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Material Type: Lab; Professor: Burtch; Class: Photogrammetry; Subject: Surveying Engineering; University: Ferris State University; Term: Spring 2008;
Typology: Lab Reports
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PURPOSE: The purpose of this lab is to have the students make a series of parallax measurements on a set of photographs to determine the air base (B), flight altitude (H) and the elevations of a series of points using the parallax equations.
GIVEN: f = 152.99mm B = 600 m (initial assumption) Elevation of the football field = 297.9m
PROCEDURE: 1. Orient the two photographs (8486-2-7 and 8486-2-8) using the stereoscope and establish the flight line axis system. Mark the flight line axis system on the photos and the corresponding y- axis perpendicular to the flight line.
p
x ; Y =
p
y
Compute the distance between the two points using the Pythagorean theorem. This distance should be 300'. If the computed distance is within 1' of being 300', the air base is that initial approximate value. Otherwise, compute a new air base using the relationship
new initial
true computed
With the new value for the air base, compute the ground coordinates and distance again. This process is repeated until the computed and true distances of the field agree to within 1' of each other.
x p
- x p
y p
y p
1 2 2
b b
a a
b b
a a
2 2 ⎛ ⎝
a a
+h p
fB H=
The parallax equation for height is given as:
a
A p
Bf h =H−
SURE 340 – Photogrammetry Lab #6 Page 2