12 
Purposes of the Study 
The purposes of the study reported herein were as follows: 
a. 
Develop methods using limited land-based surveying, aerial photography, 
and photogrammetric analysis to assess the long-term stability response 
of the concrete armor units on the Ofu Harbor breakwater. 
Conduct land surveys, armor unit inspections, aerial photography, and 
photogrammetric analyses to: 
(1) Test and improve developed methodologies and accurately define 
armor unit movement above the waterline. 
(2) Establish base conditions for the breakwater's armor units which 
can be revisited in the future under the Periodic Inspections work 
unit. 
Chapter 1 Introduction 
