Transcript
Page 1: Surveying ii module iii class 3

ModModule IIIule III

AeAerialrial

photogphotogrammetryrammetry

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Ground co-ordinates for vertical photographs

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If the ground coordinates of two points, A and B are given (XA, YA) and (XB, YB ), then the length L between the two points is given by

2 2

A B A BL X X Y Y

where

The flying height H can be calculated from these values

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DISTORTION AND DISPLACEMENT

distortion in aerial photography is defined as any shift in the position of an image on a photograph that alters the perspective characteristics of the image

displacement is any shift in the position of an image on a photograph that does not alter the perspective characteristics of the photograph.

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Image displacementon vertical airphotos

• Relief displacement The displacement of the point a on the

photograph from its true position, due to height, is called the height or relief displacement or relief distortion (RD).

This distortion is due to the perspective geometry.

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IMAGE DISPLACEMENT on vertical airphotos

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