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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE1
Habitat mapping in SwedenStatus update for the “national mapping program”
Gustav Kågesten (SGU), 20th Feb. 2020
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE2
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE3
STATUS AKTIVITET/UPPDRAG UPPLÖSNING BESKRIVNING TILLGÄNGLIGHET
Klar Bratten 2-10 m Bathymetrisk 3D modell,
backscatterHaV/Lst Västra Götaland
Klar Depth model 10 - 25 mBatymetrisk 3D modell för
alla länSjöfartsverket
Klar Västerbottens county 10 mEpibentos, Infauna, Sik, HUB,
NaturvärdenHaV
Klar Bottnian bay 250 mEpibentos, Infauna,
NaturvärdenHaV
Klar Hoburgs bank, Baltic sea 5-10 mHUB, N2000 naturtyper,
Naturvärden och arter.HaV och SGU
Klar Westcoast offshore areas uv-obsDatainsamling inom 5
prioriterade områden HaV, Lst VG
Pågående, klart
sommaren 2019North Midsea bank, Baltic 5 m
HUB, N2000 naturtyper, arter
och habitat(HaV och SGU)
? National substrate model 25 m Version 1.0, includes a new
10m depth model for Sweden(SGU)
Granskning Fish habitat mapping 25 m
Modellering uppväxtområden
på befintlig data, Västkust och
Östkust.
(SLU/HaV)
Permit pending Habitat mapping Baltic sea 250 m
Epibentos, Infauna,
Naturvärden, HUB,
havsplaneområdet Östersjön
(HaV)
”National Marine Mapping program”Who: Project funded by Swedish Agency for Marine and Water Management (SwAM)Participants - SGU, SLU, Swedish Maritime Administration, counties and consultantsWhen: 2016 – 2020What: habitat maps and species models and maps on various scales and resolutionsNext: (Hopfully!) phase two – an integrated program building knowledge from ground up for modelling & mapping in the age of digitalization
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE4
SGUs part so far…
National scale models &Regional scale high resolution mapping
National substrate modelscoastline to EEZ ~165 000 km2
Hoburgs bank and North midsea bank ~2500 km2
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Habitat surveys with Ocean Surveyor16h survey / 8 h sampling routine
EK60 splitbeam sonar
EM2040D multibeamwatercolumn data
EM2040D multibeambackscatter & bathymetry
Sediment profiler
Moving vessel profiles (sv, temp)
High resolution photomosaics & video
Infauna Gilnet fish data
Surface sediment samplesSubsurface sediment samples
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Ground-thruthing with samples and cameras
1m 1 cm
mosaic seafloor coverage ~15 m2
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE7
500 m5 km25 km
High resolution models – Boosted Regression Tree model (R, Caret package)
Sand% cover
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE8
RMSE 4.45 R2 0.26
Mean 3.2%
Model with lower-res depth onlyRMSE 3.73
R2 0.47Mean 4.4%
Model with high-res depth, no backscatter
Biological components: bivalves cover 0-100%RMSE 2.4 R2
0.64Mean 8%
Model with backscatter and high-res depth RMSE 1.88 R2 0.79
Mean 10.8%
Model with substrate model input
substrate components
aspect 20m-2km
terrain 0.5-1m
terrain 5m
bpi 20m-2km
xy
bs mosaic 20m-2km
uncertainty bs/bathy
obia texture
obia shape
fsand eucl dist
depth
reef/bpi eucl dist
terrain 20m-2km
bs ara
bs mosaic statistics
bs mosaic
sand thicknes
0 10 20 30 40 50 60 70 80
VA
RIA
BLE
RELATIVE INFLUENCE (%)
BRT gaussian distribution model - Bivalves % cover
5 km25 km 500 m
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200 m
Special places can be very smallSmall patch reefs of hard clay and boulders -spawning locations for herring on North Midsea bank
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE10
Soft sediments Coarse sediments Hardbottom Blue mussels
National scale models version 1.0 (work in progress)
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE11
Density of substratetrainingdata
NATIONAL SCALE MODELS To make useful maps you need
useful data
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE12
SGUs multiresolution depth model 10m – 250m based on all available datafrom SMA and SGU
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Comparing regional and national habitat modelsQuality/resolution of training data & environmental data is key
There are limits to what we can accomplish with modelling - backscatter data is one of missing pieces
1km 1km
5m model (Hoburgs bank) % cover hardbottomPredicted using with 0.5 m resolution depth & backscatter data
25 m national model - probability hardbottomPredicted using a 10m depth model, and oceanographic models
100%
0 %
high
low
Exampel of largesandy area falselypredicted as hardbottom in thismodel
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GEOLOGI FÖR ETT HÅLLBART SAMHÄLLE14
A closer look at the Bothnian Bay