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Is double the resolution twice as good?

Menges, Carl Heinz, Bell, Darren and Hill, Gregory James E. (2001). Is double the resolution twice as good?. In: International Geoscience and Remote Sensing Symposium (IGARSS), Sydney, 9-13 July 2001.

Document type: Conference Paper
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Author Menges, Carl Heinz
Bell, Darren
Hill, Gregory James E.
Title Is double the resolution twice as good?
Conference Name International Geoscience and Remote Sensing Symposium (IGARSS)
Conference Location Sydney
Conference Dates 9-13 July 2001
Place of Publication Piscataway, USA
Publisher IEEE
Publication Year 2001
Volume Number 4
ISBN 0-7803-7031-7   (check CDU catalogue open catalogue search in new window)
Start Page 1945
End Page 1947
Total Pages 3
HERDC Category E2 - Conference Publication - Full written paper, non refereed proceedings (internal)
Abstract With the increased pressure of better management of our dwindling resources, image fusion of data originating from different sensors and/or at different scales offer great potential. The methodology for scaling the individual data sets up or down is of major importance for image fusion of multiple resolution data. In this study the relationship between two multi-spectral data sets acquired at different resolutions (50 cm and 1 m nominal resolution) over the same area using the ADAR System 1000 is examined. Researchers often simulate coarser resolution data by averaging resolution cells over a given distance from a centre point. This is assumed to be an approximation to the actual point spread function of a sensor element, which is dependent on the sensor characteristics. To examine the spatial relationship between the two data sets the point spread function of the sensor is investigated by extracting a number of individual coarse scale elements and an array of fine scale resolution elements of varying size, centred at the position of the coarse scale element. A non-linear regression fitted to these data indicates the relative contribution of the fine scale resolution elements to the coarse scale data value. The results demonstrate that upscaling for this sensor must be based on weighted averaging over a much larger area than the coarse resolution cell indicates
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