基于数码照片的植被盖度测量方法研究进展

Research progress in the measurement of vegetation fractional coverage based on digital photograph

盖度是植物群落结构的一个重要参数,被广泛地用于生态、水文、水土保持等研究中。基于数码照片的植被盖度测量是精确获取盖度值的一个重要手段。文章对基于数码照片的植被盖度测量方法的相关进展进行了综述,介绍了应用于盖度测量的主要数据源,照片的边缘形变和阴影处理方法,详细分析了各种盖度测量方法的原理、优缺点和适用范围,评述了照片拍摄时间、拍摄角度、光照条件以及植被疏密程度等对盖度测量准确度的影响,并对未来的发展趋势进行了分析。

Fractional coverage is an important parameter of plant community structure. It was widely used in researches of ecology, hydrology, soil and water conservation and so on. Image processing based on digital photograph is a very important approach to get the precise value of vegetation fractional coverage. In this paper, we performed a review on the research progress of the measurement of vegetation fractional coverage. The data sources of photograph, the correction on the distortion at the edge of the photograph, the method to eliminate shadow, the principle, advantage, disadvantage and application scope of different measuring methods of vegetation fractional coverage were well introduced in this paper. The influences of shooting time, shooting angle, illumination conditions and plant density on the measurement of vegetation fractional coverage were specifically summarized in this paper. And perspective of this technique was presented in this paper.