CONCLUSIONS 



As expected, the most important factors affecting resolution of bottom 

 features are submergence depth and image scale on the original film. Small- 

 sized bars or low contrast features (or both) disappeared quickly with 

 submergence. As long as the film and filters recorded adequate energy in 

 the 410- to 600-millimeter wavelength region, water depth penetration was 

 not seriously affected. Resolution of bottom features was relatively 

 independent of sun angle and exposure as long as sunglint was avoided and 

 exposure was within plus or minus one stop of optimum. Use of a polarizing 

 filter did not improve target resolution. 



VII-17 



