Method and device for obtaining graphic data of county-scale abandoned land

Abstract

The invention discloses a method and device for obtaining graphic data of county-scale abandoned land, relating to the field of land utilization and ecological process. The method comprises that area-distribution graphic data of present effective farmland-to-forestry and forest projects is obtained according to a distribution map of the present effective farmland-to-forestry and forest projects; area-distribution graphic data of farmland beforehand and area-distribution graphic data of farmland at present are spatially superposed to obtain area-distribution graphic data of farmland change; and the area-distribution graphic data of present effective farmland-to-forestry and forest projects is deducted from the area-distribution graphic data of farmland change to obtain area-distribution graphic data of county-scale abandoned land. Thus, the position, area and distribution of the county-scale abandoned land can be better obtained, and technical support is provided for monitoring, planning, policy making and management of land utilization.

Description

technical field [0001] The invention relates to the fields of land use and ecological processes, and in particular to a method and device for obtaining graphic data of abandoned land at the county scale. Background technique [0002] Due to factors such as undulating terrain, fragmented land plots, and inconvenient transportation, cultivated land in mountainous areas does not have the conditions for large-scale mechanized production. Withdrew from the middle of the country, resulting in being "marginalized"—abandoned. More importantly, under the background of overall planning of urban and rural development, a large number of young and middle-aged laborers have been "precipitated" from the countryside due to the impact of population urbanization and the increase in the opportunity cost of farming; more intensive. The squeeze between the two causes the marginal income of poor-quality cultivated land to decrease, lose the value of cultivation, and be marginalized. [0003] H...

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Problems solved by technology

[0003] However, what needs to be answered most at present is where does the marginalization of cultivated land in mountainous areas occur? What are the performance characteristics? To what extent do various factors play a role? However, the existing literature has not obtained a scientific and clear quantitative understanding of the above issues.

In the clarification of occurrence domains, it is more common to use statistical data based on administrative boundaries, and it is relatively rare to obtain spatial information that breaks administrative boundaries to reflect the site conditions of plots, so that it is impossible to obtain information on the circumstances under which cultivated land will appear marginalized ; In the description of performance characteristics, more attention is paid to the description of qualitative type conversion or change of utilization mode, and the spatial elements of the occurrence domain are not reflected in the connotation of characteristics and the quantification of diagnostic standards, so that the marginalization under different site conditions cannot be given Spatial characteristics; in the identification of influencing factors, natural influencing factors are often confused with socio-economic driving factors, and the organic combination of the possibility of impacting marginalization and the driving force of marginalization cannot be realized, and the conditions under which marginalization occurs and the conditions for marginalization cannot be given. what is the trigger

Moreover, using statistical data as the main data source to carry out the characteristic analysis and identification of driving factors of cultivated land marginalization will cause large deviations, resulting in poor results in practical applications

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