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Habitat map of seagrass cover derived from a supervised moderate-spatial-resolution multi-spectral satellite image, integrated with manual delineation and coincident field data, Moreton Bay, 2004

A supervised classification was applied to a Landsat TM5 image. This image was acquired on the 8th August 2004, 15 minutes after low tide. The image classification was applied on areas of clear waters up to three metres depth and for exposed regions of Moreton Bay. Field validation data was collected at 2800 survey sites by UQ, 18 Seagrass-Watch sites and 60 Port of Brisbane Corporation survey sites. GPS referenced field data were used as training areas for the image classification process. For this training the substrate DN signatures were extracted from the Landsat 5 TM image for field survey locations of known substrate cover, enabling a characteristic "spectral reflectance signature" to be defined for each target. The Landsat TM image, containing only those pixels in water < 3.0m deep, was then subject to minimum distance to means algorithm to group pixels with similar DN signatures (assumed to correspond to the different substrata). This process enabled each pixel to be assigned a label of either seagrass cover (0, 1-25 %, 25-50 %, 50-75 % and 75-100 %). The resulting raster data was then converted into a vector polygon file. Species information was added based on the field data and expert knowledge.


Both polygon files were joined by overlaying features of remote sensing files with the EHMP field data to produce an output theme that contains the attributes and full extent of both themes. If polygons of remote sensing were within polygons of field data the assumption was made that the remote sensing polygon was showing more detail and the underlying field polygon was deleted.

Simple

Identification info

Date (Creation)
2005-12-21
Date (Publication)
2017-04-27

Custodian

Centre for Remote Sensing and Spatial Information Science (CRSSIS), School of Geography, Planning and Environmental Management, The University of Queensland (UQ)
Steele Building (Building 3), Level 2, Room 210
University of Queensland (UQ)
St Lucia
Queensland
4072
Australia

Custodian

Environmental Protection Agency (EPA), Queensland Government - Data Coordinator
PO Box 155
Brisbane Albert Street
Queensland
4002
Australia
(07) 3227 6459
Status
Completed

Point of contact

Department of National Parks, Sport and Racing (NPSR), Queensland Government - Udy, Nicola
GPO Box 2454
Queensland
4001
Australia
61 7 3199 7624

Point of contact

School of Earth and Environmental Sciences, The University of Queensland (UQ) - Roelfsema, Christiaan
Chamberlain Building (35), Room 416B
University of Queensland (UQ)
St Lucia
Queensland
3072
Australia
(07) 4232 2015

Spatial resolution

Equivalent scale

Denominator
250
Topic category
  • Biota

Extent

N
S
E
W


Temporal extent

Time position
2004-07-01T00:00:00
Time position
2005-05-31T00:00:00
Maintenance and update frequency
Not planned

Resource format

Title
ESRI Shapefile
Date
Edition
-
Keywords (Theme)
  • Moreton Bay Marine Park
  • vegetation
  • biota
  • ecology
  • estuarine
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)
  • Moreton Bay
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)
AODN Platform Vocabulary
  • orbiting satellite
AODN Discovery Parameter Vocabulary
  • Biotic taxonomic identification
Keywords (Theme)
  • Benthic habitat
AODN Instrument Vocabulary
  • cameras

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
Cite data as: Roelfsema, Christiaan M; Phinn, Stuart R; Maxwell, Paul; Udy, Nicola (2015): Habitat map of seagrass cover derived from a supervised moderate-spatial-resolution multi-spectral satellite image, integrated with manual delineation and coincident field data, Moreton Bay, 2004, with link to shapefile. PANGAEA, https://doi.org/10.1594/PANGAEA.846270
Other constraints
This dataset is hosted by the Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, on behalf of the University of Queensland for the purposes of the Seamap Australia collaborative project.
Language
English
Character encoding
UTF8
Supplemental Information
Roelfsema, Christiaan M; Lyons, Mitchell B; Kovacs, Eva M; Maxwell, Paul; Saunders, Megan I; Samper-Villarreal, Jimena; Phinn, Stuart R (2014): Multi-temporal mapping of seagrass cover, species and biomass: A semi-automated object based image analysis approach. Remote Sensing of Environment, 150, 172-187, doi:10.1016/j.rse.2014.05.001 Roelfsema, Christiaan M; Phinn, Stuart R; Udy, Nicola; Maxwell, Paul (2009): An integrated field and remote sensing approach for mapping Seagrass Cover, Moreton Bay, Australia. Journal of Spatial Science, 54(1), 45-62, doi:10.1080/14498596.2009.9635166

