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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

(Click for Interactive Map)

Spatial coordinates

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

ISO Topic Category

IMAGERY/BASE MAPS/EARTH COVER

Platform

SATELLITES

QUICKBIRD > DigitalGlobe's QuickBird

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.

Ancillary Keywords

heard island

Data Set Progress

COMPLETE

Data Center

Australian Antarctic Data Centre, Australia

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: metadata 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: 2012-07-13

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