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Emergency Observation of heavy rain at Amami Oshima in Japan by AVNIR-2 onboard "Daichi" (ALOS) (2)

Whole area of Amami Oshima was seriously damaged due to floods and mudslide caused by heavy rain which had occurred since October 20, 2010. The Japan Aerospace Exploration Agency (JAXA) has performed the emergency observation to monitor the state of the damage by the Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2)* onboard the Advanced Land Observing Satellite (ALOS, "Daichi") at 10:41 (JST) or 1:41 (UTC) on October 30, 2010. The images by AVNIR-2 taken on October 22, 23 and 24, 2010 could not be seen by many clouds.

Fig. 1 shows an observed image and is color assigned band 3, 2 and 1 of AVNIR-2 as the true color composite. White colored areas show cloud. The areas of landslide disaster were identified by the image taken on October 30, 2010 through the clouds.

Fig.1: AVNIR-2 image with 41.5 degrees pointing angle acquired at 10:41 on October 30, 2010 (JST). Yellow squares show location of Figs. 2 to 4.

Fig.1: AVNIR-2 image with 41.5 degrees pointing angle acquired at 10:41 on October 30, 2010 (JST).
Yellow squares show location of Figs. 2 to 4.

(Click to View Enlarged Image)

Both Figs.2 and 3 shows enlarged image at Akina in Tatsugo-cho. The yellow circles in the image (Fig. 2) taken on October 25, 2010 seemed mudslide area. The image taken on October 30, 2010 shows one of the disaster areas.
The yellow and red circles in the image (Fig. 3) taken on October 25 and October 30, 2010 seemed to mudslide disaster. Red circle shows that landslide entered Route 58.

Fig.2: Enlarged images at Akina in Tatsugo-cho (25 square kilometers, left: October 30, 2010; middle: October 25, 2010; right: September 14, 2010).

Fig.2: Enlarged images at Akina in Tatsugo-cho
(25 square kilometers, left: October 30, 2010; middle: October 25, 2010; right: September 14, 2010).

(Click to View Enlarged Image)

Fig.3: Enlarged images at town office in Tatsugo-cho (25 square kilometers, left: October 30, 2010; middle: October 25, 2010; right: September 14, 2010).

Fig.3: Enlarged images at town office in Tatsugo-cho
(25 square kilometers, left: October 30, 2010; middle: October 25, 2010; right: September 14, 2010).

(Click to View Enlarged Image)

Fig.4: Enlarged images at Sumiyou-cho (25 square kilometers, left: October 30, 2010; right: January 18, 2010).

Fig.4: Enlarged images at Sumiyou-cho
(25 square kilometers, left: October 30, 2010; right: January 18, 2010).

(Click to View Enlarged Image)

The acquired images were provided to Cabinet Office and Cabinet Secretariat.

* Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2):
AVNIR-2 is a visible and near infrared radiometer for observing land and coastal zones.
It provides 10-m spatial-resolution image and 70-km swath on the ground. The pointing angle of AVNIR-2 is +44 and - 44 degrees. This image was acquired by 41.5 degrees east.
The images taken on October 25 and 30, 2010 were acquired by 44.0 degrees east and 41.5 degrees east, respectively. The images taken before disaster on January 18, 2010 and September 14, 2010 were acquired by 0.0 degree and 41.5 degrees east, respectively.

©JAXA EORC

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