Plate 1

Plate 1 Finescale habitat map (13 classes) of east part of 
Caicos Bank based on a supervised classification of Landsat 
TM data subjected to water column correction and contextual 
editing. Such maps appear convincing. However, the overall 
accuracy of the map is only 31% and as such it is of little use 
as a basis for planning and management. An unsupervised 
classification of the same area, with classes assigned to 
habitats using extensive local knowledge, looked similarly 
plausible but had an overall accuracy of only 16%.