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KIT – The Research University in the Helmholtz Association
Institute for Geography and Geoecology (ifgg)
www.kit.edu
Mapping of invasive plant species with Sentinel-1
and -2 data calibrated with UAV-based training data
Teja Kattenborn, Javier Lopatin, Michael Förster, Fabian Fassnacht
Institute for Geography and Geoecology (ifgg)2
Rationale
Invasive plant species can pose major threats to
biodiversity, ecosystem functioning and services
Sentinel-1 (SAR) and Sentinel-2 (Multispectral)
satellite data have unpreceded spatial and
temporal resolution with global coverage
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Early, R. et al. (2016), Nature Communications
Sentinel-1(SAR) Sentinel-2 (Multispectral)
Institute for Geography and Geoecology (ifgg)3
Rationale
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
UAV photogrammetry Sentinel data
Field sampling is
expensive and
time consuming
Field sampling is
often biased by
accessibility
Linking discrete field samples
to the remote sensing scale
is challenging
Field samples often do
no match the ‘bird
perspective’
Visual interpretation
Institute for Geography and Geoecology (ifgg)4 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Study site
Pinus radiata Acacia dealbata Ulex europaeus
RGB camera
Canon 100D
Hyperspectral camera
(Gamaya-Oxi, 400-900nm)
Institute for Geography and Geoecology (ifgg)5 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Visual
interpretation of
UAV products
Automatic classification
(MaxEnt) using UAV–
based predictors
Upscaling from UAV
(0.1m) to the Sentinel
scale (10m) by
random forest
Proposed workflow
Digitial Elevation Model
RGB
RGB
Texture (2D)
Structure (3D)
Hyperspectral 400-900nm
Sentinel-2 (multispectral)
Sentinel-1 (SAR)
Institute for Geography and Geoecology (ifgg)6 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
UAV-based classification
Pinus radiata Acacia dealbata Ulex europaeus
Institute for Geography and Geoecology (ifgg)7 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
UAV-based classification
Manmade
objects
Native
shrubs
Institute for Geography and Geoecology (ifgg)8 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
UAV to Sentinel – Pinus radiata
Native
Broadleaf
evergreen
forest
Pinus
radiata
Native beech
forest
Institute for Geography and Geoecology (ifgg)9
UAV to Sentinel – Acacia dealbata
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Predicted likelihood / cover fraction
Institute for Geography and Geoecology (ifgg)10
UAV to Sentinel – Ulex europaeus
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Predicted likelihood / cover fraction
Institute for Geography and Geoecology (ifgg)11
UAV to Sentinel – Pinus radiata
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Predicted likelihood / cover fraction
Institute for Geography and Geoecology (ifgg)12 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
UAV to Sentinel – statistical summary
Variable importance Sentinel-1: 8-16%
Variable importance Sentinel-2: 84-92 %
Institute for Geography and Geoecology (ifgg)13
Conclusions & Outlook
Invasive species can be quite accurately mapped using
UAVs when combining different predicors
UAV-based estimates can be accurately up-scaled to the
Sentinel scale
→Promising alternative to traditional field sampling!
Sentinel-2 (Multispectral) was more important than Sentinel-
1 (SAR) for up-scaling species cover
Workflow is transferable to other sensors and endmembers
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Sentinel-2 Sentinel-1
>
Landsat?Biodiversity assessments?
Tree species classifcation?
Habitat mapping?
Institute for Geography and Geoecology (ifgg)14
Thank you for your attention!
Institute for Geography and Geoecology (IFGG),
Karlsruher Institute of Technology
21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
Thank you for your attention!
Institute for Geography and Geoecology (IFGG)
Karlsruher Institute for Technology (KIT)
Institute for Geography and Geoecology (ifgg)15 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
UAV to Sentinel – Pinus radiata
Institute for Geography and Geoecology (ifgg)16 21.12.2018 Teja Kattenborn - Mapping of invasive plant species with Sentinel-1 and -2 data calibrated with UAV-based training data
