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Flood Mapping and Monitoringexploiting

ESA and Third party missions

Dr Hervé YESOU

Hanoi, Monday 25 of February 2008

SERTIT, Bv Sébastien Brant, BP10413, 67412 Illkirch, France

herve@sertit.u-strasbg.fr, http://sertit.u-strasbg.fr

Presentation outline

1. Who we are ?

2. Why flood mapping and monitoring

3. Example of EO (SAR) exploitation on flood mapping

4. Concluding remarks and recommendations

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Specialised Service within Strasbourg University

Valorisation andtechnological transfertin space techniquesand E.O. applications

Professional team15 multi-disciplinary specialists

+ High level students

Specialized up-to-date equipmentsSurrounding research laboratories

SERTIT

SERTIT’s activities

Activities– Image processing– Remote Sensing– GIS- Training

-Applications– Land management and

urban planning– Natural resources

monitoring– Environmental survey– Natural disaster and risk

management

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Paris Strasbourg

ToulouseESA ESRIN

Rome

Munich

ESA ESTEC

Flood mapping and monitoring based on EO data

• SERTIT gained experience from

– ESA Programmes• AO and CAT1 ERS• EOMD Plain flood project (K. Fellah)• Water an Fire project• GMES- ESA GSE projects (Riskeos, Respond)• DRAGON flood project (Pr Li Jiren, Dr Huang Sh., R. Andreoli)

– CNES projects• SPOT2 to SPOT5 preparatory and validation programmes• Pactes , RTE Ministry Research and Education programme• Pléiades / Orfeo thematic programme

– International Charter Space and Major Disasters:near 30 actions of flood rapid mapping

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SERTIT: Rapid Maping service

SERTIT: Rapid Maping service• Service vocation: producing and broadcasting geographic information

covering disasters

• Type of events: designed at the beginning to floods mapping and monitoring , extent to earthquake, volcano, forest fire, technical accident

• Sources: all Earth Observation Satellites (ENVISAT, Spot 5, IRS ...)

• Where: worldwide

• When: operational 24 hours a day, 365 days a year

• Delivery delay: 12 hours after satellite acquisition

• For who: civil defence agencies, humanitarian community,insurance and reinsurance companies …

SERVICE integrated in ESA GSE and EU GMES Programmes

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• Rwanda Earthquake Feb 2008• GNEX 07 October 2007• Greece forest fire Sept 2007• Madagascar flooding March 2007• Euromed exercise MED 2007 March 2007• Mozambique flooding February 2007• Moselle flooding October 2006• Gnex experience October 2006• RMA Forest fire Greece August 2006• Suriname Flooding May 2006• Inondations Europe Centrale April 2006• Algeria earthquake March 2006• Feux Nouvelle Calédonnie January 2006• Pakistan earthquake October 2005 (ESA)• Floods in Gard, France Sept. 2005 (CNES)• Katrina hurricane, USA August 2005 (CNES)• Floods in Senegal August 2005 (CNES)• Floods in Romania July 2005 (CNES)• Forest fire in SE France July 2005 (CNES)• Floods in China June 2005 (UN)• Floods Bulgaria June 2005 (UE)• EURATECH, France April 2005 (CNES)• Zarand, Iran February 2005 (CE)• Roratongo (cyclone), Cook island January 2005 (CNES)• Tsunami SE Asia December 2004 (CNES)• Floods Philippines December 2004 (UN)• Floods in Haiti, September 2004 (UN) • Floods & humanitarian in Darfur, August 2004 (UN)• Floods in Haiti, June 2004 (UN)• Floods in Namibia, April 2004 (UN)• Earthquake Al Hoceina, Morocco February 2004 (UN)• Earthquake in Bam, Iran, December 2003 (ESA)• South France Flooding, December 2003 (CNES)• Philippines Flooding, December 2003 (UN)• Dominican Republic Flooding, December 2003 (UN)• Boumerdes Earthquake, Algeria, May 2003 (CNES)• Bingol Earthquake, Turkey, May 2003 (ESA)• Stromboli Eruption , Italy, April 2003 (ESA)• Gard Flooding, France, September 2002 (CNES)• Elbe Flooding, Germany, August 2002 (ESA)• Nyiragongo Lava Flow, Congo, January 2002 (CNES)• Meuse Flooding, France, January 2002 (ESA)• Saône Flooding, March 2001 (ESA) • San Salvador Earthquake, 2001 (CNES)

40 Charter actions

+

Regional actions

& demonstrators

SERTIT added value actions in NRT

Sertit: value added provider for the Charter

Support technique pour les actions » Charte » gérées Support technique pour les actions » Charte » gérées par le CNES pour la période 2004par le CNES pour la période 2004--20062006

