2019-08-28 Northern Kyushu flood due to heavy rain once every decade, in August

Emergency Obs. Request Information

  • Disaster Type: Flood
  • Country: Japan
  • Occurrence Date (UTC): 2019-08-28
  • SA activation Date(UTC): 2019-08-28
  • Requester: National Research Institute for Earth Science and Disaster Resilience (NIED)
  • Escalation to the International Charter: Yes
  • GLIDE Number:

Disaster Situation

Torrential rain hit southwestern Japan on August 28 Wednesday morning, prompting local governments to instruct thousands of people to evacuate as rivers overflowed in what the weather agency called an 'unprecedented downpour' that left at least two people dead. In Saga Prefecture in the Kyushu region, JR Saga Station was flooded and a number of vehicles were seen submerged, while landslides were confirmed in the city of Takeo and rivers in Ogi and Imari overflowed, flooding nearby farm fields.
https://www.japantimes.co.jp/news/2019/08/28/national/special-landslide-flood-warnings-issued-downpours-hit-western-japan/#.XWdlcCgzYuU (from ©Japan Times)

Satellite Image

 Before Disaster

 ALOS-2 (Jpeg) 

クリックで拡大
2019-08-27

ALOS-2 PALSAR-2, P131F650, A, 35.4,
27 Aug., 2019

クリックで拡大
2019-08-27

ALOS-2 PALSAR-2, P131F660, A, 35.4, 27,
27 Aug., 2019

クリックで拡大
2019-06-04

ALOS-2 PALSAR-2, P131F650, A, 35.4,
4 June, 2019

クリックで拡大
2019-06-04

ALOS-2 PALSAR-2, P131F660, A, 35.4,
4 June, 2019

クリックで拡大
2017-12-07

L2.1 ALOS-2 PALSAR-2, P123F700, A, 48,
3 Jan., 2019

クリックで拡大
2017-12-07

L2.1 ALOS-2 PALSAR-2, P123F710, A, 48,
7 Dec., 2017

クリックで拡大
2015-03-18

ALOS-2 PALSAR-2, P22F2960, D, 44.7,
18 Mar, 2015

クリックで拡大
2015-03-18

ALOS-2 PALSAR-2, P22F2950,D, 44.7,
18 Mar, 2015

 After Disaster

 ALOS-2 (Jpeg) 

クリックで拡大
2019-08-29

L2.1 ALOS-2 PALSAR-2, P123F700, A, 48,
29 Aug., 2019

クリックで拡大
2019-08-29

L2.1 ALOS-2 PALSAR-2, P123F710, A, 48,
29 Aug., 2019

クリックで拡大
2019-08-28

ALOS-2 PALSAR-2, P22F2960, D, 44.3,
28 Aug., 2019

クリックで拡大
2019-08-28

ALOS-2 PALSAR-2, P22F2960, D, 44.3,
28 Aug., 2019

 IRS (Jpeg) 

クリックで拡大
2019-08-30

Resourcesat-2 AWiFS data as observed on Aug 30,2019

Product

 Product-AIT (Jpeg) 

Flooding in Saga Prefecture, Japan
2019-08-29

Flooding in Saga Prefecture, Japan

This map shows possible massive flooding areas from heavy rain on 28 August 2019, which has affected in Saga prefecture, Japan. Note that detected water may also include water in paddy area.

 Product-AIT (Shapefile) 

Flooding in Saga Prefecture, Japan
2019-08-29

This file includes the shape file of the Detected Flood Area.

 Product-JPYU (Jpeg) 

クリックで拡大
2019-08-30

Oil leaking and flooding Area, observed by KOMPSAT-5, Saga, Japan supported by International Disaster Charter

クリックで拡大
2019-08-30

Detection of water areas detected by ALOS-2 in Saga Prefecture, Japan

クリックで拡大
2019-08-30

Detection of water areas detected by ALOS-2 in Saga Prefecture, Japan

 Product-JPYU (Tiff) 

Detected Water Area uging ALOS-2 in Saga, Japan
2019-08-30

Detected Water Area uging ALOS-2 in Saga, Japan

 Product-EOS (Jpeg) 

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods v0.5 (Main)
2019-08-30

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods v0.5 (Main)

This map shows areas that are likely flooded in southwestern Japan due to heavy rains, shown by light blue pixels of 2.5 m pixel size, and is a preliminary result. The map extents are indicated with yellow and red polygons. This map should be used as a guidance to identify areas that are likely flooded, and is less reliable over urban and vegetated areas. Derived from synthetic aperture radar data acquired by the ALOS-2 satellites operated by the Japan Aerospace Exploration Agency (JAXA) before (18 Mar 2015 - yellow, 4 Jun 2019 - red) and during (28 Aug 2019 - yellow, 27 Aug 2019 - red) the event. Data were provided by Sentinel Asia. Analysed by the ARIA-SG team at the Earth Observatory of Singapore (EOS) in collaboration with NASA/JPL and Caltech.

 Product-EOS (Data) 

ARIA-SG Flood Proxy Map: Myanmar, 2019 Floods v2.0 (Shapefile)
2019-08-30

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods    v0.5 (Shapefile - P131)

AARIA-SG Flood Proxy Map: Myanmar, 2019 Floods v1.0 (Shapefile)
2019-08-30

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods    v0.5 (Shapefile - P22)

ARIA-SG Flood Proxy Map: Myanmar, 2019 Floods v2.0 (Shapefile)
2019-08-30

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods    v0.5 (GeoTiff - P131)

ARIA-SG Flood Proxy Map: Myanmar, 2019 Floods v2.0 (Shapefile)
2019-08-30

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods    v0.5 (GeoTiff - P22)

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods v0.5 (KMZ)
2019-08-30

ARIA-SG Preliminary Flood Proxy Map: Japan, 2019 Floods    v0.5 (KMZ)

 Product-RIKEN (Jpeg) 

Preliminary Flood Mapping Following Torrential Rain in Saga, Japan
2019-08-29

Preliminary Flood Mapping Following Torrential Rain in Saga, Japan

Torrential rain hit Saga Prefecture, Japan, triggering floods and landslides. The Geoinformatics Unit, RIKEN Center for Advanced Intelligence Project conducted a preliminary mapping of the affected areas using earth observation data. The Sentinal Asia Program provided ALOS-2 PALSAR-2 data used in this analysis.
To detect the flooded areas, we carried out a change detection analysis using a pre-event SAR data acquired on March 18, 2015, and a post-event SAR data from August 28, 2019. The image shows the comparison of the color composite of ALOS-2 PALSAR-2 images and the detected flooded areas (blue segments) around Omachi, Saga.

Web GIS

  • Flood in Kyushu, August 2019
    ALOS2_RGB_28Aug2019 
    see detail

  • Flood in Kyushu, August 2019
  • “Inundation area extraction results”

    The blue polygons in the image are the assumed inundation area extracted from the ALOS-2 image. The result of RGB color synthesis analysis results obtained after interpretation by SAR image specialists.
    Since flat objects such as building roofs, grounds, roads, and bare ground appear as dark as water areas, even if they are not flooded, they may be interpreted as expected flood areas. Also, in the case of densely populated residential areas, reflection from the building is strong (it is brighter than the water area).