This paper proposes the discriminant analysis on land grading after analyzing the common methods and discussing the Fisher’s discriminant in detail.Actually this method deduces the dimension from multi to single,thus...This paper proposes the discriminant analysis on land grading after analyzing the common methods and discussing the Fisher’s discriminant in detail.Actually this method deduces the dimension from multi to single,thus it makes the feature vectors in n-dimension change to a scalar,and use this scalar to classify samples.This paper illustrates the result by giving an example of the residential land grading by the discriminant analysis.展开更多
In order to objectively and reasonably evaluate the actual and potential value of cultivated land,both social and ecological values are introduced into the classification and grading index system of cultivated land ba...In order to objectively and reasonably evaluate the actual and potential value of cultivated land,both social and ecological values are introduced into the classification and grading index system of cultivated land based on the viewpoint of sustainable development,after considering the natural and economic values of cultivated land.Index system construction of the sustainable utilization of cultivated land should follow the principles of economic viability,social acceptability,and ecological protection.Classification of cultivated land should take into account the soil fertility of cultivated land.Then,grading of cultivated land is carried out from the practical productivity(or potential productivity)of cultivated land.According to the existing classification index system of cultivated land,the soil,natural and environmental factors in plains,mountains and hills are mainly modified in the classification index system of cultivated land.And index systems for the cultivated land classification in plains,mountains and hills are set up.The grading index system of cultivated land is established based on the economic viability(economic value),social acceptability(social value)and protection of cultivated land(ecological value).Quantitative expression of cultivated land grading index is also carried out.展开更多
With the increasing requirement for the protection of arable land, monitor- ing the grades of arable land quality is becoming more important, which can accu- rately and fully reflect the current situation and developm...With the increasing requirement for the protection of arable land, monitor- ing the grades of arable land quality is becoming more important, which can accu- rately and fully reflect the current situation and development trends of arable land quality. It is also an important measure for protecting the quality of arable land. in the present study, the distribution and changes of arable lands of different gradient types and grades in Lingchuan County, Guangxi Zhuang Autonomous Region in 2015 were monitored and evaluated, to analyze the trends and reasons for the changes in the quality and productivity of arable lands, and to provide references for dynamic monitoring of the quality of arable land.展开更多
With the classifi cation data covering American land-use/land-cover (LUCC) with 30 m resolu tion from the project of National Land Cover Data (NLCD), we normalize d them and made their resolution changed into 1 km ...With the classifi cation data covering American land-use/land-cover (LUCC) with 30 m resolu tion from the project of National Land Cover Data (NLCD), we normalize d them and made their resolution changed into 1 km ×1 km, created the data of American land-use grade and analyzed the spatial distribution and featur es of American LUCC as well as the influence of population and altit ude on the land-use grade in light of methods of sampling analysis a nd correlation study. Based on the analysis, we concluded that forestr y and grassland, accounting for 71.24% of the whole country, has taken the main part of American land cover, and besides, construction and arable land has occupied 19.22% of the total land, the rest of land cover types, including water area, wetland and underdeveloped land, is 9. 54% of the country's total. The developing potential of American land resources is enormous with less destroyed and disturbed ecological environment. Although, in some sense, the population and altitude influence the sp atial variation of American land-use grade respectively, the influence of spatial variation of altitude and population density on that of la nd-use grade is not significanct.展开更多
基金Funded by Program of Land Evaluating and Planning in Wuhan City(No.205232343).
文摘This paper proposes the discriminant analysis on land grading after analyzing the common methods and discussing the Fisher’s discriminant in detail.Actually this method deduces the dimension from multi to single,thus it makes the feature vectors in n-dimension change to a scalar,and use this scalar to classify samples.This paper illustrates the result by giving an example of the residential land grading by the discriminant analysis.
基金Supported by the Key Project of Chinese Ministry of Education(108098)the National Natural Science Foundation of China(40671078,40771088)the Dangui Plan of Huazhong Normal University
文摘In order to objectively and reasonably evaluate the actual and potential value of cultivated land,both social and ecological values are introduced into the classification and grading index system of cultivated land based on the viewpoint of sustainable development,after considering the natural and economic values of cultivated land.Index system construction of the sustainable utilization of cultivated land should follow the principles of economic viability,social acceptability,and ecological protection.Classification of cultivated land should take into account the soil fertility of cultivated land.Then,grading of cultivated land is carried out from the practical productivity(or potential productivity)of cultivated land.According to the existing classification index system of cultivated land,the soil,natural and environmental factors in plains,mountains and hills are mainly modified in the classification index system of cultivated land.And index systems for the cultivated land classification in plains,mountains and hills are set up.The grading index system of cultivated land is established based on the economic viability(economic value),social acceptability(social value)and protection of cultivated land(ecological value).Quantitative expression of cultivated land grading index is also carried out.
文摘With the increasing requirement for the protection of arable land, monitor- ing the grades of arable land quality is becoming more important, which can accu- rately and fully reflect the current situation and development trends of arable land quality. It is also an important measure for protecting the quality of arable land. in the present study, the distribution and changes of arable lands of different gradient types and grades in Lingchuan County, Guangxi Zhuang Autonomous Region in 2015 were monitored and evaluated, to analyze the trends and reasons for the changes in the quality and productivity of arable lands, and to provide references for dynamic monitoring of the quality of arable land.
基金National Natural Science Foundation of China, No. 90202002.
文摘With the classifi cation data covering American land-use/land-cover (LUCC) with 30 m resolu tion from the project of National Land Cover Data (NLCD), we normalize d them and made their resolution changed into 1 km ×1 km, created the data of American land-use grade and analyzed the spatial distribution and featur es of American LUCC as well as the influence of population and altit ude on the land-use grade in light of methods of sampling analysis a nd correlation study. Based on the analysis, we concluded that forestr y and grassland, accounting for 71.24% of the whole country, has taken the main part of American land cover, and besides, construction and arable land has occupied 19.22% of the total land, the rest of land cover types, including water area, wetland and underdeveloped land, is 9. 54% of the country's total. The developing potential of American land resources is enormous with less destroyed and disturbed ecological environment. Although, in some sense, the population and altitude influence the sp atial variation of American land-use grade respectively, the influence of spatial variation of altitude and population density on that of la nd-use grade is not significanct.
