 SPOT XS image_RGB at Blue_Lagoon One-band case: deeper than 4-6 m, dark bottomed areas are mapped with depths in great excess:SPOT XS, image_Z in grey-shades at Blue_Lagoon this explains the apparent "moat" around the coral growths. |
  Casi flights #2 & 4 false color composites |
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Please notice numerous -and ominous- cloud shadows, and also skyglint -or is it cloudglint, at the far right? Deglinting quite efficient though: see below. |
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  Casi flights #2 & 4 image_B Please refer to Rangiroa_ETM: this dark-bottomed area is present also in the ETM image A difficult case, interpretation is questionable. It is reassuring to see bright bottomss reappearing at depth inside the main lagoon in Flight #4! |
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 Flight #2: a close-up view of the shadowed/glinted area These shadows/glint, combined with complex bottom topography/history, make for a challenging interpretation! |
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Casi flights #2 & 4 Color composite of normalized bottom reflectance, 490-557-645 nm
 Flight #2: false color composite, histeq enhancement |  Flight #2: image_BThe "sandy plain" at depth is mapped in excess of 30 m at the base of the outer reef slope |
 Flight #2: image_ZLocal "spurr and groove" morphology appears to be the result of erosion of the reef outer slope: this cause the reef rim to move back by approx 20 m Many coral growths grace most of theBlue_Lagoon floor, except inside the three basins |  Flight #2: normalized bottom reflectance |
3D views of Blue_Lagoon flight #2
(processed in 1999)
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