The flying height of the camera is 1,000 m above mean ground level, the distance of the top of a building from a nadir point is 10 cm and the relief displacement of building is 7.2 mm. The height of the building, is

H =(d/D)*zp
H= (7.2/10)mm/cm *1000 m
=72m

d =rh/H
7.2mm=100mm x h mm/ 1000000mm
h =72000mm
h= 72 m

Relief displacement (d)=rh/H
Given- d=7.2mm ,r=10 cm =100mm, H=1000m=1000000mm
7.2=100xh/1000000
h=72000mm
h=72 m

ab=(h/H)*va
h=(ab/va)*H
h=(.72/10)*100000
h=7200cm
h=72m