| GIS空间分析技术在苜蓿叶面积测定中的应用 |
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| 引用本文： | 刘玉华,贾志宽,史纪安,韩清芳.GIS空间分析技术在苜蓿叶面积测定中的应用[J].草业学报,2006,15(2):119-123. |
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| 作者姓名： | 刘玉华 贾志宽 史纪安 韩清芳 |
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| 作者单位： | 西北农林科技大学农学院,陕西,杨凌712100;西北农林科技大学农学院,陕西,杨凌712100;西北农林科技大学农学院,陕西,杨凌712100;西北农林科技大学农学院,陕西,杨凌712100 |
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| 基金项目： | 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 |
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| 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。
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| 关 键 词： | 地理信息系统 空间分析 苜蓿 叶面积 |
| 文章编号： | 1004-5759（2005）02-0119-05 |
| 收稿时间： | 2004-10-25 |
| 修稿时间： | 2004年10月25日 |
Application of GIS spatial analyst technology to measuring leaf area of Medicago sativa |
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| LIU Yu-hua,JIA Zhi-kuan,SHI Ji-an,HAN Qing-fang.Application of GIS spatial analyst technology to measuring leaf area of Medicago sativa[J].Acta Prataculturae Sinica,2006,15(2):119-123. |
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| Authors: | LIU Yu-hua JIA Zhi-kuan SHI Ji-an HAN Qing-fang |
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| Institution: | Agricultural College, Northwestern Sci-tech University of Agriculture and Forestry, Yangling 712100, China |
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| Abstract: | 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. |
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| Keywords: | GIS spatial analyst Medicago sativa leaf area |
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