Nyiragongo, Congo

SE, France

Elbe, GermanyNE FranceSaône, France

Indonesia

El Salvador

StromboliBingol,Turkey

BoumerdesAlgeria

DominicanRepublic

Philippines

Bam,Iran

Al HoceimaMaroc

Zambese Namibia

Gard, France

Darfour, Soudan

RarotongaIles Cook

Zarand,Iran

Sumatra, Indonesie

Sri Lanka

Haïti

Bulgaria

Guangxi, Gaungdong, China

Romania

Var, France

Muzaffarabad

Nouvelle Orléans

Nouvelle Calédonie

Suriname

Sénégal

Mozambique Madagascar

Rwanda

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Why it is relevant to map and monitor flood events?

• Floods: 34% world natural hazards between 1974-2003

• Near 200 millions of affected people each year (more than half of affected people by a natural hazards)

• More than 170 000 deceases from 1980 to 2000

• With climate change it would become worse

• Fitting floods is one of the most important environmental challenge

Source:EM-DAT - International Disaster Database

• Floods: worldwide

• Important mortality in Asia, Central- South America, Eastern Africa

• Important economic losses in Europe, Northern America as well as Asia

Global Distribution of Flood Risk (Source: Columbia University, UNDP, CRED)

Why it is relevant to map and monitor flood events?

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Why SAR is a performing tool for flood mapping ?

From Sarti, 2004

All weather capability

Day & night capabilities

Relative large swath

Relative good revisite

On SAR data water surfaces have low values of BS

But local weather (wind/rain) effect altering the signal

Since ERS 1 launch, 1991, followed by ERS 2 in 1995, SAR data have been wordily exploited for flood mapping

(cf numerous papers on ESA conferences)

• Thames flood 1992• Camargue flood in 1993• Meuse flood 1993-1994• Aude flood 1996• Oder flood in 1997 • Chinese flood in 1998• and many more…

• Exploiting mostly the Amplitude

Flood mapping basedon ERS 1 - 2

ERS Mosaïque over the Oder river : Acquired 30-07 to 9-08-97

100 km

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ERS: experimental 3 days mode from winter 93 to spring 94Map of water permanency during the Meuse flood draw off in spring 1994(Yésou et Chastanet, 2000)

Flood mapping based on ERS 1 - 2

ASAR ENVISAT: flood mappingASAR ENVISAT: flood mapping

ASAR ENVISAT good successor of ERS with improvements:

1 – Better water recognition potential

• HH mode >> HH-HV >>>>> VV

2- Better revisit thanks to:

• Multi beams

• Wide Swath mode

3 – Flooded low vegetation recognition

Also in some favourable cases, possibility of identification of flooded forest thanks to double-bounce phenomenon

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ENVISAT: flood ENVISAT: flood rapidrapid mappingmapping

15 km

Elbe 2002

Why SAR is a performing tool for flood mapping ?

Extract of a ENVISAT WSM stripe

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Huaihe River

July 2007

NRT Flood DRAGON

WSM from RA

Courtesy ofIWHR, Beijing

ENVISAT: flood ENVISAT: flood rapidrapid mappingmapping

MERIS presents:

1 – Good spatial resolution with 300m (cf MODIS)

2 – Additional application such as Suspended Matter content

3 – Large swath: stripe 1300 km (image of 500 km )

4 –Convenient revisiting time

5 – Rapid availability through ESA Rolling archives facilities

=> Great potential therefore only a few MERIS exploitations for flood mapping

MERIS FR: a forget tool for flood mappingMERIS FR: a forget tool for flood mapping

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Central Europeanflood Spring 2006

March 2006

MERIS FR: a forget tool for flood mappingMERIS FR: a forget tool for flood mapping

Bucarest

Bulgaria

Romania

Danube

Vietnam floods

November 2007

Bucarest

Romania

MERIS FR: MERIS FR: a forget tool fora forget tool for

flood mappingflood mapping

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Vietnam floods

November 2007

Bucarest

Romania

Complementarily SAR and Optical

Complementarily in terms:

• Information content

• Information access

• Data availability

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January 2004: 1000 km2

August 2004: 4000 km2

Poyang Lake, RP ChinaASAR & MERIS synergy for long term monitoringASAR & MERIS synergy for long term monitoring

Poyang Lake, RP China

The variation of Poyang Lake's surface derived from ENVISAT data and according to the season is coherent

ASAR & MERIS synergy for long term monitoringASAR & MERIS synergy for long term monitoring

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Merci

Thank you