[Source_Name: Short_Name='AERIAL PHOTOGRAPHS']
Heard Island Coastal Orthophotos derived from Non-Metric PhotographyEntry ID: HIC_NMOrthos
Abstract: The orthophoto is a rectified georeferenced image of the Heard Island Coastal Area. Distortions due to relief and tilt displacement have been removed. Orthophotos were derived from non-metric Hasselblad and Linhof cameras (focal length unknown).
The photos are between 17 MB and 193 MB each, and are in tiff format with associated world files.
Data Set Citation
Dataset Originator/Creator: Harris, U.
Dataset Title: Heard Island Coastal Orthophotos derived from Non-Metric Photography
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2004-08-02
Dataset Publisher: Australian Antarctic Data Centre
Version: 1Online Resource: https://data.aad.gov.au/metadata/records/HIC_NMOrthos
Start Date: 1980-01-01Stop Date: 1987-12-31
Latitude Resolution: 14 Metre(s)
Longitude Resolution: 14 Metre(s)
Quality A series of photographs covering the coastline of Heard Island were captured using a Linhof camera during 1987. Some smaller scale photography were also captured using a Hasselblad camera during 1980.
Dr Jenny Scott visited Heard Island during 2000 to conduct vegetation surveys. Dr Scott used the photography as a base for her mapping and also used a global positioning system to ... coordinate control points in the photography.
A digital elevation model was obtained from Radarsat using 1997 radar imagery. The aerial photographs were ortho rectified using the ground control obtained by Dr Scott and the digital elevation model obtained from Radarsat. The inner orientation parameters for the camera were unknown but the focal length was derived by first measuring the diagonal distance across the negative (this gave an approximate focal length for a normal angle lens). The final value for the focal length was computed using the ERDAS OrthoBase Pro Self Calibrating Bundle Adjustment software.
This software was used to perform a bundle adjustment on the photography using ground control and tie points. The bundle adjustment resulted in average errors of +/-7m in position and +/-5m in height. Each image was then ortho rectified using the orientation parameters derived from the bundle adjustment and the Radarsat DEM. The resulting images are expected to have an average positional accuracy of +/-14m. The pixel size on the ground for each image is 0.4m
Cape Arkona - Cape Pillar
Stephenson Lagoon - Winston Lagoon
Image file naming convention:
* Ortho indicates the image is ortho-rectified
* antcNNNN_ or cascNNNN_ indicates the film number
* _XX indicates the frame number
The coordinates for the images and shape files have the following parameters:
* Grid_Coordinate_System_Name: Universal Transverse Mercator
* UTM_Zone_Number: -43
* Scale_Factor_at_Central_Meridian: 0.999600
* Longitude_of_Central_Meridian: 75.000000
* Latitude_of_Projection_Origin: 0.000000
* False_Easting: 500000.000000
* False_Northing: 10000000.000000
* Planar_Coordinate_Encoding_Method: coordinate pair
* Abscissa_Resolution: 0.000032
* Ordinate_Resolution: 0.000032
* Planar_Distance_Units: meters
* Horizontal_Datum_Name: D_WGS_1984
* Ellipsoid_Name: WGS_1984
* Semi-major_Axis: 6378137.000000
* Denominator_of_Flattening_Ratio: 298.257224
Access Constraints Refer to the metadata record with ID HI_VEG_ORTHOPHOTOS_VEGMAP for information about access to the orthophotos used for the vegetation mapping project.
The orthophotos not used for the vegetation mapping project are available from the Australian Antarctic Data Centre. The file is HIC_NMOrthos.zip.
The centre points of the images are available for download as a shapefile at the provided URL.
Use Constraints This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/4.0/).
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=HIC_NMOr... when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 11.4 GB
Distribution Format: tiff
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3519
Fax: +61 3 6232 3351
Email: gis at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-04-02
Last DIF Revision Date: 2019-03-21