耕地重心和生态背景质量指数

耕地重心和生态背景质量指数

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contributed at 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Classification(s)

Earth System SubjectEarth Surface SystemAnthroposphere
Geography SubjectHuman GeographyAgricultural Geography

Detailed Description

耕地重心和生态背境质量指数

(1) 面积重心模型:

 设已知某区域有n质点P1,P2,…,Pn,其质量(如人口,耕地面积,产值等)分别为Q 1Q2,…,Qn。设Pi(Xi,Yi)到重心M(X,Y)的距离为,则总距离为:

                          

上式无解析解,可用叠代公式求解,叠代公式为:

            

            

(2) 耕地生态背景质量指数:

 QIjj行政单元的耕地生态背景质量指数;Qi为第i级的生态背景等级质量值;Ai为第i级的耕地面积;Sjj行政单元的面积,则:

                    

参考文献:

    高志强,刘纪远,庄大方:我国耕地面积重心和耕地生态背境质量的动态变化。自然资源学报,1998,131

How to cite

《资源环境数学模型手册》 (2018). 耕地重心和生态背景质量指数, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/8bee8f41-7e96-40e0-8a1e-2b4395bee754
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Contributor

contributed at 2018-12-04

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feed back

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