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i am trying to calculate the area of vegetation in aerial image, i don't have the information regarding the height at which the image is taken. i have extracted vegetation in the image by using RGB values, the rest of the image i have set it to a pixel value 0(i.e black). how do i proceed from this step. please help. thank you

i am trying to calculate the area of vegetation in aerial image, i don't have the information regarding the height at which the image is taken. i have extracted vegetation in the image by using RGB values, the rest of the image i have set it to a pixel value 0(i.e black). how do i proceed from this step. please help. thank you