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After the storm comes the pulse

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Flooding Impact Assessment in Cambodia and Timor-Leste

Damage assessment caused by the strong storms that occurred in October 2020 in the Banteay Meanchey province of Cambodia and last April 2021 in the capital of Timor-Leste, at the request of the Asian Development Bank (ADB).

The current decision-making processes rely on expected impacts from models and in situ validations. Slow and costly.

The capabilities of satellite as big source of objective data and the power of artificial intelligence to make easy and quick quantifications over it are key elements to take action when natural disasters happen.

Can we quantify the number of affected households? Where are the disrupted roads? Are the key social infrastructures such as hospitals and schools still accessible? To which extent are crops destroyed? How long is the recovery taking?

Water extent mapping

First, the extension of the water was evaluated by generating flood masks, using neural networks over optical and radar satellite images.

Optical EO Optical EO Image
Flooding mask Flooding mask
Radar EO Radar EO Image
Flooding mask Flooding mask

Asset mapping

The crop mapping was generated by using our DL algorithms:

EO image EO Image
NN crop model NN Crop model

Other data such as population data, roads, infrastructures, health center´s location, etc. was gathered from Open Data sources.

Population Population
Roads Roads

Analysis, Impact quantification & evolution

The impact on key assets was then assessed by applying classification and segmentation models, based in our NN models.

Quantifying destroyed crops, damaged infrastructure such as roads, educational or health centers and affected people is key for impact assessment and also for recovery operations.

Affected crops, Cambodia

Affected crops image

Affected crops graphic

Affected schools, Cambodia

Affected schools image

Affected schools graphic

Affected population, Cambodia

Affected population image

Affected population graphic

Affected roads, Timor-Leste

Affected roads image

Keeping an eye as well to its evolution throughout the following days and months provide us the information regarding the recovery of each particular asset.

General affectation graphic

Key figures

Quantified impacts in Banteay Meanchey:

  • 47%

    of crops affected

  • 107

    schools affected

  • 23,858

    students affected

  • 3

    health centers affected

  • 71

    roads affected

  • 21,471

    people displaced

  • 4,476

    households displaced

  • 105,656

    people affected

Dashboard Cambodia – summary of damage location and quantification.

Dashboard Cambodia – summary of damage location and quantification.

Data obtained with

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Impact Pulse

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