Figure 19. Typical target established on an armor unit 



with the geometric qualities of a map. Precise horizontal measurements may be 

 obtained from the orthophotos using an engineer scale since the image has been 

 rectified and is free from skewness and distortion. 



Full-scale hard copies of aerial photographs, photogrammetric maps, and 

 orthophotos are on file at the authors' offices at WES and the Philadelphia 

 District. In addition, all photogrammetric compilations and analyses and map 

 data have been stored on diskettes in AutoCad files for future use. In summary, 

 very detailed and accurate information relative to the armor unit positions at the 

 Manasquan Inlet jetties have been captured by means of aerial photography and 

 photogrammetric analysis. Data are stored on diskettes and can be retrieved and 

 compared against data obtained during subsequent monitoring. Thus, armor unit 

 movement data may continue to be quantified precisely in future years. 



Broken Armor Unit Survey 



On 17 November 1998, a survey of broken/cracked dolos armor units above 

 the waterline on the Manasquan Inlet jetties was conducted. During the inspec- 

 tion, each broken armor unit was identified and photographed, and its approxi- 

 mate location relative to breakwater sta and offset from the concrete jetty cap 

 was recorded. In addition, the dolosse number and date of casting, if visible, as 

 well as the type of break were recorded. Types of breaks included shank and 



Chapter 3 Current Monitoring Plan and Data Comparison 



31 



