Marine & Environmental Sciences Faculty Articles
Multi-Site Evaluation of IKONOS Data for Classification of Tropical Coral Reef Environments
ORCID
0000-0002-6003-9324
ResearcherID
F-8807-2011
Document Type
Article
Publication Title
Remote Sensing of Environment
ISSN
0034-4257
Publication Date
11-2003
Keywords
Landsat, Bathymetric correction, Glint, Accuracy, Habitat mapping, Seagrass
Abstract
Ten IKONOS images of different coral reef sites distributed around the world were processed to assess the potential of 4-m resolution multispectral data for coral reef habitat mapping. Complexity of reef environments, established by field observation, ranged from 3 to 15 classes of benthic habitats containing various combinations of sediments, carbonate pavement, seagrass, algae, and corals in different geomorphologic zones (forereef, lagoon, patch reef, reef flats). Processing included corrections for sea surface roughness and bathymetry, unsupervised or supervised classification, and accuracy assessment based on ground-truth data. IKONOS classification results were compared with classified Landsat 7 imagery for simple to moderate complexity of reef habitats (5–11 classes). For both sensors, overall accuracies of the classifications show a general linear trend of decreasing accuracy with increasing habitat complexity. The IKONOS sensor performed better, with a 15–20% improvement in accuracy compared to Landsat. For IKONOS, overall accuracy was 77% for 4–5 classes, 71% for 7–8 classes, 65% in 9–11 classes, and 53% for more than 13 classes. The Landsat classification accuracy was systematically lower, with an average of 56% for 5–10 classes. Within this general trend, inter-site comparisons and specificities demonstrate the benefits of different approaches. Pre-segmentation of the different geomorphologic zones and depth correction provided different advantages in different environments. Our results help guide scientists and managers in applying IKONOS-class data for coral reef mapping applications.
DOI
10.1016/j.rse.2003.04.005
Volume
88
Issue
1-2
First Page
128
Last Page
143
Additional Comments
NASA grant #s: NAG5-10908, NAG-3446
NSUWorks Citation
Serge Andrefouet, Philip Kramer, Damaris Torres-Pulliza, Karen E. Joyce, Eric J. Hochberg, Rodrigo Garza-Perez, Peter J. Mumby, Bernhard Riegl, Hiroya Yamano, William H. White, Mayalen Zubia, John C. Brock, Stuart R. Phinn, Abdulla Naseer, Bruce G. Hatcher, and Frank E. Muller-Karger. 2003. Multi-Site Evaluation of IKONOS Data for Classification of Tropical Coral Reef Environments .Remote Sensing of Environment , (1-2) : 128 -143. https://nsuworks.nova.edu/occ_facarticles/288.
Comments
©2003 Elsevier Inc. All rights reserved.