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Seagrass meadow extents derived from field to spaceborne earth observation at Yule Point, Great Barrier Reef, October 2017 to July 2020

Seagrass meadow extent and meadow-scape was mapped using four alternative approaches at Yule Point, a coastal clear water habitat, in the Cairns section of the Great Barrier Reef, between October 2017 and July 2020. Approach 1 included mapping meadow boundaries and meadow-scape during low spring tides on foot using a handheld GPS. Approach 2 was where the meadows were surveyed at low tide with observations from a helicopter, with observational spot-checks conducted at a number haphazardly scattered points. Approach 3 used imagery collected during low spring tides with a UAV at an altitude of 30 m with a resolution of 0.2cm/pixel. Approach 4 used PlanetScope Dove imagery captured on 05 September 2017 and 09 August 2019 coinciding as close as possible to the field-surveys in 2017 and 2019, with 3.7 m x 3.7 m pixels (nadir viewing) acquired from the PlanetScope archive.


This record describes meadow extent data collected using Approach 4 (PlanetScope imagery). View the original metadata record at https://doi.pangaea.de/10.1594/PANGAEA.946604 for the full data collection.

Simple

Identification info

Alternate title
YP_seagrass_by_spaceborne_20190809
Alternate title
YP_seagrass_by_spaceborne_20170905
Date (Creation)
2022-05-26
Date (Publication)
2023-02-21

Principal investigator

Centre for Tropical Waters and Aquatic Research (TropWATER), James Cook University (JCU) - Langlois, Lucas
James Cook University (JCU)
PO Box 6811
Cairns
Queensland
4870
Australia

Co-author

Centre for Tropical Waters and Aquatic Research (TropWATER), James Cook University (JCU) - McKenzie, Len
Status
Completed

Point of contact

Centre for Tropical Waters and Aquatic Research (TropWATER), James Cook University (JCU) - Langlois, Lucas
James Cook University (JCU)
PO Box 6811
Cairns
Queensland
4870
Australia
Spatial representation type
Vector
Topic category
  • Biota

Extent

N
S
E
W


Temporal extent

Time period
2017-10-17 2020-07-30

Resource format

Title
ESRI Shapefile
Date
Edition
-
Global Change Master Directory (GCMD) Earth Science Keywords Version 8.0
  • EARTH SCIENCE | BIOSPHERE | AQUATIC ECOSYSTEMS | MARINE HABITAT
  • EARTH SCIENCE | BIOLOGICAL CLASSIFICATION | PLANTS | ANGIOSPERMS (FLOWERING PLANTS) | MONOCOTS | SEAGRASS
Keywords (Place)
  • Great Barrier Reef
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
  • Marine and Estuarine Ecology (incl. Marine Ichthyology)
  • Environmental Management
  • Environmental Sciences not elsewhere classified
AODN Platform Vocabulary
  • human
  • orbiting satellite
AODN Discovery Parameter Vocabulary
  • Abundance of biota
Keywords (Theme)
  • Benthic habitat
  • reef
  • machine learning
  • deep learning
  • coastal

Resource specific usage

Specific usage
Data supplied for use by the Seamap Australia Project.

- ()

Resource constraints

Classification
Unclassified

Resource constraints

Linkage
http://i.creativecommons.org/l/by/4.0/88x31.png

License Graphic

Title
Creative Commons Attribution 4.0 International License


>

Website
http://creativecommons.org/licenses/by/4.0/

License Text

Other constraints
Langlois, Lucas; McKenzie, Len J (2022): Seagrass meadows derived from field to spaceborne earth observation at Yule Point, a coastal habitat in the Cairns section of the Great Barrier Reef, October 2017 to July 2020. PANGAEA, https://doi.org/10.1594/PANGAEA.946604
Other constraints
This dataset is a reduced version of the full dataset, available at https://doi.pangaea.de/10.1594/PANGAEA.946604, and is hosted by the Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, on behalf of James Cook University (JCU) for the purposes of the Seamap Australia collaborative project.
Language
English
Character encoding
UTF8

Content Information

Content type
Physical measurement
Description
Appended to original data for styling purposes for the Seamap Australia Project
Name
Benthic habitat

Name
SM_HAB_CLS

Distribution Information

Distribution format
  • ESRI Shapefile

OnLine resource
SHAPE-ZIP

DATA ACCESS - This OGC WFS service returns the data (Yule Point seagrass) in Shapefile format.

OnLine resource
seamap:SeamapAus_QLD_YulePoint_seagrass_2019

MAP - Yule Point seagrass

OnLine resource
Original metadata record [PANGAEA catalogue]

Resource lineage

Statement
Spatially explicit seagrass maps were created from PlanetScope Dove imagery, and classified using a machine-learning model (Random Forest) coupled with a Boot-strapping process (100 iterations). The final model predictions were then gathered into separate rasters, based on Bootstrap Probability thresholds of 60% and 100%. The final rasters were cleaned using a majority filter algorithm, to eliminate stray pixel predictions using a moving window between 3 and 9 pixels depending on the size of the imagery. For Approach 4, we created spatially explicit seagrass maps from PlanetScope Dove imagery, and conducted the classification using a machine-learning model (Random Forest) coupled with a Boot-strapping process (100 iterations). Due to the lower seagrass density and occurrence of morphologically smaller species, the classes used were: (1) bare sediment, (2) low seagrass cover (>0 ≤25%), AND (3) high seagrass cover (>25%). The final raster was cleaned using a majority filter algorithm, to eliminate stray pixel predictions using a moving window between 3 and 9 pixels depending on the size of the imagery. All meadows captured on 05 September 2017 and 09 August 2019 are represented. Seagrass distribution and abundance can change seasonally and between years, and users should ensure that they make appropriate enquires to determine whether new information is available on the particular subject matter. Model accuracy is 98.8±0.0002% and 93.69±0.0009% for 2017 and 2019, respectively.
Hierarchy level
Dataset
Hierarchy level
Dataset

Platform

Identifier

Code
human
Hierarchy level
Dataset

Platform

Identifier

Code
diver

Metadata

Metadata identifier
dbc3c0e6-0597-4c57-b9ee-ff2de41d9e83

Language
English
Character encoding
UTF8

Point of contact

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - IMAS Data Manager
Parent metadata
  • Seamap Australia National Benthic Habitat Layer (NBHL)

Type of resource

Resource scope
Dataset
Metadata linkage
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/dbc3c0e6-0597-4c57-b9ee-ff2de41d9e83

Point of truth URL of this metadata record

Date info (Creation)
2020-09-23T12:36:21
Date info (Revision)
2020-09-23T12:36:21

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

tropwater.jpg

Spatial extent

N
S
E
W


Keywords

Benthic habitat coastal deep learning machine learning reef
AODN Discovery Parameter Vocabulary
Abundance of biota
AODN Platform Vocabulary
human orbiting satellite
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
Environmental Management Environmental Sciences not elsewhere classified Marine and Estuarine Ecology (incl. Marine Ichthyology)
Global Change Master Directory (GCMD) Earth Science Keywords Version 8.0
EARTH SCIENCE | BIOLOGICAL CLASSIFICATION | PLANTS | ANGIOSPERMS (FLOWERING PLANTS) | MONOCOTS | SEAGRASS EARTH SCIENCE | BIOSPHERE | AQUATIC ECOSYSTEMS | MARINE HABITAT

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Access to the record in catalogue
Read here the full details and access to the data.

Associated resources

Not available


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