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! Introduction 2 Normalized difference vegetation index 3 The AVHRR sensors 4 Data processing Flow 6 Scene selection 5 Computation of solar illumination and satellite viewing geometry5 Radiometric calibration 7 Geometric registration 8 Computation of the normalized difference vegetation index9 Maximum value compositing 9 Product generation 11 Methods 11 Acquisition dates 11 Satellite scan angle 12 Solar zenith angle 12 Cloud cover 12 Geographic registration 14 Results 15 Distribution of acquisition dates 15 1991 15 1992 18 1993 18 1994 21 1995 26 1996 26 1997  Satellite scan angle distribution31 1991 34 1992 34 1993 34 1994 42 1995 42 1996 42 1997 42 Solar zenith angle 45 Cloud cover 68 Geometric registration errors 68 Discussion 72 Conclusion 83 References 84

Characteristics of the Alaskan 1-Km Advanced Very High Resolution Radiometer data sets used for analysis of vegetation biophysical properties