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in this video we will calculate topographic witness index in rgis from digital elevation model so first our digital elevation model should be in any projected system and then we will fill it first and then we will go further so go to our toolbox a special analysis tool hydrology and then fill get this dim and save it I am writing a field dot Tiff and then click ok so we will now use this field as dim now for calculating Twi we need tan of slope and that slope should be in Radian not in percent not in degree it should be in Radian then we have to calculate a slope in Radian and then a derivative of flow accumulation so we have to calculate for flow accumulation and slope in radian then we will calculate topography witness index so for first we will get the flow accumulation for getting flow accumulation we have to have flow Direction first so that flow direction is in same tool hydrology flow Direction get this input and then Iamp;#39;m writing flow Direction FD dot if so this is our f