Accuracy and Precision of Selected Stream Habitat Estimates
Accuracy and Precision of Selected Stream Habitat Estimates
复制标题
所选河流栖息地估计的准确性和精确度
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Lyons
中科院分区：
文献类型：
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作者：
Lizhu Wang;T. Simonson;J. Lyons
摘要在威斯康星州南部的三条溪流中，对溪流生境变量估计的精度和准确性进行了评价。观察员间精密度由具有三种不同经验水平的六名观察员估计。27流栖息地变量的估计精度一般是好的，46%的置信区间的整体平均值为6个观察员小于或等于实地测量精度。流的宽度和水深估计最精确，其次是基板组成，覆盖鱼类，和银行易受侵蚀。银行植被或土地利用和砾石嵌入的估计是最不精确的。我们通过比较来自相同六名观察员的直接目视观察结果与从相同基底区域的数字化照片获得的值来确定定量基底组成的准确度。结果表明，73%的目视估计的基底值和数字化值之间的差异小于...
Abstract The precision and accuracy of estimates of stream habitat variables were evaluated in three southern Wisconsin streams. Among-observer precision was estimated from six observers with three different levels of experience. The precision of estimates for 27 stream habitat variables was generally good; 46% of the confidence intervals of the overall means for six observers were less than or equal to the field measurement precision. Stream width and water depth were estimated most precisely; these were followed by substrate composition, cover for fish, and bank susceptibility to erosion. Estimates of bank vegetation or land use and gravel embeddedness were the least precise. We determined accuracy of quantifying substrate composition by comparing direct visual observations from the same six observers with values obtained from digitized photographs of the same area of substrate. The results showed that 73% of the differences between visually estimated substrate values and digitized values were less than...