A manual for conducting georeferenced photo transects surveys to assess the benthos of coral reef and seagrass habitats version 3.0

Roelfsema, C. M. and Phinn, S. R. (2009). A manual for conducting georeferenced photo transects surveys to assess the benthos of coral reef and seagrass habitats version 3.0. Centre for Remote Sensing and Spatial Information Science, The University of Queensland, Brisbane, Australia.

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Title A manual for conducting georeferenced photo transects surveys to assess the benthos of coral reef and seagrass habitats version 3.0
Abstract/Summary This manual describes the methods for gathering still photos (or video frame) of the benthos (horizontal or vertical) that have a known position in time and space. Photos can be used to quantitatively or qualitatively assess the benthos by determining: percentage horizontal projective cover (herein referred to as”% cover”); species composition (e.g. coral, algae, and seagrass) of benthic environments (e.g. sandy or rocky beaches, inter-tidal and rocky or coral reef areas), or indicators of health (e.g. coral bleaching, coral diseases). The method involves a GPS being towed by snorkeller/diver that is taking photos along a freely planned track. At set intervals, kick cycle or time estimates, horizontal projective photos or seascape photos are taken from the seabed. GPS coordinate are continuously recorded while towing the unit when swimming a transect and collecting photos. Photos are then linked with GPS coordinates using of the shelve software (e.g. GPS Photolink or other). This software enables synchronisation of camera and GPS time, after which photo position is determined through interpolation based on closest in time GPS positions. The photos can be viewed at its position in space in a GIS environment such as ARCGIS, Google Earth or other. Photos are analysed using standardized peer reviewed software Coral Point Count excel (Kohler et al., 2006). The method was initially developed to collect data intended to be used for the analysis of remotely sensed images (airborne and satellite images) of coral reef and seagrass environments. The method described can be used in the following situations: • In-water surveys (Snorkelling, Diving or Reef walking) • Boating surveys using o Drop (video or still) camera where GPS is in boat o Towed video where GPS is located in boat are on float above video.
Keyword Mapping
Benthos
GPS
Camera
Software
Publisher Centre for Remote Sensing and Spatial Information Science, The University of Queensland, Brisbane, Australia
Date 2009-01-01
Research Fields, Courses and Disciplines 0406 Physical Geography and Environmental Geoscience
Author Roelfsema, C. M.
Phinn, S. R.
Open Access Status File (Publisher version)
Institutional Status UQ

 
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