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winter surface reflectance in popar regions


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Hello, I have MODIS surface reflectance 250m imagery for Scandinavia for one year and I need to extract surface reflectance values for specific points (lakes) and determine the date of freeze and break up of ice. Most of the lakes however freeze in November when large parts of the imagery is affected by polar darkness. It still contains the information but the values are of course many times lover than in daylight conditions. I was wondering if anybody would know any correction method that could be applied to calibrate the values. 

 

Thank you

Tereza

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