Authors / CoAuthors
Unknown
Abstract
Pan-sharpened satellite imagery of the Cocos (Keeling) Islands recorded using the QuickBird Digital Globe satellite, taken over the islands in November 2003. Each pixel represent 0.6m.
Product Type
dataset
eCat Id
81728
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Satellite Imagery
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- AU-ACT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2005-01-01T00:00:00
Creation Date
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Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
Quickbird satellite imagery of Cocos Islands was commissioned by the Department of Environment and Heritage in mid 2003 and supplied to the Australian Government by DigitalGlobe in November 2003. Satellite imagery of the Southern Atoll was supplied to the Australian Government by DigitalGlobe in November 2003 and North Keeling Island was sensed in January 2004. The Quickbird satellite recorded reflectance data of the islands in the red, green, blue, near infra-red and panchromatic bands, in 11 bit format. All sharpened imagery has a resolution of 0.6m/pixel. Geoscience Australia was supplied with the full multi-spectral data for the Cocos (Keeling) Islands in the form of an 8 bit TIFF image containing the red, green, blue and near infra-red bands. The panchromatic band was also supplied as an 8-bit TIFF. Digital Globe undertook pan-sharpening of the satellite imagery, in the process dividing the imagery into four sections. Four 8-bit pan-sharpened TIFFs, one for each of the four sections, containing the red, green and blue bands was supplied to GA. Each pixel on the pan sharpened imagery represents 0.6m. Further details regarding the satellite imagery can be viewed in the full DigitalGlobe documentation CocosGIS\data\sat_imagery\ DigGlobe_productguide_2003.pdf. All satellite images were supplied to Geoscience Australia in WGS84 Geographics. GA joined the images using ER Mapper 6.4 and then using the ER Mapper Geocoding Wizard GA reprojected the full image into UTM GDA94. [Previously due to restrictions in computer processing power and a file size limit in ER Mapper 6.3 the four pan sharpened images were reprojected separately which led to gaps appearing at the joins in the four sections. Also received from Digital Globe was a satellite image of North Keeling Island. As with the other satellite imagery this was supplied as a multi-chromatic, a pan-chromatic image and a pan sharpened the image. Using the ER Mapper Geocoding Wizard Geoscience Australia reprojected the image into UTM GDA94. DigitalGlobe advise that the positional accuracy of the imagery is +/-14.7m RMSE. Due to this low level of positional accuracy, an x y shift was also applied to more accurately position the imagery by correlation with the lodged cadastre on screen as follows: Before cadastral re-alignment (see cadastre section of manual): 16.9m East 6.9m South After cadastral re-alignment 2.4m West 3.14m South This shift brought the imagery inline with the current cadastre and reprojected orthophotography. Due to disk space limitations these images are stored in ECW (Enhanced Compressed Wavelet) format. The main Cocos island group is stored in the CocosGIS\data\sat_imagery\ecw directory under the filename of cocos_satim.ecw. The North Keeling Island ECW is located in the same directory with the filename nth_keeling.ecw
Parent Information
Extents
[-12.24, -12.05, 96.8, 96.95]
Reference System
Spatial Resolution
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