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Georectification of Quickbird image, December 2006, Heard Island
Entry ID: SIC_462_georectification


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Summary
Abstract: The orthorectification of the QuickBird image (15 December 2006, SIC 463) was done as part of the Heard Island AAS2939 project (Lucieer et al.). This QuickBird image was orthorectified and co-registered to the IKONOS Jan. 2004 image (metadata ID: SIC_266_267_georectification). All processing was done in ENVI 4.4 (http://www.ittvis.com).

Related URL
Link: GET DATA
Description: Download point for the PDF document.


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -52.9 S: -53.3  E: 73.9  W: 73.2

Temporal Coverage
Start Date: 2006-12-15
Stop Date: 2006-12-15


Location Keywords
OCEAN > SOUTHERN OCEAN
GEOGRAPHIC REGION > POLAR
OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS


Data Resolution
Latitude Resolution: 0.6 m
Longitude Resolution: 0.6 m


Science Keywords
SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS >VISIBLE IMAGERY    [Definition]


ISO Topic Category
IMAGERY/BASE MAPS/EARTH COVER


Platform
SATELLITES    [Information]
QUICKBIRD >DigitalGlobe's QuickBird    [Information]


Quality
The sequence of processing steps used were as follows:

Pansharpening
- Fuse or merge the high-resolution panchromatic band with the lower resolution multispectral bands to create a high-resolution multispectral image based on an image transform.
- Panchromatic band has to overlap with multispectral bands in wavelengths.
- Wavelet-based pansharpening is more correct from a spectral perspective than ENVIs pansharpening algorithms, such as HSV, Brovey, Gram-Schmidt, PCA, and CN.
- Wavelet Fusion is an ENVI extension available from the ITTVIS codebank http://www.ittvis.com/UserCommunity/CodeLibrary.aspx
- The input images are transformed into wavelet space. Their wavelet coefficients are combined. Then an inverse wavelet transform is applied to the combined wavelet coefficients to create the fused image.
- Fusion strength: the ratios used to blend together the wavelet coefficients of each image at each decomposition level. The settings used:
- Image A: Multispectral image
- Image B: PAN image
- Map projection: Match Image B (PAN)
- Fusion strength: 50:50
- Additional options: defaults
- Output file name: include psdwt (pansharpened with discrete wavelet transform)

Orthorectification

Orthorectification parameters in ENVI:
- Orthorectification was done without GCPs as the match between the DEM and the QuickBird image was very good. Co-registration was applied after orthorectification to fine-tune the image rectification and to match the QuickBird image to the 2004 IKONOS image (metadata ID: "SIC_266_267_georectification").
- RPC model based on the *.rpb file from the panchromatic band - RADARSAT 2002 DEM was first reprojected in ArcGIS, so that it is in a geographical coordinate system.
- The DEM resampling was set to Cubic convolution because it is upsampled to a higher resolution and cubic convolution results in a smoother interpolation.
- The Geoid offset was set to the default of 0.0 as no accurate geoid offset was found on the Geoscience Australia website.
- The projection was set to UTM, Zone 43 South with a WGS-84 Datum.
- The pixel size was set to 0.6 m in both X and Y directions.

Co-registration

Image to image GCPs were selected using a geographic link between the images to aid in feature identification.94 GCPs were identified spread out over the image. The RMS value for a 1st order polynomial was 17.31 pixels (10.4 m). However, as we applied a triangulation (rubber sheeting) transformation, this RMS value has no significant meaning. The QuickBird image was warped using the triangulation transformation method with nearest neighbour image resampling. Output: qb_15dec2006_ps_orc_tri2.bsq


Access Constraints
A PDF document providing further details is available for download from the URL given below.

Access to the image itself is limited owing to copyright issues. Contact the Australian Antarctic Data Centre for details and further information.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SIC_462_... when using these data.


Keywords
heard island


Data Set Progress
COMPLETE


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 180 kb
Distribution_Format: pdf
Fees: free


Personnel
ARKO LUCIEER
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 3 6226 2140
Email: arko.lucieer at utas.edu.au
Contact Address:
Censis
Private Bag 76
University of Tasmania
School Of Geography
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


URSULA HARRIS
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3519
Fax: +61 3 6232 3351
Email: gis at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Creation and Review Dates
DIF Creation Date: 2009-06-02
Last DIF Revision Date: 2016-01-27


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