Monitoring of Plant Coverage of Plots by VisualEstimation and Overhead Photograph

ZHANG Wen-bo; LIU Bao-yuan; WU Jing-dong

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Monitoring of Plant Coverage of Plots by VisualEstimation and Overhead Photograph

- Monitoring of Plant Coverage of Plots by VisualEstimation and Overhead Photograph
- Bulletin of Soiland Water Conservation Vol. 20, Issue 6, Pages: 60-63(2001)
- 作者机构：
  
  1. 北京师范大学资源与环境科学系,北京,100875
  2. 北京市水利局,北京,100044
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2001
- 稿件说明：
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ZHANG Wen-bo, LIU Bao-yuan, WU Jing-dong. Monitoring of Plant Coverage of Plots by VisualEstimation and Overhead Photograph[J]. Bulletin of Soiland Water Conservation, 2001, 20(6): 60-63.
DOI：

ZHANG Wen-bo, LIU Bao-yuan, WU Jing-dong. Monitoring of Plant Coverage of Plots by VisualEstimation and Overhead Photograph[J]. Bulletin of Soiland Water Conservation, 2001, 20(6): 60-63. DOI：

摘要

选择北京密云、怀柔的2块农地作为样地

对照相法测量植被覆盖度的效果进行了分析

并将之与目估法进行了对比。结果显示照相结合数字图像处理计算植被覆盖度的方法便捷客观

计算植被覆盖度的最大绝对误差不到5%

而目估法测量植被覆盖度具有明显的不可靠性

不同人的目估结果有明显差异。图像分类计算覆盖度的最大误差只相当于个人目估最大绝对误差的10.9%

相当于7人目估平均最大绝对误差的43.1%。

Abstract

Plant coverage is a very important ecological index and it is essential for predicting soil loss quantitatively. The plant coverage of two fields located in Beijing city was measured periodically in order to analyze the errors of overhead photograph and visual estimation for plant coverage. The results showed that the overhead photo graph combined image processing was an accurate and fast method

and the maximal absolute error was less than 5 % . The plant coverage estimated by different persons have significant difference. The individual maximal absolute error was up to 40 % and average maximal absolute error for 7 persons was up to 10. 2 % .

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Related Institution

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