Presentation by Christine Rogers, Deltares, at the Data Science Symposium, during Delft Software Days - Edition 2019. Thursday, 14 November 2019, Delft.

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Near real-time monitoring of Dutch
floodplain vegetation
Christine Rogers

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Monitoring River
Floodplain Vegetation
• 500 km
• 12000 land owners
• Where should vegetation
management efforts be
focused to reduce flood
risk?

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Photointerpretation Maps
• Produced every 6 years
Water
Built/paved
Grass/fields
Herbaceous
Forest
Shrubs

4. Water Built/paved Grasslands and fields
Herbaceous vegetation Forest Shrubs
Landcover classes
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Roughness
0 5 10 15 20 25 30
Water
Built/paved
Grass/fields
Herbaceous
Forest
Shrubs
Roughness Value
Water Built/paved Grass/fields Herbaceous Forest Shrubs
Class

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Sentinel-2 data
March 2017

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Classified Maps
Water
Built/paved
Grass/fields
Herbaceous
Forest
Shrubs

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https://vegetatiemonitor.netlify.com/
Water
Built/paved
Grass/fields
Herbaceous
Forest
Shrubs

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Team
Ellis Penning
Project Leader
Gertjan Geerling
Senior Researcher
Valesca Harezlak
Researcher
Gennadii Donchyts
Google Earth Engine,
Full stack
Christine Rogers
Google Earth Engine,
Back end
Robyn Gwee
Google Earth Engine
Cindy van de Vries-Safavi Nic
Front end
Fedor Baart
Front end
Bart Adriaanse
Front end

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Google Earth Engine
https://earthengine.google.com/
• > 600 public datasets
• > 4000 images added
daily
• > 29 petabytes of data
+ 1 PB/month
• Upload your own vector
and raster data
• Tensorflow integration

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Input Data
Landsat 5, 7, 8 (1984-Present) Sentinel-2 (2015-Present)
AHN 0.5m DEM Photo interpretation maps
2013-07-21
2017-08-29
2017-08-29

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Stratified Sampling + Random Forest

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Validation Accuracy
0 Water
1 Built/paved
2 Grass/fields
3 Herbaceous
4 Forest
5 Shrubs
2017 – 86%
PredictedClass
Actual Class

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Water
Built/paved
Grass/fields
Herbaceous
Forest
Shrubs

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Increase
Decrease
Roughness

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Check per owner, download data

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Vegetatiemonitor
• Machine Learning applied to 35
years of satellite data
• Provides accurate measure of
current vegetation
• Assists in discussions with
stakeholders
• Google Earth Engine – many other
possibilities!