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![](https://webarchive.library.unt.edu/eot2008/20090109054645im_/http://coastal.er.usgs.gov/images/tabs/dot_clear.gif) |
Virtual Field Trip - Longboat and Lido Keys
Separated from Anna Maria Island to the north by Longboat Pass, Longboat Key is a ten mile long
barrier island. To the south, Lido Key was formed artificially in the 1920's when a series of small
mangrove islands were filled with dredge material from New Pass.
A portion of this area was surveyed using a highly detailed sidescan-sonar mosaic.
A sonar unit was towed behind a boat, creating a mosaic by overlapping transect lines. The completed survey
was used to create an interpretive map of the seafloor surface.
Below: Oblique aerial photograph of Longboat Key, looking west out over the Gulf of Mexico. |
![](https://webarchive.library.unt.edu/eot2008/20090109054645im_/http://coastal.er.usgs.gov/images/tabs/dot_clear.gif) |
![Longboat Key](siestakey.jpg) |
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![Lido Key](caseykey.jpg) |
Above: Oblique aerial photograph of Lido Key, looking northeast. |
![](https://webarchive.library.unt.edu/eot2008/20090109054645im_/http://coastal.er.usgs.gov/images/tabs/dot_clear.gif) |