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Upscaling – Strata Accuracy and Recent Measurements

Upscaling – Strata Accuracy and Recent Measurements. P. Bolstad, B. Cook, J. Martin. Bottom Up Scaling The aggregate is the sum of the parts What are the parts?. Uncertainty Model logic Parameters State. Flux = S (GPP – R) via plant-environment models. Regional landcover (WISCLAND).

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Upscaling – Strata Accuracy and Recent Measurements

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  1. Upscaling – Strata Accuracy and Recent Measurements P. Bolstad, B. Cook, J. Martin

  2. Bottom Up Scaling The aggregate is the sum of the parts What are the parts? Uncertainty Model logic Parameters State

  3. Flux = S (GPP – R) via plant-environment models Regional landcover (WISCLAND) new study our previous other previous young ericacae mature alnus

  4. Alder Fen Clearcut Lowland Conifer Shrub/sphagnum Bog

  5. 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)

  6. 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

  7. Flux Area Decomposition

  8. Evaluating the Aggregation Template WLEF

  9. 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%

  10. High Resolution Classification Low sedge Clearcut Alder Cedar Cedar Ash/Elm Larix Int. Aspen Maple/basswood

  11. Extreme Structural Variability Within Type

  12. Conclusions We don’t 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

  13. FINIS

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