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.
Start Date: 1980-01-01Stop Date: 1987-12-31
Latitude Resolution: 14m
Longitude Resolution: 14m
ISO Topic Category
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 The data are available on a CD or DVD. Contact the Technical Contact at the AADC for details. The centre points for each image are available for download at the url given below.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at the URL below when using these data.
Data Set Progress
Distribution Media: DVD
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: 2016-11-18