Title

The 2005 Coral-Bleaching Event Roatan (Honduras): Use of Pseudoinvariant Features (PIFs) in Satellite Assessments

Document Type

Article

Publication Date

6-2008

Publication Title

Journal of Spatial Science

ISSN

1449-8596

Volume

53

Issue/No.

1

First Page

99

Last Page

112

Abstract

Radiometric normalisation is a necessary precursor to detecting coral‐bleaching from a time series of imagery. Using IKONOS and QuickBird, the pseudo‐invariant‐feature (PIF) approach was assessed, and found that small subsets and landbased PIFs lead to erroneous normalisation. In comparison, favourable results were achieved by using benthic sand and deep water subsets, coupled to a sun‐deglint process. Furthermore, it was found the more traditional strategy of ‘difference imaging’ to be compromised by slight spatial alignment errors between image sets. Our alternative approach, based on spectral radiance, ably discerned significant brightening of areas of seafloor populated by dense stands of Acropora, corroborating the occurrence of a documented bleaching event.

Additional Comments

NOAA award #: NA04NOS4260065

ORCID ID

0000-0002-6003-9324

ResearcherID

B-8552-2013; F-8807-2011

DOI

10.1080/14498596.2008.9635139

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Peer Reviewed

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