Cladophora is a filamentous, green algae that grows in all five
Laurentian Great Lakes. Although native, clear water created by zebra
mussels and high levels of phosphorous have allowed it to become
overgrown and cause local environmental problems. As the algae sloughs off and is carried to shore, there have been outbreaks of avian
botulism as well as reports of beach
fouling. Because of
it's harmful effects, determining the extent of
Cladophora is
useful for water quality managers as well as utility operators and
recreational beach-goers.

In 2011, Michigan Tech Research Institute
developed a technique to use satellite imagery to track the extent of
Cladophora. Using an algorithm based on the the work of Lyzenga (Lyzenga 1978, 1981, Lyzenga et al. 2006), they depth-corrected Landsat data to map
Cladophora at a test site - Sleeping Bear Dunes National Lakeshore - and achieved 85% accuracy (see right). You can
view a *.pdf of the test site results or read more about the process they used
here.
The algorithm was subsequently applied to the coast of Lake Michigan and charted the location of
Cladophora to a depth of ~20 meters. An interactive map of the result can be seen
here.
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