Roelfsema, Christiaan M; Kovacs, Eva M; Markey, Katherine; Phinn, Stuart R (2022): Georeferenced photographs of benthic photoquadrats acquired over seven reefs in the Townsville to Whitsundays region of the Great Barrier Reef, May/June, 2019 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.953057
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Published: 2022-12-21 • DOI registered: 2023-02-08
Abstract:
Underwater georeferenced photo-transect surveys were conducted at different locations: in the shallow waters of the Reef Flat (0.5-2.5m) by a snorkeller, or, along a 5m depth contour of the Reef Slope by a diver. For these surveys, the snorkellers or divers traversed a pre-determined transect 250-1000 m in length, 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. The camera lens provided a 1.0 m x 1.0 m footprint, at 0.5 m height above the benthos. Horizontal distance between photoquadrats was estimated by fin kicks of the surveyor, and corresponded to a surface distance of approximately 2.0 - 4.0 m.
The coordinates of each photoquadrat were approximated based on the timestamp of the photoquadrat and the GPS timestamp, using custom software. Coordinates of each photoquadrat were interpolated by finding the GPS coordinates that were logged at a set time before and after the photoquadrat was captured.
Photoquadrats were collected with the purpose of determination of the benthic composition of each photoquadrat and to subsequently use this georeferenced field data for calibration and validation of benthic habitat maps. Transect location, direction and depth were chosen for this purpose and so as to characterise the variation in benthic cover types present on coral reefs. Photoquadrat interval along the transects was chosen to reflect the resolution of high spatial resolution satellite image data types.
Project(s):
GBR habitat mapping (GBR_MAP)
Coverage:
Median Latitude: -19.454002 * Median Longitude: 148.933418 * South-bound Latitude: -20.099090 * West-bound Longitude: 147.405178 * North-bound Latitude: -18.570836 * East-bound Longitude: 149.847903
Date/Time Start: 2019-05-29T00:00:00 * Date/Time End: 2019-06-05T00:00:00
Event(s):
Townsville-Whitsunday * Latitude: -19.400000 * Longitude: 148.834000 * Location: Great Barrier Reef, Australia
Comment:
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Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Kovacs, Eva M | Geocode | ||
| 2 | File name | File name | Kovacs, Eva M | |||
| 3 | LATITUDE | Latitude | Kovacs, Eva M | Geocode | ||
| 4 | LONGITUDE | Longitude | Kovacs, Eva M | Geocode | ||
| 5 | Image | IMAGE | Kovacs, Eva M |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
39132 data points
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Datasets with similar metadata
- Roelfsema, CM; Kovacs, EM; Markey, K et al. (2022): Georeferenced photographs of benthic photoquadrats acquired over seven reefs in the Mackay to Capricorn region of the Great Barrier Reef, May, 2019. https://doi.org/10.1594/PANGAEA.953063
- Roelfsema, CM; Kovacs, EM; Phinn, SR (2017): Georeferenced photographs of benthic photoquadrats acquired along 160 transects distributed over 23 reefs in the Cairns to Cooktown region of the Great Barrier Reef, January and April/May, 2017. https://doi.org/10.1594/PANGAEA.877578
- Roelfsema, CM; Kovacs, EM; Stetner, D et al. (2018): Georeferenced benthic photoquadrats captured annually from 2002-2017, distributed over Heron Reef flat and slope areas. https://doi.org/10.1594/PANGAEA.894801
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