水土保持通报2017，Vol.37Issue(5)：270-275,6.DOI:10.13961/j.cnki.stbctb.2017.05.046
基于低空可见光谱的植被覆盖率计算
Vegetation Coverage Calculation Based on Low Altitude Visible Spectrum
摘要
Abstract
[Objective] Applying low altitude remote sensing to the acceptance of soil and water conservation facilities so as to extract vegetation information based on visible spectrum from remote sensing image,and to propose an accurate and objective method to calculate the coverage rate which is an indicator of the soil and water conservation facilities evaluation in the hope of reducing workload and improving effectiveness.[Methods] The spectral characteristics of low-altitude remote sensing images containing only visible spectral information were analyzed by five vegetation indices as RGRI (ration vegetation index),EXG (excess green),VDVI (visible-band difference vegetation index),NGBDI (normalized green-blue difference index)and NRGRDI (normalized green-red difference index).And the threshold of each vegetation index was determined by the maximum entropy method or bimodal histogram method.Furthermore,with the help of ENVI,the vegetation information was extracted and the vegetation coverage were then calculated and compared with references.[Results] The accuracy of vegetation information extracted from the visible-band difference vegetation index (VDVI) was as high as 95.32％,and the vegetation coverage was 54.43％,which was the closest to the actual value.[Conclusion] It is feasible to calculate vegetation coverage from remote sensing image based on visible band.The method can provide real-time data as supporting information for the acceptance assessment of soil and water conservation facilities with its advantage of few artificial intervention and high accuracy.关键词
可见光谱/水土保持设施验收/植被覆盖率Key words
visual spectrum/acceptance of soil and water conservation facilities/vegetation coverage分类
农业科技引用本文复制引用
卞雪,马群宇,刘楚烨,赵言文..基于低空可见光谱的植被覆盖率计算[J].水土保持通报,2017,37(5):270-275,6.基金项目
国家自然科学基金重点项目“农村发展中生态环境管理研究”(70833001) （70833001）
