3 variables sont utilisées : 1) La température de brillance à 36,5 GHz, 2) La température de brillance à 18,7 GHz, and 3) Pourcentage d'eau par pixel AMSR/E. Une fois ces variables regroupées, elles sont utilisées pour calculer le Gradient de Températures en polarisation Verticale Pondéré (GTVP). GITV= [(Tb36.5GHzVert-a1)-(Tb18.7GHzVert-a1]/df ;où a1= Pourcentage d'eau par pixel AMSR/E. Un GITV négative exprime un sol gelé sinon il est dégelé. Reference: 1-Catherine Lagacé; Monographies ZZ1LAG22 2000, 2- Catherine Lagacé; Télédétection, 2002, vol 2, n °3, p. 161-175.

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