Imaging Northern Kyushu Area damaged by torrential rain in July 2012

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

Image

Specifications

(Currently acquired data)

Date and time : July 18, 2012 at 06:19 (JST)
Imaging Orbit : Descending
Imaging Mode : StripMap
Polarization : HH
Incidence Angle : 39.16°
Product Type : GEC

(Comparative data)

Date and time : September 12, 2007 at 06:19 (JST)
Imaging Orbit : Descending
Imaging Mode : StripMap
Polarization : HH
Incidence Angle : 39.16°
Product Type : GEC

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 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

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.


Denuded land inside Caldera, Nangodani

Denuded land inside Caldera, Nangodani

Since there is a possibility of collapse and sediment inside of Caldera, Nangodani and near Nekodake, an urgent survey is necessary.
It indicated the pattern of denuded land near Takamori.

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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.

Sensuikyo Area

before after

Sakanashi Area

before after

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Interpreted imagery of the sediment movement near Aso

Index: Interpreted image of the sediment movement near Aso

Index: Interpreted image 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 1
  • Interpretation of the sediment movement marks near Aso 2
    Interpretation of the sediment movement marks near Aso 2
  • Interpretation of the sediment movement marks near Aso 3
    Interpretation of the sediment movement marks near Aso 3

  • Interpretation of the sediment movement marks near Aso 4
    Interpretation of the sediment movement marks near Aso 4
  • Interpretation of the sediment movement marks near Aso 5
    Interpretation of the sediment movement marks near Aso 5

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Oblique Aerial Photographs on July 15, 2012

Kumamoto Prefecture

  • 432148-120715-01 Near Teno, Ichinomiya, Aso City
    432148-120715-01 Near Teno, Ichinomiya, Aso City
  • 432148-120715-02 Near Sanno, Ichinomiya, Aso City
    432148-120715-02 Near Sanno, Ichinomiya, Aso City
  • 432148-120715-03 Near Sakanashi, Ichinomiya, Aso City
    432148-120715-03 Near Sakanashi, Ichinomiya, Aso City

  • 432148-120715-04 Near Sakanashi, Ichinomiya, Aso City
    432148-120715-04 Near Sakanashi, Ichinomiya, Aso City
  • 432148-120715-05 Near Nekodake, Aso City
    432148-120715-05 Near Nekodake, Aso City
  • 434035-120715-01 Near Tateno, Ozu Town
    434035-120715-01 Near Tateno, Ozu Town

  • 434035-120715-02 Near Tochigihara, Tateno, Ozu Town
    434035-120715-02 Near Tochigihara, Tateno, Ozu Town
  • 431052-120715-01 Near Tatsudajinnai, Kita-ku, Kumamoto City
    431052-120715-01 Near Tatsudajinnai, Kita-ku, Kumamoto City
  • 432105-120715-01 Near Fukumoto, Shisui, Kikuchi City
    432105-120715-01 Near Fukumoto, Shisui, Kikuchi City

Oita Prefecture

  • 442038-120715-01 Kakisaka, Yabakei, Nakatsu City
    442038-120715-01 Kakisaka, Yabakei, Nakatsu City
  • 442038-120715-02 Kakisaka, Yabakei, Nakatsu City
    442038-120715-02 Kakisaka, Yabakei, Nakatsu City
  • 442038-120715-03 Kakisaka, Yabakei, Nakatsu City
    442038-120715-03 Kakisaka, Yabakei, Nakatsu City

  • 442046-120715-01 Near Tomoda, Hita City
    442046-120715-01 Near Tomoda, Hita City
  • 442046-120715-02 Near Nishi-arita Hita City
    442046-120715-02 Near Nishi-arita Hita City
  • 442046-120715-03 Near Miwa, Hita City
    442046-120715-03 Near Miwa, Hita City

  • 442089-120715-01 Near Uozumi, Taketa City
    442089-120715-01 Near Uozumi, Taketa City
  • 442089-120715-02 Near Taketa, Taketa City
    442089-120715-02 Near Taketa, Taketa City
  • 442089-120715-03 Near Gotangiri, Taketa City
    442089-120715-03 Near Gotangiri, Taketa City

  • 442089-120715-04 Near Haitabaru, Taketa City
    442089-120715-04 Near Haitabaru, Taketa City

Fukuoka Prefecture

  • 402079-120715-01 Near Takanoo Yamato, Yanagawa City
    402079-120715-01 Near Takanoo Yamato, Yanagawa City
  • 402079-120715-02 Rokugou, Yanagawa City
    402079-120715-02 Rokugou, Yanagawa City
  • 402079-120715-03 Above Yanagawa City
    402079-120715-03 Above Yanagawa City

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Imaging by TerraSAR-X (Synthetic Aperture Radar Satellite)

Image

Specifications

(Currently acquired data)

Date and time : July 13, 2012 at 06:10 (JST)
Imaging Orbit : Descending
Imaging Mode : SpotLight
Polarization : HH
Incidence Angle : 53.42°
Product Type : EEC

(Comparative data)

Date and time : December 2, 2010 at 06:19 (JST)
Imaging Orbit : Descending
Imaging Mode : StripMap
Polarization : HH
Incidence Angle : 41.03°
Product Type : EEC

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

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History of Information Released

1st : 13.Jul.2012
2nd : 17.Jul.2012
3rd : 18.Jul.2012
4th : 19.Jul.2012 10:30(JST)
5th : 19.Jul.2012 18:18(JST)

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]>
*The reuse or copying of images and other information available here without prior permission is strictly prohibited.

[ Copyright ]

The copyright for the documents recorded in the disaster and emergency photos of this page belongs to PASCO CORPORATION.
In addition, the copyrights of the information related to TerraSAR-X and Pleiades on this page belongs to PASCO CORPORATION.
Please contact us for permission to distribute or copy the information (documents and images) recorded in this page.

[ Disclaimer ]

PASCO CORPORATION strived to make the information in this page as accurate as possible at the time of publication; however PASCO CORPORATION does not guarantee integrity or accuracy of the information recorded in this page. PASCO CORPORATION accepts no liability for any loss or damage directly or indirectly, arising from the use of this information or contents. In case the information provided in this page is evidently different from the actual, in order to correct it please contact us.

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