PET 16 [ 10 Tjk IjkaJk

where,

1.514

ijk'5) Jan

j = Pixel value of i th row k = Pixel value of j th column ajk =67.5*10-8(Ijk)3-7.71*10-5*(Ijk)2+0.01792( Ijk)+0.4923

These monthly potential evapotranspiration were summed over twelve months in a year to obtain spatial distribution of annual PET for use in computation of moisture index (MI). The moisture index with positive and negative values indicates moist or dry climate and seasonal variation of effective moisture. The revised moisture index of Thornwaite and Mather (1955) method based on annual rainfall and potential evapotranspiration was calculated as,

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