By using this data, underwater features can be detected and properly 

 identified on examination of imagery. Magoon, Berg, and Hallermeier 

 (1973) pointed out the utility of examining all four MSS bands, simulta- 

 neously and individually, and in conjunction with other existing data. 



IV. IMAGERY AVAILABLE FOR STUDY 



Table 3 presents imagery identification, dates, and times of obten- 

 tion for both ERTS-1 and underf light coverage. 



Table 3. 



Dates and times of ERTS and 

 underf light observations. 



Frame 

 number 



Date 



Time (e.s.t.) 

 (hours) 



ERTS-1 



E-1007-15142 



30 July 1972 



1014 



E-1080-15203 



11 October 1972 



1021 



E-1115-15152 



15 November 1972 



1015 



E-1134-15211 



4 December 1972 



1021 



E-1170-15205 



9 January 1973 



1021 



E-1188-15210 



27 January 1973 



1021 



E-1205-15153 



13 February 1973 



1016 



E-1242-15213 



22 March 1973 



1022 



E-1314-15210 



2 June 1973 



1021 



Underf lights 



Flight 





Date 



Time (e.s.t.) 



number 







(approximate) 

 (hours) 



72-116 



19 



July 1972 



0842 



72-144 



19 



August 1972 



1044 



72-167 



22 



September 1972 



1226 



W-179-FLT1 



2 



November 1972 



1025 



73-013A 



30 



January 1973 



0945 



W-187-FLT1 



13 



February 1973 



1025 



73-062 



28 



April 1973 



1200 



W-195 



11 



May 1973 



1140 



W-222 



15 



June 1973 



1220 



V. GENERAL COMMENTS CONCERNING IMAGERY 



The basic observations made and conclusions reached are referenced to 

 the images in Table 3. However, the broad range of conditions encountered 

 are representative of ERTS-1 imagery in general, and the statements have 

 applicability to other studies and investigations using this imagery. 



Nominal resolving power of the multispectral scanner is approximately 

 250 feet on the ground (National Aeronautics and Space Administration, 1971) 



