Surveying ii module iii class 3

Download Surveying ii module iii class 3

Post on 19-Jun-2015

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Engineering

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GCE Kannur

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  • 1. ModModule IIIule III AeAerialrial photogphotogrammetryrammetry

2. Ground co-ordinates for vertical photographs 3. 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 4. 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. 5. Image displacement on 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. 6. IMAGE DISPLACEMENT on vertical airphotos