利用航拍照片估算面积的最佳点网格密度

IF 1.8 3区农林科学 Q2 FORESTRY

Journal of Forestry Pub Date : 2024-04-10 DOI:10.1093/jof/82.7.428

Lawrence R. Gering, Robert L. Bailey

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引用次数: 0

摘要

通过每平方英寸 4、16 和 49 个点的网格密度测试了从 1:12,000 比例航空照片中估计面积的点计数取样方法。所有三种密度都能得出无偏的估计值。当网点密度大于 27（每网点减少方差的最佳密度）时，假定随机抽样和二项式模型，方差的估算是有效的。变异系数可根据网格的点密度和相关植被类型中点的估计比例进行预测。

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Optimum Dot-Grid Density for Area Estimation with Aerial Photographs

Dot-count sampling to estimate area from 1:12,000 scale aerial photographs was tested with grid densities of 4, 16, and 49 dots per square inch. All three densities gave unbiased estimates. Variances may be validly estimated by assuming random sampling and the binomial model when dot density is greater than 27--the optimum density for per-dot reduction in variance. The coefficient of variation can be predicted from dot density of the grid and estimated proportion of dots in the cover type of interest.

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来源期刊

Journal of Forestry 农林科学-林学

CiteScore

4.90

自引率

8.70%

发文量

审稿时长

>24 weeks

期刊介绍： The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry. The Journal is published bimonthly: January, March, May, July, September, and November.