摘要
借助数码相机获取苜蓿叶片和参照物图像．经R2V矢量化后利用GIS空间分析技术提取其面积和周长等特征信息。结果表明，参照物周长、面积提取值和实际值之间的平均相对误差仅为0．55％和1．08％．远小于叶面积仪器的测量误差（5％～15％）．说明GIS空间分析技术应用于苜蓿叶面积测定是切实可行的；作为GIS应用的一个拓展，其强大的数据处理功能可一次性自动输出大量苜蓿叶片的单叶周长、单叶面积、叶片数等多项信息，因此与其他叶面积测定方法相比，GIS空间分析技术测定叶面积具有精确、简捷、数据处理量大、额外投资小等优点．适用于在科研领域和生产上推广使用。
A novel method for measuring leave area of M. sativa was developed by using digital camera and GIS software. Firstly, M. sativa leaves and references were taken pictures by digital camera, secondly, pictures were vectored by R2V, and then data of perimeter and area were extracted from vectored pictures by GIS spatial analyst technology. The result showed that average relative error of perimeter and area extracted and actual values of reference were 0.55% and 1.08% less than error range by leaf area apparatus. Therefore, it was feasible to measure leaf area of M. sativa by GIS spatial analyst technology. Also, it could automatically output abundant data such as leaf number, unifoliate perimeter and unifoliate area. Comparing with other methods of measuring leaf area, GIS spatial analyst technology had merits of precision, simple, abundance data and little additional invest etc. , and could be extended in the fields of production and science research.
出处
《草业学报》
CSCD
2006年第2期119-123,共5页
Acta Prataculturae Sinica
基金
农业部948项目(2001-372)
教育部重点项目(重点01167)
农业部农业结构调整重大技术研究专项项目(2002-09-02A)
陕西省科技厅攻关项目(2001k01-J12-04)资助
