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  2. Girard form class - Wikipedia

    en.wikipedia.org/wiki/Girard_form_class

    Girard form class is a form quotient calculated as the ratio of diameter inside bark at the top of the first 16 foot log to the diameter outside bark at breast height ().Its purpose is to estimate board-foot volume of whole trees from measurement of DBH, estimation of the number of logs, and estimation of the taper of the first log, based on the general relationships identified between the ...

  3. Tree taper - Wikipedia

    en.wikipedia.org/wiki/Tree_taper

    Tree taper is the degree to which a tree's stem or bole decreases in diameter as a function of height above ground. Within Forestry and for the purposes of timber production, trees with a high degree of taper are said to have poor form, while those with low taper have good form. The opposite is the case for open-grown amenity trees.

  4. Tree volume measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_volume_measurement

    Better results can be obtained using subjectively assigned factors to incorporate the taper of the trunk and characterize the basal flare. Trees with major root flare or pronounced taper skew the formula. Extreme root flare produces noticeable overestimates of volume. Conversely, a rapid trunk taper leads to an estimated volume that is too low.

  5. Farm Forestry Toolbox - Wikipedia

    en.wikipedia.org/wiki/Farm_Forestry_Toolbox

    Able to estimate wood volume and log grades in a single tree, a plot of trees or the whole forest. The tool displays information graphically and has import and export data function. Taper models for species from Australia included. Stand Manager: Uses costs and income (actual or predicted) to calculate returns over a rotation.

  6. Window function - Wikipedia

    en.wikipedia.org/wiki/Window_function

    In signal processing and statistics, a window function (also known as an apodization function or tapering function [1]) is a mathematical function that is zero-valued outside of some chosen interval. Typically, window functions are symmetric around the middle of the interval, approach a maximum in the middle, and taper away from the middle.

  7. How to calculate loan payments and costs - AOL

    www.aol.com/finance/calculate-loan-payments...

    You can use a calculator or the simple interest formula for amortizing loans to get the exact difference. For example, a $20,000 loan with a 48-month term at 10 percent APR costs $4,350.

  8. Tapering (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Tapering_(mathematics)

    An example of a linear taper is () = +, and a quadratic taper () = + +. As another example, if the parametric equation of a cube were given by ƒ ( t ) = ( x ( t ), y ( t ), z ( t )), a nonlinear taper could be applied so that the cube's volume slowly decreases (or tapers) as the function moves in the positive z direction.

  9. Multitaper - Wikipedia

    en.wikipedia.org/wiki/Multitaper

    The multitaper method overcomes some of the limitations of non-parametric Fourier analysis.When applying the Fourier transform to extract spectral information from a signal, we assume that each Fourier coefficient is a reliable representation of the amplitude and relative phase of the corresponding component frequency.

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