Content Information

Content type
Physical measurement
Description
Taxonomic identification of dominant seagrass species

Identifier

Code
Biotic taxonomic identification
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 (Moreton Bay seagrass) in Shapefile format.

OnLine resource
seamap:SeamapAus_QLD_MoretonBay_seagrass_2004

MAP - Moreton Bay seagrass 2004 habitat map

OnLine resource
Original metadata record [PANGAEA catalogue]

Data quality info

Hierarchy level
Dataset

Report

Measure description
Polygons +/- 10m. Positional accuracy of polygon linework is noted in the field 'Pos_Acc' which gives a reliability code of high, moderate, or low confidence in accuracy for polygons derived from the EHMP field survey sites. The level is derived on the basis of positioning and the frequency of survey sites, the distinctiveness of discrete boundaries evident from the field surveys and the georeferencing accuracy of the satellite image.

Report

Name of measure
Attribute accuracy
Measure description
Attribute accuracy for the field denoting cover, is provided in the field “Att_acc”. It gives, for the polygons derived from the EHMP survey sites, a reliability code of high, moderate, or low confidence in accuracy. The level is determined on the basis of reliability of field observations. For polygons derived from the classification of the satellite image, attribute accuracy is denoted as “OA 60%” or “OA 72%”. Where OA stands for “Overall Accuracy” which is commonly expressed as the probability that a classified image pixel actually represents that category on the ground. Attribute accuracy for the field denoting seagrass species is provided in the field “Att_acc_sp” which gives a reliability code of high, moderate, or low confidence in accuracy. This level is determined on the basis of reliability of field observations.

Report

Name of measure
Logical consistency
Measure description
All polygons visually checked at a scale of 1:500.

Resource lineage

Statement
Polygon boundaries and attributes derived from field and satellite image data. Field data Polygon boundaries digitised using information from 4900 EHMP survey sites and bathymetry data at scales ranging from 1:300 to 1:5000 depending on the size of the polygon.
Hierarchy level
Dataset

Resource lineage

Statement
The field,'seagrass', provides a description of the visually estimated ground cover of the seagrass and is generally classed as either: • 0-25% cover (sparse) • 25-50% cover (low) • 50-75% cover (medium) • 75-100% cover (dense) The fields,'H_ovalis’, ‘Z_muelleri’, ‘H_spinulosa’, ‘H_uninervis’, ‘C_serrulata’, and ‘S_isoetifolium’ refer to the relative proportion of the seagrass species occurring within each polygon. The field, ‘Source_type’ refers to how the attribute and spatial information was acquired and includes satellite image, snorkel, drop camera held over the side of a stationary vessel and expert knowledge. The field, ‘Source_data’ refers to the organisation / program responsible for data collection and analysis. The field, ‘Polygon’ refers to how the polygon was created. The field, ‘Rs_domain’ refers to the domain for which the image data is analysed (exposed regions or shallow clear waters).
Hierarchy level
Attribute
Hierarchy level
Dataset

Platform

Identifier

Code
orbiting satellite

Instrument

Identifier

Code
cameras

Metadata

Metadata identifier
5b06aeef-979b-4d09-8e78-0170cbdb8869

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/5b06aeef-979b-4d09-8e78-0170cbdb8869

Point of truth URL of this metadata record

Date info (Creation)
2021-03-25T16:16:06
Date info (Revision)
2021-03-25T16:16:06

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

Spatial extent

N
S
E
W


Keywords

Benthic habitat Moreton Bay Marine Park biota ecology estuarine vegetation
AODN Discovery Parameter Vocabulary
Biotic taxonomic identification
AODN Platform Vocabulary
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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Associated resources

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