rugosity index for habitat complexity

Gregor Hodgson rcgregor at
Wed May 27 23:23:44 EDT 1998

Depending on the scale that you are interested in, another approach may
be useful. Attach a downloadable dive computer such as the Aladin Pro to
a stick and as you move along your transect line hold the stick so that
the computer follows the substrate relief. The relief map can then be
printed out and stored as a standard file. This is supposed to be
accurate to +/- 10 cm. You need to check the speed of the computer
logger --  the Aladin Pro is set to log at a 20 second interval and if
this is too slow, it might be possible to request the manufacturer to
reset it to a faster recording speed.
Gregor Hodgson, PhD
Institute for Environment and Sustainable Development
Hong Kong University of Science and Technology
Reef Check website:

More information about the Coral-list-old mailing list