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Determine Air Base, Flight Altitude - Laboratory 6 | SURE 340, Lab Reports of Engineering

Material Type: Lab; Professor: Burtch; Class: Photogrammetry; Subject: Surveying Engineering; University: Ferris State University; Term: Spring 2008;

Typology: Lab Reports

2009/2010

Uploaded on 02/24/2010

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CENTER FOR PHOTOGRAMMETRIC TRAINING
FERRIS STATE UNIVERSITY
SURE 340 - Photogrammetry Spring 2008/09
Lab #6
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.
2. Measure the photo coordinates of the football field (100 yards)
and compute the ground coordinates using the parallax formulas
X = B
p x ; Y = B
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
B
B = AB
AB
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.
3. Note that the air base can be computed using the formula
pf2

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CENTER FOR PHOTOGRAMMETRIC TRAINING

FERRIS STATE UNIVERSITY

SURE 340 - Photogrammetry Spring 2008/

Lab

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.

  1. Measure the photo coordinates of the football field (100 yards) and compute the ground coordinates using the parallax formulas

X =

B

p

x ; Y =

B

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

B

B

= AB

AB

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.

  1. Note that the air base can be computed using the formula

B =

AB

x p

- x p

y p

y p

1 2 2

b b

a a

b b

a a

2 2 ⎛ ⎝

  1. Compute the flying height above the datum with the equation

a a

+h p

fB H=

  1. Using the parallax equations, find the elevation of the following points: a) NW corner of the 5th floor of the Swan Building b) East intersection of Swan Parking Lot and service drive on the east side of the Swan Building c) NE corner of the Student Rec Center d) NE corner of the parking lot north of the Student Rec Center

The parallax equation for height is given as:

a

A p

Bf h =H−

  1. Submit a standard report describing the procedures used to complete this assignment with comments on the results of this exercise. Are your results consistent with what you would expect of the area? As parallax differences between two points increases, would the elevation difference also increase? Explain.

SURE 340 – Photogrammetry Lab #6 Page 2