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Land resource assessment factor scope dividing method based on shortest path

A technology for evaluating factors and land resources, applied in special data processing applications, instruments, calculations, etc., can solve time-consuming and inefficient problems, reduce dependence and correlation, improve work efficiency, and improve efficiency

Inactive Publication Date: 2012-08-15
WUHAN UNIV
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Problems solved by technology

[0014] Aiming at the problems of inefficiency and time-consuming existing in the existing shortest-path-based land resource evaluation factor scope division method, the present invention improves the existing division method and designs a spatial data decomposition strategy that meets the requirements of parallel computing to realize Parallelization of Scope Division of Land Resource Evaluation Factors

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  • Land resource assessment factor scope dividing method based on shortest path
  • Land resource assessment factor scope dividing method based on shortest path
  • Land resource assessment factor scope dividing method based on shortest path

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Embodiment Construction

[0050] The process flow of the division method of the land resource evaluation point factor scope based on the shortest path designed by the present invention is shown in the appendix figure 1 , the process can be automatically run by those skilled in the art using computer software technology. Among them, steps (1)-(3) are the basic data preprocessing stage of the whole process. The specific implementation process of the embodiment is as follows:

[0051] Step 1. Discretize the evaluation space range of land resources to obtain the grid set G of the entire evaluation space range.

[0052] Meshes are stored as vector rectangles. The smaller the grid, the higher the calculation accuracy and the greater the calculation amount; on the contrary, the lower the calculation accuracy, the smaller the calculation amount. Usually, a grid of 50*50 or 100*100 meters is used to discretize the evaluation space area when evaluating land resources. Such as figure 2 , discretize the eval...

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Abstract

A land resource assessment factor scope dividing method based on a shortest path includes: dispersing an assessment space range of land resource; setting up a road network dataset based on a road network of the assessment space range, wherein the road network dataset comprises network nodes and network edges; dividing the assessment space range into a plurality of assessment subareas; searching the assessment subarea of each grid in a grid set G; inquiring the network node and the assessment factor contained by each obtained assessment subarea; searching the network nodes to centralize the closest assessment factor of each network node; searching the closest assessment factor of each grid in the grid set G; and combining the grids with same closest assessment factors to obtain a corresponding assessment factor scope.

Description

technical field [0001] The invention belongs to the technical field of domain division of land resource evaluation factors, in particular to a method for division of domains of land resource evaluation factors based on the shortest path. Background technique [0002] (1) Land resource evaluation technology [0003] As a country with a large population, land resources are relatively scarce in China. How to use land rationally and realize the sustainable use of land resources is an urgent problem to be solved at present. Using scientific technical means and methods to evaluate the quality of land resources is a necessary way to promote the rational use of land resources and improve the output of land use. [0004] According to the definition of the Food and Agriculture Organization of the United Nations (FAO), land resource evaluation refers to the process of evaluating the effect of land for a specific use mode, including comprehensive quality appraisal of land form, soil, v...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘耀林唐旭赵翔何建华焦利民刘殿锋
Owner WUHAN UNIV