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Sampling size within grid cell for field map of solid parameter

机译:实体参数场图的网格单元内的采样大小

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This paper discusses how many data should be collected for representing the feature over one grid space. Two test areas 4.2 meter square with 0.6 m sub-grid spacing in a maize growing field, and 10 meter square with 1 m sub-grid spacing in a paddy field after harvesting. NO{sub}3-N as soil parameter was collected in respective sub-grid spacings. Data obtained provided non-normal distribution for the maize field and normal distribution for the paddy field. With the data sets, sampling size andestimation error was evaluated in terms of average. Results showed that in the maize field sample averages could be estimated using normal distribution techniques, and that estimation errors were greater in the maize field than in the paddy field.Estimation errors increased with depth for the maize field, but for the paddy field the effect of depth was not significant. In the maize field, keeping the estimation error below 20% required at least 10 points of sampling size.
机译:本文讨论了应收集多少数据来表示一个网格空间上的要素。玉米种植区的两个试验区面积为4.2米见方,子网格间距为0.6 m,收获后在水田中的两个试验区中,子网格间距为1 m。在各个子网格间距中收集了作为土壤参数的NO {sub} 3-N。获得的数据为玉米田提供了非正态分布,为稻田提供了正态分布。利用这些数据集,以平均值评估了抽样规模和估计误差。结果表明,在玉米田中,可以使用正态分布技术估算样本平均值,并且玉米田的估算误差比稻田大。深度并不重要。在玉米田中,将估计误差保持在20%以下需要至少10个采样点。

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