WIX Archives
Sonar Shadows
Posted by AndyG on Tue Apr 20, 2004 04:33:15 PM
In reply top None of them are fabric covered! posted by bdk on Tue Apr 20, 2004 03:55:44 PM
Bugger metal covered!!!
Thats that particular facet of my argument shot down then, though maybe not for the Sunderland as I think they should show up differently.
Notice that the sidescan sonar shadows in the genuine PBY4 images have quite a distinctive dispersion as if the image was 'illuminated' from quite an oblique angle. The P47/Sunderland Photoshop renderings appear to be 'illuminated' from above and don't have the same long shadows.
"The image is thus built up one line of data at a time. Hard objects reflect more energy causing a lighter signal on the image, soft objects that do not reflect energy as well show up as darker signals. The absence of sound such as shadows behind objects show up as very dark areas on a sonar image."
