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    Truth for vegetation cover percent and type is obtained from very large-scale photography (VLSP), stand structure as measured by size classes, and vegetation types from a combination of VLSP and ground sampling. We recommend using the Kappa statistic with bootstrap confidence intervals for overall accuracy, and similarly bootstrap confidence intervals for percent correct for each category and user and producer accuracy. A procedure is given for mapped plots to be assessed as being partially or totally correct. We recommend the use of primary accuracy for management decisions and secondary accuracy for research decisions to distinguish between accuracy desired.

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    Schreuder, H. T.; Bain, S.; Czaplewski, R. C. 2003. Accuracy assessment of percent canopy cover, cover type, and size class. Gen. Tech. Rep. RMRS-GTR-108. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 10 p.


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    valid accuracy assessment, truth, mapped management information, bootstrap errors, partially correct information

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