TERN Geospatial Catalogue
Orthomosaics Aerial photography for Kakadu National Park
<p>This data set consists of .tif files of true colour orthomosaics for expansive areas of mangroves in Kakadu National Park in Australia's Northern Territory.</p>
<p>The orthomosaics were generated from 68 stereo pairs of true colour aerial photographs acquired in 1991 in the lower reaches of the East Alligator, West Alligator, South Alligator and Wildman Rivers and Field Island, Kakadu National Park, Northern Australia (Mitchell et al., 2007). The photographs were taken at a flying height of 13,000 ft (3,960 m) using a Wild CR10, a standard photogrammetric camera with a frame size of 230 x 230 mm. The focal length was 152 mm. The photographs were scanned by Airesearch (Darwin) with a photogrammetric scanner to generate digital images with a pixel resolution between 12 and 15 mm. The orthomosaics have a spatial resolution of 1 m, cover an area of approximately 742 km<sup>2</sup> and a coastal distance of 86 km. </p>
<p>These orthomosaics were co-registered using ground control points identified from 1:100,000 digital topographic maps with a Universal Transverse Mercator (UTM), and subsequently co-registered to LiDAR data acquired over the same region in 2011.</p>
Simple
Identification info
- Date (Creation)
- 2022-02-01
- Date (Publication)
- 2022-02-24
- Date (Revision)
- 2022-02-01
- Edition
- 1.0.0
Publisher
Author
- Website
- https://www.tern.org.au/
- Purpose
- Orthomosaic maps can help in a number of ways by providing a detailed, accurate map of the conditions in a given area.
- Status
- Completed
Point of contact
Spatial resolution
- Level of detail
- 1 meter - < 30 meters
- Topic category
-
- Imagery base maps earth cover
Extent
- Description
- Mangroves within the lower reaches of the East Alligator, West Alligator, South Alligator, Wildman Rivers and Field Island, Kakadu National Park, Northern Australia
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Temporal extent
- Time period
- 1991-05-01 1991-05-01
- Title
- Lucas R. M., Milne A. K., Mitchell A., Donnelly B. and Ellison J., 2000. Use of stereo aerial photography for assessing changes in the extent and height of mangrove canopies in tropical Australia. Proceedings of IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment, vol.5: pp.1880-1882.
- Title
- Mitchell, A.L., Lucas, R.M., Donnelly, B.E., Pfitzner, K., Milne, A.K. and Finlayson, C., 2007. A new map of mangroves for Kakadu National Park, Northern Australia, based on stereo aerial photography. Aquatic Conservation: Marine and Freshwater Ecosystems, 17(5): pp.446-467.
- Title
- Asbridge, E. and Lucas, R.M., 2016. Mangrove response to environmental change in Kakadu National Park. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 9(12), pp.5612-5620.
- Website
-
Asbridge, E. and Lucas, R.M., 2016. Mangrove response to environmental change in Kakadu National Park. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 9(12), pp.5612-5620.
Related documentation
- Title
- Lucas, R., Finlayson, C.M., Bartolo, R., Rogers, K., Mitchell, A., Woodroffe, C.D., Asbridge, E. and Ens, E., 2017. Historical perspectives on the mangroves of Kakadu National Park. Marine and Freshwater Research, 69(7), pp.1047-1063.
- Website
-
Lucas, R., Finlayson, C.M., Bartolo, R., Rogers, K., Mitchell, A., Woodroffe, C.D., Asbridge, E. and Ens, E., 2017. Historical perspectives on the mangroves of Kakadu National Park. Marine and Freshwater Research, 69(7), pp.1047-1063.
Related documentation
- Title
- Jones, A.D., 1982. Manual of Photogrammetry, eds Slama, C.C., Theurer, C. and Hendrikson, S.W., American Society of Photogrammetry, Falls Church, Fourth Edition, 1056 pages.
- Website
-
Jones, A.D., 1982. Manual of Photogrammetry, eds Slama, C.C., Theurer, C. and Hendrikson, S.W., American Society of Photogrammetry, Falls Church, Fourth Edition, 1056 pages.
Related documentation
- Keywords
- GCMD Earth Science and Earth Science Services Keywords
- Temporal Resolution
- ANZSRC Fields of Research
- Keywords (dataResolution)
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
- OnLine resource
-
Orthomosaics Aerial photography
Orthomosaics Aerial photography
Distribution Information
Distributor
Distributor
- OnLine resource
-
Kakadu_NP_Aerial_Images.png
Data file
Distribution Information
Distributor
Distributor
- OnLine resource
-
Orthoimages_AlligatorRivers1991.png
Data file
Data quality info
- Hierarchy level
- Dataset
Report
Result
- Statement
- Accordingly, the absolute accuracy of the position of any object point on the orthophoto-image was of the order of 50 m. The accuracy of the scale of the orthophoto-image was higher as this depends upon the distance between GCPs; the greater this distance, the more accurate the scale. Hence, relative measurements between points on the orthophoto-image were more accurate than the absolute accuracy of their positions. The mosaics (with the exception of the East Alligator orthomosaics) were registered subsequently to LiDAR acquired in 2011 by Asbridge and Lucas (2016), with this producing a positional error of < 5 m and typically < 2 m. The mosaics registered to the 2011 LiDAR data are provided through this portal. The East Alligator River mosaic (not registered to the LiDAR data) is also provided for completeness.
Resource lineage
- Hierarchy level
- Dataset
Process step
- Description
- Digitizing points from 1:100 000 scale maps implied an accuracy of 0.5 mm on the map and hence 50 m on the ground. Based on the topographic map scale, the horizontal and vertical (absolute) accuracies of the ground control points (GCPs) were estimated at 50 m and 2 m respectively. The overall integrity of the registration was high as numerous tie points were located in the overlapping regions to assist in stabilizing adjoining images.
- Title
- Overview
Process step
- Description
- Following collection of GCPs, the Kakadu National Park (KNP) photographs were orientated using standard collinearity equations (Jones, 1982) and resampled to 0.37 m spatial resolution. The output from the transformation gave residuals (root mean square errors; RMSE) to all point measurements in image coordinates. These residuals were checked and, where necessary, new points were taken or existing ones were relocated until the residuals were less than one pixel, thus ensuring that the relative positioning within the block was of the order of one pixel (or 0.37 m) on the ground. The residuals on the GCPs were checked to ensure that they were within the predicted horizontal (i.e. 50 m) and vertical accuracy (i.e. 2 m).
- Title
- Methods
Reference System Information
- Reference system identifier
- EPSG/WGS84 (EPSG:4326)
Metadata
- Metadata identifier
- urn:uuid/35b183bc-f5f8-4bdd-8607-af425042f49e
- 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/35b183bc-f5f8-4bdd-8607-af425042f49e
Point-of-truth metadata URL
- Date info (Creation)
- 2008-11-12T00:00:00
- Date info (Revision)
- 2022-07-11T01:13:51
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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W
Provided by
Associated resources
Not available