Upscaling

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Upscaling Strata Accuracy and Recent
Measurements

• P. Bolstad, B. Cook, J. Martin

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Bottom Up Scaling The aggregate is the sum of the
parts What are the parts?
Uncertainty Model logic Parameters State
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Flux S (GPP R) via plant-environment models
Regional landcover (WISCLAND)
new study
our previous
other previous
young
ericacae
mature
alnus
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Alder Fen
Clearcut
Lowland Conifer
Shrub/sphagnum Bog
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Three Upscaling Approaches

• Flux Area Decomposition (WLEF Tall Tower W.
  Wang)
• Canopy Tower Model (regional network of 9 towers
  A. Desai)
• Chamber Scaling (plant/soil measurements and
  models B. Cook)

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Flux Area Decomposition

• Fluxes at the WLEF tower are a weighted average
  of NEE of component types

Weight for ecosystem type i footprint
NEE for ecosystem type i n-total types
Measured flux at height zm and time t
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Flux Area Decomposition
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Evaluating the Aggregation Template
WLEF
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Ecosystem Class Accuracy
142 points, 104 field visited, 28
photo-interpreted
IKONOS WISCLAND MODIS
Ecosystem Class Ac. Upland Conifer
59 Aspen/Birch 88 Upland Hardwood 48 Upland
Shrub 0 Upland Grass 27 Lowland Conifer
54 Lowland Deciduous 18 Lowland Shrub 52 Wet
Meadow 0 Open Water -- Bare/Road -- Mean
Accuracy 71
Ecosystem Class Ac. Upland Conifer 0 Upland
Hardwood 0 Mixed Forest 42 Upland Shrub
0 Grassland 0 Permanent Wetland 0 Mean
Accuracy 28
Ecosystem Class Ac. Upland Conifer
46 Aspen/Birch 69 Upland Hardwood 100 Upland
Shrub 6 Upland Grass 100 Lowland Conifer
60 Lowland Deciduous -- Lowland Shrub 93 Wet
Meadow 0 Open Water -- Bare/Road -- Mean
Accuracy 65
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High Resolution Classification
Low sedge
Clearcut
Alder
Cedar
Cedar
Ash/Elm
Larix
Int. Aspen
Maple/basswood
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Extreme Structural Variability Within Type
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Conclusions

• We dont know much - what does age, species, and
  stocking matter? A multi-classification modeling
  comparison SiB2, Biome-BGC, others?
• 2 sample/sq m dual return lidar structure
• High accuracy photo interpretation

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FINIS