TERN Geospatial Catalogue
Mangrove extent maps from orthomosaics, Kakadu National Park
<p>This data set consists of a shapefile/kml of mangrove extent and dominant species for Kakadu National Park mangroves generated from true colour aerial photographs acquired in 1991.</p>
<p>From true color 1991 orthomosaics of Field Island and the Wildman, West, and South Alligator Rivers, mangroves were mapped by first applying a fine scale spectral difference segmentation within eCognition to all three visible bands (blue, green, and red). A maximum likelihood (ML) algorithm within the environment for visualizing images (ENVI) software was then used to classify all segments using training areas associated with mangroves, but also water, mudflats, sandflats, and coastal woodlands. These were identified through visual interpretation of the imagery. Segmentation was necessary as 1) the diversity of structures and shadows within and between tree crowns limited the application of pixel-based classification procedures and 2) the color balance between the different photographs comprising the orthomosaics varied. All segments were examined individually and methodically to determine whether they should be reallocated to a non-mangrove class (e.g., mudflats) or confirmed as mangroves. Open woodlands dominated by Eucalyptus species could also be visually identified within the aerial photography (AP) orthoimages, although their discrimination was assisted by only considering areas where the underlying LiDAR DTM (Digital Terrain Model) exceeded 10 m, assuming this excludes tidally inundated sections.</p>
Simple
Identification info
- Date (Creation)
- 2022-02-03
- Date (Publication)
- 2022-02-10
- Date (Revision)
- 2014-07-14
- Edition
- 1.0
Publisher
Author
Contributor
Contributor
- Website
- https://www.tern.org.au/
- Purpose
- Defining the spatial extents at a given point in time provides a baseline to estimate changes over time, this enables informed decisions in environmental management practises.
- Credit
- We at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.
- Status
- Completed
Point of contact
- Topic category
-
- Environment
Extent
- Description
- Field Island and the Wildman, West, and South Alligator Rivers
))
Temporal extent
- Time period
- 1991-03-01 1991-03-01
Vertical element
- Minimum value
- 0.0
- Maximum value
- 0.0
- Reference system type
- Geodetic Geographic 3D
- Title
- Lucas Richard, Finlayson C. Max, Bartolo Renee, Rogers Kerrylee, Mitchell Anthea, Woodroffe Colin D., Asbridge Emma, Ens Emilie (2017) Historical perspectives on the mangroves of Kakadu National Park. Marine and Freshwater Research 69, 1047-1063.
- Website
-
Lucas Richard, Finlayson C. Max, Bartolo Renee, Rogers Kerrylee, Mitchell Anthea, Woodroffe Colin D., Asbridge Emma, Ens Emilie (2017) Historical perspectives on the mangroves of Kakadu National Park. Marine and Freshwater Research 69, 1047-1063.
Related documentation
- GCMD Science Keywords
- ANZSRC Fields of Research
- TERN Instrument Vocabulary
- TERN Parameter Vocabulary
- GCMD Horizontal Resolution Ranges
- GCMD Temporal Resolution Ranges
Resource constraints
- Use limitation
- The Creative Commons Attribution 4.0 International (CC BY 4.0) license allows others to copy, distribute, display, and create derivative works provided that they credit the original source and any other nominated parties. Details are provided at https://creativecommons.org/licenses/by/4.0/
- File name
- 88x31.png
- File description
- CCBy Logo from creativecommons.org
- File type
- png
- Title
- Creative Commons Attribution 4.0 International Licence
- Alternate title
- CC-BY
- Edition
- 4.0
- Access constraints
- License
- Use constraints
- Other restrictions
- Other constraints
- TERN services are provided on an "as-is" and "as available" basis. Users use any TERN services at their discretion and risk. They will be solely responsible for any damage or loss whatsoever that results from such use including use of any data obtained through TERN and any analysis performed using the TERN infrastructure. <br />Web links to and from external, third party websites should not be construed as implying any relationships with and/or endorsement of the external site or its content by TERN. <br /><br />Please advise any work or publications that use this data via the online form at https://www.tern.org.au/research-publications/#reporting
- Other constraints
- Please cite this dataset as {Author} ({PublicationYear}). {Title}. {Version, as appropriate}. Terrestrial Ecosystem Research Network. Dataset. {Identifier}.
Resource constraints
- Classification
- Unclassified
Distribution Information
Distributor
Distributor
Distribution Information
Distributor
Distributor
- OnLine resource
- Mangrove Extent Maps from orthomosaics, Kakadu National Park
Data quality info
- Hierarchy level
- Dataset
- Other
- <p>The photographs used for the mapping (frame size of 230x230 mm) were acquired by a Wild CR10 flying at 4000 m and the resulting orthomosaics and canopy height models (CHMs) were obtained at a spatial resolution approximating 1 m, with an assumed positional accuracy of <span>±</span> 50 m. Comparison with the ground-transect data collected in 1998 from the western bank of the West Alligator River confirmed that the canopy height estimated from the aerial photographs was within and often less than 2–3 m of the ground-based estimates, noting that there was a 7-year lag in the observation time.</p> <p>Details are provided in <a href="https://doi.org/10.1071/MF17065"> Lucas et al., 2017</a>.</p>
Report
Result
- Statement
- As neither finer spatial resolution airborne nor field data were acquired at the time of the airborne data acquisitions, the accuracy of the classifications could not be easily quantified. However, the refinement through visual interpretation provided a high level of confidence in the maps of mangroves derived from the segmented AP. To indicate the accuracy of the refined classification, 400 segments were randomly chosen and their assignment was assessed visually against interpretations of the original data. Overall accuracy of 92% was obtained for the AP classifications of mangrove and non-mangrove (e.g., saltmarsh and sediment).
Reference System Information
- Reference system identifier
- EPSG/EPSG:4326
- Reference system type
- Geodetic Geographic 2D
Metadata
- Metadata identifier
-
urn:uuid/0e62131b-dee1-4ac4-b273-af9cc21b4ae5
- Title
- TERN GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/0e62131b-dee1-4ac4-b273-af9cc21b4ae5
Point-of-truth metadata URL
- Date info (Creation)
- 2022-02-03T00:00:00
- Date info (Revision)
- 2022-02-03T00:00:00
Metadata standard
- Title
- ISO 19115-1:2014/AMD 1:2018 Geographic information - Metadata - Fundamentals
- Edition
- 1
Metadata standard
- Title
- ISO/TS 19115-3:2016
- Edition
- 1.0
Metadata standard
- Title
- ISO/TS 19157-2:2016
- Edition
- 1.0
- Title
- Terrestrial Ecosystem Research Network (TERN) Metadata Profile of ISO 19115-3:2016 and ISO 19157-2:2016
- Date (published)
- 2021
- Edition
- 1.0
Identifier
Overviews
Spatial extent
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