Benthic and substrate cover data derived from photo-transect surveys in Kadavu, Fiji on June, July, October and November 2009.

Wendt, Hans, Roelfsema, Christiaan M. and Comely, James (2015): Benthic and substrate cover data derived from photo-transect surveys in Kadavu, Fiji on June, July, October and November 2009.. Pangaea. Dataset. doi:10.1594/PANGAEA.831257


 
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Project description
Underwater georeferenced photo-transect survey was done on June 17-30, July 1-21, October 7-29 and November 5-9 2009 at different sections of the reef flat, reef crest and reef slope in Kadavu, Fiji. For this survey a snorkeler or diver swam over the bottom while taking photos of the benthos at a set height using a standard digital camera and towing a surface float GPS which was logging its track every five seconds. A standard digital compact camera was placed in an underwater housing and fitted with a 16 mm lens which provided a 1.0 m x 1.0 m footprint, at 0.5 m height above the benthos. Horizontal distance between photos was estimated by three fin kicks of the survey diver/snorkeler, which corresponded to a surface distance of approximately 2.0 - 4.0 m. The GPS was placed in a dry-bag and logged its position as it floated at the surface while being towed by the photographer. A total of 8323 benthic photos were taken. A floating GPS setup connected to the swimmer/diver by a line enabled recording of coordinates of each benthic (Roelfsema and Phinn, 2009).
Approximation of coordinates of each benthic photo was done based on the photo timestamp and GPS coordinate time stamp, using GPS Photo Link Software (http://www.geospatialexperts.com). Coordinates of each photo were interpolated by finding the gps coordinates that were logged at a set time before and after the photo was captured.
Benthic or substrate cover data was derived from each photo by randomly placing 24 points over each image using the Coral Point Count excel program (Kohler and Gill, 2006). Each point was then assigned to a specific cover type, which represented the benthic feature beneath it. Benthic cover composition summary of each photo scores was generated automatically using CPCE program. The resulting benthic cover data of each photo was linked to gps coordinates, saved as an ArcMap point shapefile, and projected Universal Transverse Mercator Zone 60 South and Datum used was WGS 84.

Contact name Christiaan M. Roelfsema
Contact email c.roelfsema@uq.edu.au
Creator name Wendt, Hans
Roelfsema, Christiaan M.
Comely, James
Creator(s) role Principal Investigator
Dataset name Benthic and substrate cover data derived from photo-transect surveys in Kadavu, Fiji on June, July, October and November 2009.
Dataset description
Benthic or substrate cover data was derived from each photo by randomly placing 24 points over each image using the Coral Point Count excel program (Kohler and Gill, 2006). Each point was then assigned to a specific cover type, which represented the benthic feature beneath it. Benthic cover composition summary of each photo scores was generated automatically using CPCE program. The resulting benthic cover data of each photo was linked to gps coordinates, saved as an ArcMap point shapefile, and projected Universal Transverse Mercator Zone 60 South and Datum used was WGS 84.
Access conditions Open Access
Licencing and terms of access Creative Commons Attribution (only)

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ANZSRC Field of Research (FoR) Code 040699 Physical Geography and Environmental Geoscience not elsewhere classified
060205 Marine and Estuarine Ecology (incl. Marine Ichthyology)
050299 Environmental Science and Management not elsewhere classified
050210 Pacific Peoples Environmental Knowledge
050206 Environmental Monitoring
050205 Environmental Management
050204 Environmental Impact Assessment
DOI 10.1594/PANGAEA.831257
Related Publications
Kohler, Kevin E; Gill, Shaun M (2006): Coral Point Count with Excel extensions (CPCe): A Visual Basic program for the determination of coral and substrate coverage using random point count methodology. Computers & Geosciences, 32(9), 1259-1269, doi:10.1016/j.cageo.2005.11.009
Type of data ArcMap Point shapefiles
Data Volume 324KB
Language eng
Collection start date 2009-06
Collection end date 2009-11
Time coverage start date 2009-06
Time coverage end date 2009-11
Keyword Benthic habitat mapping
Remote sensing
Coral reefs
Fiji
Geographic co-ordinates

178.485947,-18.930645 177.951393,-18.930645 177.951393,-19.163006 178.485947,-19.163006 178.485947,-18.930645

Collection type Dataset
Publisher Pangaea
Publication Year 2015
Copyright notice 2015, The University of Queensland

 
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Created: Tue, 17 Mar 2015, 13:07:36 EST by Susan Wilson