Coral and sand habitats were generally more accu-
rately distinguished than algal and seagrass habitats
(Table 3). At detailed scales of reef habitats, there was
considerable variability in accuracy among sensors
(Table 3).
How does satellite imagery compare
to aerial photography?
Satellite-based map accuracies were re-calculated for the
habitat classes mapped from 1:10,000 aerial photogra-
phy (Sheppard et al. 1995). The accuracies for satellite
sensors in Fig. 3 were higher than those in Fig. 2 be-
cause the re-calculation necessitated exclusion of several
rarer habitat categories (see Table 2) which, when
mapped, reduced overall accuracy. Inclusion of these
categories in Fig. 2 would have reduced accuracy for
two reasons. First, being fairly rare, the accuracy asso-
ciated with mapping these classes was disproportion-
ately low. Second, inclusion of these categories increased
the total number of habitat classes for intermediate and
®ne descriptive resolution and, in probabilistic terms,
reduced the chances of obtaining such high accuracies.
Coral and sand habitats were generally more accu-
rately distinguished than algal and seagrass habitats
(Table 3). At detailed scales of reef habitats, there was
considerable variability in accuracy among sensors
(Table 3).
How does satellite imagery compare
to aerial photography?
Satellite-based map accuracies were re-calculated for the
habitat classes mapped from 1:10,000 aerial photogra-
phy (Sheppard et al. 1995). The accuracies for satellite
sensors in Fig. 3 were higher than those in Fig. 2 be-
cause the re-calculation necessitated exclusion of several
rarer habitat categories (see Table 2) which, when
mapped, reduced overall accuracy. Inclusion of these
categories in Fig. 2 would have reduced accuracy for
two reasons. First, being fairly rare, the accuracy asso-
ciated with mapping these classes was disproportion-
ately low. Second, inclusion of these categories increased
the total number of habitat classes for intermediate and
®ne descriptive resolution and, in probabilistic terms,
reduced the chances of obtaining such high accuracies.
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