by: tran tuan ngoc vietnam national remote sensing centre
TRANSCRIPT
By: Tran Tuan NgocVietnam National Remote Sensing Centre
CONTENTS
1.
Flood in Vietnam 2.
Sentinel Asia activation for flood
observation in Vietnam3.
Conclusions and recommendations
FLOODING IN VIETNAM
Vietnam is one of the countries in the world that severely suffered from typhoon;Every year, there are about 10 typhoons coming to Vietnam;Central of Vietnam is the most effected region by typhoon.In 2009, this area is continuously suffered by two strong typhoons, Ketsana, and Mirinae, which caused huge destruction.
KETSANA TYPHOON IN SEPTEMBER 2009It struck Centre of Vietnam on 29th September 2009Number dead: 163.Number injured: 616.Number of houses collapsed: 21,429.Number of houses with broken roofs: 268,000.Schools damaged: 5,280.Agricultural damage: 35,000 hectares rice paddies,12,000 hectares sugar cane; 3,700 hectares of aquaculture inundated.
MIRINEA TYPHOON IN NOVEMBER 2009Tropical storm Mirinae caused widespread damage in central provinces when it struck centre of Vietnam on 2nd, Nov 2009.Deaths caused: 122.Injured: 145Houses collapsed: 2198Rice paddies flooded: 19,272 haFish and shrimp ponds damaged: 1987 haBoat sunk: 337Total estimated damage: 278,658,000 USD
Pictures of flood
Pictures of flood
Pictures of flood
SENTINEL ASIA ACTIVATION FOR KETSANA TYPHOON OBSERVATION
Emergency observation request was submitted to Sentinel Asia on 29th, September 2009 by VNRSCResponse was almost immediately as an ALOS PALSAR image in fine mode on 30th, September 2009 were acquired.
Image foot print
Rapid Map Making work flow
Flood map Flood map over Quang Binh Province
Flood map over Quang Binh Province
SENTINEL ASIA ACTIVATION FOR MIRINAE TYPHOON
Emergency observation request has been ordered on 3rd, Nov 2009 through ADRC.Response has been made almost immediately ALOS PALSAR in fine modes on 5th,Nov 2009 were provided.Reference data: from 1st, Dec 2008 and 3rd, Mar 2009.
ALOS PALSAR coverage
1st, Dec 2008
3rd, Mar 2009
5th, Nov 2009
Data AnalysisData from 1st, Dec 2008, 3rd, Mar 2009 and 5th Nov 2009 were used for flood analysisClassification of flooded area from 5th, Nov 2009.Making Rapid map
RGB Composed
R: 5th, Nov 2009G: 1st, Dec 2008B: 3rd, Mar 2009
Flood map in Binh
Dinh
province
Flood Rapid map in Binh
Dinh
province
Flood Rapid map in Phu
Yen province
Flood Rapid map in Phu
Yen province
DAM building
Forest lost in Binh dinh province
Forest lost in Phu Yen province
CONCLUSIONSSentinel Asia responses well to observe the disaster. Normally, only two or three days after activation ,the satellite image acquisition is made;The ALOS PALSAR data provided before and during flood is useful for inundation mapping.Flood map is useful for understanding overall disaster situation;
RECOMENDATIONS1.
Scan SAR mode is enough for flood map making.
Recommendations2.
To react to the disaster in time, the predicting
information should be used. For example, incase of typhoon we can you the meteology
information to activate the Sentinel sooner in order to get the images over the effected areas in
time;3.
Technical matter such as low data transfer rate
is the hinder for delivering data and disaster map to the end‐users as the EO data always has
large size, and it may be difficult to transfer through the Internet. Hopefully the exploitation
of WNDS stations can overcome this problem.