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REDDeX Conference, Cancun, July 14, 2010 Comparison of REL Methods for Districts of East Kalimantan, Indonesia. Bronson Griscom, Sr. Scientist Forest Carbon John Kerkering, Conservation Analyst
Question: What is the most accurate method for predicting the amount of deforestation within districts of East Kalimantan?
Alternative methods for predicting deforestation (i.e. REL) at sub-national scale Complex Simple Historical Rate (with adjustments) Forward Looking Historical Rate of project area 1 ,[object Object]
Trend analysis.
Rate derived from “reference region.”
Spatially explicit modeling3 “Planned”   (e.g. legal license  to log/convert) 2
1 Predicted deforestation in each district =  Historic rate in each district 2000 2005
2 Predicted deforestation in each district =  Historic rate of reference region  …where reference regions are determined by cluster analysis Cluster Anal.
3 Predicted deforestation in each district =  Modeled future rate in each district  …using spatially explicit model at regional (province) scale.
Here’s how… 3 Prior Deforestation Vulnerability LCM ,[object Object],2000 ,[object Object],“Driver” Variables 2005 Projections 2020 2015 dist. roads dist. converted areas spatial plan soils forest types slope dist. sawmills dist. towns dist. cities topography 2009 Note: projections assume historic rate at province scale dist. navigable rivers
Selection of Model “Drivers” 3
Selection of Model “Drivers” 3
3 Model Performance
Comparison of Three Methods Predicted area deforested from 2006-2009 minus Actual area  deforested from 2006-2009 (as % of actual area deforested) 3 2 1
Comparison of Three Methods 3 2 1
Comparison of Three Methods 3 2 1
Why do cluster reference regions  seem to work? 2
Question: What is the most accurate method for predicting the amount of deforestation within districts of East Kalimantan?

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griscom_rel_e_kali

Editor's Notes

  1. Let’s consider reference region method 2 because:Seems to be relatively accurate.Pretty intuitive (even though some geeky stats).Facilitates nesting to national scale.Might encourage competition to reduce deforestation rates.