首页> 外文期刊>Statistical Methods and Applications >Variance predictors for isotropic geometric sampling, with applications in forestry
【24h】

Variance predictors for isotropic geometric sampling, with applications in forestry

机译:各向同性几何采样的方差预测因子,在林业中的应用

获取原文
获取原文并翻译 | 示例
           

摘要

A coherent set of explicit approximations is presented for the variance of planar area and volume estimators obtained under systematic geometric sampling. For planar objects (e.g. a land plot, or a tissue section), sampling is considered with test systems of points, lines, segments, stripes, or quadrats. For three dimensional objects analogous probes are considered. For the formulae to apply the design has to be uniform random (which suffices to estimate planar area or volume only) and also isotropic. The formulae are based on G. Matheron's transitive theory. A synthetic example on the estimation of canopy cover is explained in detail.
机译:对于在系统几何采样下获得的平面面积和体积估计量的方差,给出了一组连贯的显式逼近。对于平面物体(例如,土地图或组织切片),应考虑使用点,线,线段,条纹或四边形的测试系统进行采样。对于三维物体,应考虑类似的探头。对于要应用的公式,设计必须是均匀随机的(仅足以估计平面面积或体积)且各向同性。这些公式基于G. Matheron的及物理论。详细说明了树冠覆盖率估算的综合示例。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号