Reef
Sand
(c)
(a)
(e)
Sha llow
reef
Deep water
(d)
(b)
(f)
Fig. 4.4 Examples of airborne hyperspectral data of reefs: a, c CASI image of reefs at St. John,
U.S Virgin Islands before and after deglint procedure (reproduced with permission from Hedley
et al. 2005), red green and blue are 508, 488, 467 nm, respectively; and (e) CASI image of Heron
Reef, Australia, red, green and blue are 523, 508, 470 nm, respectively. Each plotted type depicts
five reflectance spectra from adjacent pixels. Note that deglint decreases the spread of the data but
does not necessarily increase the spectral separation between differing types (b, d). f Example
where reef and deep water have similar reflectance profiles but are separable up to 600 nm
despite sources of variation
4 Hyperspectral Applications
93
Sand
(c)
(a)
(e)
Sha llow
reef
Deep water
(d)
(b)
(f)
Fig. 4.4 Examples of airborne hyperspectral data of reefs: a, c CASI image of reefs at St. John,
U.S Virgin Islands before and after deglint procedure (reproduced with permission from Hedley
et al. 2005), red green and blue are 508, 488, 467 nm, respectively; and (e) CASI image of Heron
Reef, Australia, red, green and blue are 523, 508, 470 nm, respectively. Each plotted type depicts
five reflectance spectra from adjacent pixels. Note that deglint decreases the spread of the data but
does not necessarily increase the spectral separation between differing types (b, d). f Example
where reef and deep water have similar reflectance profiles but are separable up to 600 nm
despite sources of variation
4 Hyperspectral Applications
93