Torrential rain has fallen on the north of Kyushu Island, mainly in Kumamoto Prefecture and Oita Prefecture due to an active front at the end of rainy season. The precipitation from July 11 to 13 registered 650 millimeters in the city of Aso, Kumamoto Prefecture. It has caused rivers to burst their banks, muddy floodwaters, and land slides inflicting heavy casualties and damaging properties.
Stacks imagery by TerraSAR-X (Synthetic Aperture Radar Satellite) on July 18, 2012
(Currently acquired data)
|Date and time||:||July 18, 2012 at 06:19 (JST)|
|Date and time||:||September 12, 2007 at 06:19 (JST)|
What’s stacks (change detection) imagery?
By applying the imageries before disaster to red band, and the imageries after disaster to green and blue band, the resulting imagery turned darker into red and represented brighter into blue.
The reservoir surface of flood and natural damming, which commonly are shown in dark, turns into red. The denuded land, which is bright, turns into blue.
Utilizing this method, it can be efficient to interpret when the stricken area are extracted, and useful to grasp the damaged area during an emergency.
The whole map around Aso Caldera
The situation of whole area of Aso Caldera is not yet grasped. Most of imageries were covered by cloud even though the high-resolution satellite imageries were released on July 16. This is the first time to acquire imagery which indicated whole situation.
Flooded area can be seen stretched along Kurokawa River. On the other hand, patterns which indicate the flood can not be seen along Shirokawa River at Nangodani. Flooded area can be seen stretched from Tateno to downstream along Shirakawa. This scale is too small to identify however many patterns which seems to be denuded lands can be seen inside of Caldera, Nangodani and around Nekodake.
Flooded area along Kurokawa
The oblique photos near Sanno, Ichinomiya, Aso City and the stacks imagery of the same area. The flooded areas of both imageries are matched.
The oblique photos were taken on July 15, and the range of flood has not almost changed in two days.
Satellite imagery near Mount Aso by Pleiades (high-resolution optical satellite)
Imageries by high-resolution optical satellite, Pleiades, were acquired in the morning on July 16.
Click the imagery below to compare the satellite imageries by Pleiades after disaster and by the imagery (PASCO Satellite Ortho (PSO)) before disaster.
* This function is only for PC.
Interpreted imagery of the sediment movement near Aso
PASCO took aerial oblique photos on July 15 after the weather improved and the next morning, on July 16, acquired imageries by high-resolution optical satellite - Pleiades.
In the background of this imagery, the satellite data: PSO which is acquired before the disaster is utilized.
The interpreted range is the one which has high contrast. The yellow part is where the movement of sediment seems to have been newly occurred due to the torrential rain this time.
Interpretation of the sediment movement marks near Aso 1
Interpretation of the sediment movement marks near Aso 2
Interpretation of the sediment movement marks near Aso 3
Oblique Aerial Photographs on July 15, 2012
432148-120715-01 Near Teno, Ichinomiya, Aso City
432148-120715-02 Near Sanno, Ichinomiya, Aso City
432148-120715-03 Near Sakanashi, Ichinomiya, Aso City
432148-120715-04 Near Sakanashi, Ichinomiya, Aso City
432148-120715-05 Near Nekodake, Aso City
434035-120715-01 Near Tateno, Ozu Town
434035-120715-02 Near Tochigihara, Tateno, Ozu Town
431052-120715-01 Near Tatsudajinnai, Kita-ku, Kumamoto City
432105-120715-01 Near Fukumoto, Shisui, Kikuchi City
442038-120715-01 Kakisaka, Yabakei, Nakatsu City
442038-120715-02 Kakisaka, Yabakei, Nakatsu City
442038-120715-03 Kakisaka, Yabakei, Nakatsu City
442046-120715-01 Near Tomoda, Hita City
442046-120715-02 Near Nishi-arita Hita City
442046-120715-03 Near Miwa, Hita City
442089-120715-01 Near Uozumi, Taketa City
442089-120715-02 Near Taketa, Taketa City
442089-120715-03 Near Gotangiri, Taketa City
Imaging by TerraSAR-X (Synthetic Aperture Radar Satellite)
(Currently acquired data)
|Date and time||:||July 13, 2012 at 06:10 (JST)|
|Date and time||:||December 2, 2010 at 06:19 (JST)|
Estimated flooded area on July 13
PASCO urgently acquired imageries around Shirakawa River, the northeast side of Kumamoto City, by TerraSAR-X (Synthetic Aperture Radar Satellite) at 6pm on July 13.
The yellow ranges are indicating the extracted areas that were estimated to have been flooded by torrential rain when the imageries were acquired, by comparing the imageries of current flooding situation to past disaster of December 2, 2010
History of Information Released
From the perspective of understanding the damage situation arising as a result of the disaster, and of providing information to the relevant organizations, PASCO CORPORATION immediately conducted estimates of the damaged areas using SAR satellite images, which are not impacted by weather conditions.
PASCO CORPORATION also waited for weather conditions that would prevent the occurrence of secondary disasters, and then carried out aerial photographic surveys immediately in cooperation with KOKUSAI KOGYO CO., LTD.
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]>
<Pleiades : © CNES 2012, Distribution Astrium Services / Spot Image>
<TerraSAR-X : © 2012 Astrium Services / Infoterra GmbH, Distribution [PASCO]>
<Aerial photographs : PASCO, KOKUSAI KOGYO, Distribution[PASCO]>
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