Marine & Environmental Sciences Faculty Articles
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.
NSUWorks Citation
Gwilym Rowlands, Samuel J. Purkis, and Bernhard Riegl. 2008. The 2005 Coral-Bleaching Event Roatan (Honduras): Use of Pseudoinvariant Features (PIFs) in Satellite Assessments .Journal of Spatial Science , (1) : 99 -112. https://nsuworks.nova.edu/occ_facarticles/241.
ORCID ID
0000-0002-6003-9324
ResearcherID
B-8552-2013; F-8807-2011
DOI
10.1080/14498596.2008.9635139
Additional Comments
NOAA award #: NA04NOS4260065