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Aerial surveying system

  • US 4,727,374 A
  • Filed: 01/11/1982
  • Issued: 02/23/1988
  • Est. Priority Date: 01/15/1979
  • Status: Expired due to Fees
First Claim
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1. A method of aerial surveying to determine ground contours comprising, in combination, the steps of:

  • (a) collecting data by(i) positioning a radar unit at a known point on the ground;

    (ii) defining an imaginary reference plane with respect to said radar unit;

    (iii) establishing a survey track for an aircraft along the ground and continuously moving said aircraft along said track, said aircraft including an altimeter for measuring the height of of said aircraft above the ground;

    (iv) simultaneously, continuouslydetermining the position of the aircraft at selected times T1, T2, T3 . . . Tn as said aircraft continuously moves along said survey track,utilizing said radar unit to measure the range and elevation of said aircraft with respect to said radar unit at said selected times T1, T2, T3 . . . Tn as said aircraft continuously moves along said track, andutilizing said altimeter to determine the height of said aircraft at said selected times T1, T2, T3 . . . Tn , and(v) correlating the range, elevation, position and height of said aircraft above the ground at each of said selected instants in time T1, T2, T3 . . . Tn to determine the distance from said reference plane to the ground for the location of said aircraft at each of said instants in time; and

    (b) developing ground contours from the reference plane to ground distances calculated in step (v).

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