Cumulative Impact Estimation for Landscape Scale Forest Planning

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Cumulative Impact Estimation for Landscape Scale
Forest Planning

• Finn Krogstad Peter Schiess
• U. Washington, Forest Resources

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Cumulative Impact
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Overview

• Polygon vs. Grid
• Grid new tool or paradigm shift
• Spatial Calculus

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Spatial Hydrology
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Polygon Dataglorified mylar
vegetation(x,y)
y
topography(x,y)
x
soils(x,y)
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Non-Spatial Hydrologyrainfall-runoff black boxes
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Polygon Hydrologysumming black boxes
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Polygon Blocksmultitudinous approximation
Distance from stream
Aspect
Elevation
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Polygon vs. Gridreducing polygon size
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Grid Hydrologysumming point processes
P
ET
R
I
?S
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Gridding the Universe

• Grid makes the polygons small
• More general that polygons or points
• Topography (slope, aspect, etc.)
• Raster data (precipitation, vegetation)
• Grid stacks and grid algebra
• Focus on point processes (Fma)

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New Tool or Paradigm Shift

• Just a New Tool
• New tools always come along
• Wont Grid be replaced in turn?
• Paradigm Shift
• General problem solving approach
• Focus on physical processes not solution

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Analogy Calculus-based Physics

• You can teach non-calculus physics
• case specific and clever solutions
• Learning calculus allows
• general situations and direct solution

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Grid Calculusexisting hydrologic algorithms

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FLOWACCUMULATIONintegrating contributing area

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FLOWLENGTHintegrating down flow path

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Conclusion

• Grid for experts Polygon for others
• Teach physical process, not solutions
• Other fields (ecology, forestry, etc.)