50) Which survey deals with the collection of the details of cyclonic affected area, flooded area etc, is done by aeroplane in air?

51) Which survey deals with the star's in the sky?

52) Which survey deals with the determination of natural & artificial features on the earth?

53) Which survey deals with the layout of plots, roads, watersupply and sewage system?

54) Which of the land survey deals with the plotting of additional details of boundary field and houses?