Hi. I'm working on a project for my remote sensing class. I don't quite understand how to do these three problems: In the displacement method of height measurement from a single aerial photo we assume:

1. The principal point can be accepted as the nadir position. (the center of the frame is the center point directly below the camera) 2. The flight altitude above the base of the object can be precisely determined. 3. Both the top and base of the object are clearly visible. 4. The degree of image displacement must be great enough to be accurately measured with available equipment, e.g. an engineer's ruler. If all of these conditions are met, the equation for the displacement method is: h = d H / r where h is the height of the object, H is the altitude of aircraft, d is the length of the displaced object on the photo, and r is the radial distance from the photo nadir to the top of the object on the photo.

Question 1: On an aerial photograph, the distance from the nadir to the top of a displaced tree is measured as 4.00 inches. The tree itself is 340 feet above the ground. If the photograph was taken from a flying height of 4,500 feet, how long would you expect the displacement of the object on the photograph be? Your answer must include the units and two decimal places. Only the final answer is expected. Please do not include any intermediate steps/formulas/values as part of your answers.

Question 2: Assume a 1250-foot building appears 2.25 inches away from the nadir of a photograph (from the bottom of the building) and the displaced object is exactly 0.375 inches. From what height above the ground was the photograph taken? Your answer must include the units and two decimal places. Only the final answer is expected. Please do not include any intermediate steps/formulas/values as part of your answers.

Question 3: Assume an aerial photo was taken with a camera of 6 inches focal length, and has the scale of 1:6000. A building is measured on this photograph to have a photo displacement from top to bottom of 0.5 inches, and the radial distance from the photo nadir to the top of the displaced building is 3 inches. What would the building height be on the ground? Your answer must include the units and two decimal places. Only the final answer is expected. Please do not include any intermediate steps/formulas/values as part of your answers.

If someone could explain how to do these I'd really appreciate it!