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    Description

    New sampling methods have recently been introduced that allow estimation of downed coarse woody debris using an angle gauge, or relascope. The theory behind these methods is based on sampling straight pieces of downed coarse woody debris. When pieces deviate from this ideal situation, auxillary methods must be employed. We describe a two-stage procedure where the relascope is used to select pieces of downed coarse woody debris in the first stage. If the pieces so chosen on the first stage have multiple branches and detailed estimates are required for the entire piece, then a second stage sample is advocated using the randomized branch technique. Both techniques are reviewed and an example is given examining possible surrogate variables for the second stage.

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    Citation

    Gove, Jeffrey H.; Ducey, Mark J.; Valentine, Harry T. 2002. Multistage point relascope and randomized branch sampling for downed coarse woody debris estimation. Forest Ecology and Mangement. 155: 153-162.

    Keywords

    angle gauge sampling, inventory methods, probability proportional to size sampling

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https://www.fs.usda.gov/treesearch/pubs/13958