Bathymetry,water optical properties,and benthic classification of coral reefs using hyperspectral remote sensing imagery |
| |
Authors: | M P Lesser C D Mobley |
| |
Institution: | (1) Department of Zoology and Center for Marine Biology, University of New Hampshire, Durham, NH 03824, USA;(2) Sequoia Scientific, Inc, 2700 Richards Road, Suite 107, Bellevue, WA 98005, USA |
| |
Abstract: | The complexity and heterogeneity of shallow coastal waters over small spatial scales provides a challenging environment for
mapping and monitoring benthic habitats using remote sensing imagery. Additionally, changes in coral reef community structure
are occurring on unprecedented temporal scales that require large-scale synoptic coverage and monitoring of coral reefs. A
variety of sensors and analyses have been employed for monitoring coral reefs: this study applied a spectrum-matching and
look-up-table methodology to the analysis of hyperspectral imagery of a shallow coral reef in the Bahamas. In unconstrained
retrievals the retrieved bathymetry was on average within 5% of that measured acoustically, and 92% of pixels had retrieved
depths within 25% of the acoustic depth. Retrieved absorption coefficients had less than 20% errors observed at blue wavelengths.
The reef scale benthic classification derived by analysis of the imagery was consistent with the percent cover of specific
coral reef habitat classes obtained by conventional line transects over the reef, and the inversions were robust as the results
were similar when the benthic classification retrieval was constrained by measurements of bathymetry or water column optical
properties. These results support the use of calibrated hyperspectral imagery for the rapid determination of bathymetry, water
optical properties, and the classification of important habitat classes common to coral reefs. |
| |
Keywords: | Coral reefs Remote sensing Optical properties Hyperspectral Benthic classification |
本文献已被 SpringerLink 等数据库收录! |
|