A large-scale flood hit the northeast part of Australia as a result of continuing torrential rains during the monsoon season at the end of December 2010. An extremely large area in the state of Queensland was incurred flood damages. According to some reports, the affected area covered a surface area that was almost the size of France and Germany combined. In Rockhampton city located in the central part of Queensland, the levees of the Fitzroy River flowing through the city broke, causing waters to inundate and bring damage to a wide area.
Imaging using TerraSAR-X (Synthetic Aperture Radar)
|Acquisition dates and times||:||08:20 May 14, 2008 (UTC)
08:20 Jan 07, 2011 (UTC)
|Angle of incidence||:||27.50°(Ascending)|
The image was created by overlapping TerraSAR-X images acquired on May 14, 2008 and January 7, 2011.
Taking advantage of the characteristics of TerraSAR-X images, we extracted the areas where changes were observed in the unevenness of the ground surface.
The areas shown in red are interpreted to be areas where changes had occurred due to flooding and other factors.
The whitish bands of areas along the Fitzroy River, downstream from Rockhampton City, are on slightly higher ground. They are believed to be areas that had escaped flooding due to differences in land use. Even from this image, we can see that the land from the west to the south of the Fitzroy River is low and suffers from poor drainage, and that there are many meandering river channels. We can also see that the gradient of the land was originally extremely gentle. Estimates show that a large expanse of regions like this became submerged in this flood disaster.
Estimated Range of Inundation
The area shown in blue in the figure below is the estimated range of inundation resulting from this flood disaster. Comparing images from before the disaster acquired on May 14, 2008) and after the disaster (taken on January 7, 2011), we extracted the range of inundation that had spread as a result of this flood.
History of Information Released
From the perspective of understanding the damage situation caused by the disaster, and of providing information to the relevant organizations, PASCO carried out estimations for the areas of damage immediately utilizing SAR satellite images, which are not impacted by weather conditions.
We express our deepest sympathy to all who have been affected by the disaster.
We will strive even harder to be of service to all through the application of our spatial information processing and analysis technologies, as well as through our disaster prevention consulting expertise, in order to obtain accurate information on the disaster situation and assist in the recovery of the affected areas.
<TerraSAR-X : InfoterraGmbH, Distribution [PASCO]>
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