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Current Distribution of Sagebrush and Associated Vegetation in the Columbia Basin and Southwestern Regions


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A new regional dataset was produced using decision tree classifier and other techniques to model landcover. Multi-season satellite imagery (Landsat ETM+, 1999-2003) and digital elevation model (DEM) derived datasets (e.g. elevation, landform, aspect, etc.) were utilized to derive rule sets for the various landcover classes. Eleven mapping areas, each characterized by similar ecological and spectral characteristics, were modeled independently of one another. An internal validation for modeled classes was performed on a withheld 20% of the sample data to assess model performance. Results of the validation will be presented in the final report and are not available at this time. Mapping area models were mosaicked to create the Columbia [...]


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The digital landcover dataset may be used for various purposes with user's discretion. Specifically, this dataset was created for assessments of shrubland and associated landcover types. These data are not intended to be used at scales larger than 1:100,000.



  • Forest and Rangeland Ecosystem Science Center (FRESC)



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