基于格网化表达的县域基本农田集中连片特征提取

Extraction of Concentrated Prime Farmland based on Grid within the Scale of County

研究目的:为快速准确获取基本农田空间分布特征及其集中连片信息,提出在空间数据格网化表达基础上的模糊纹理指数提取方法。研究方法:借助Super Map Objects二次开发平台,设计基本农田单要素属性信息无损格网化程序,针对100 m×100 m、200 m×200 m、400 m×400 m、800 m×800 m 4种格网尺度下的表达结果,综合分析不同尺度格网化表达的空间自相关性。在借鉴空间滤波算法的基础上,分析基本农田要素空间密度分布特征,结合农用地分等定级成果设计模糊纹理指数算法,并且选取山西省泽州县进行实例验证。研究结果:基本农田格网化表达结果可形成连续的空间密度表面,丰富了基本农田空间数据的表达方式,利于空间分析;经模糊纹理指数方法所提取的集中连片指数可用于定量化表达与分析,结合空间密度特征能快速提取基本农田集中连片区。研究结论:该方法可用于提取基本农田的空间分布特征,为基本农田保护、布局优化提供方法借鉴。

The aim of this paper is to propose a spatial grid-based fuzzy texture index extraction method applied to obtain the spatial distribution characteristics, retrieval concentrated contiguous information of prime farmland quickly and accurately. The lossless grid computing program for attribute information of prime farmland was developed on the Super Map Objects platform. Four different spatial grid of 100×100 m, 200×200 m, 400×400 m, 800×800 m were designed and their spatial autocorrelation were analyzed. Based on spatial filtering algorithm, spatial density distribution characteristics of the prime farmland of Zezhou county in Shanxi province were analyzed, and a fuzzy texture index algorithm was also developed based on the classification, gradation and valuation of agricultural land of Zezhou county. Results show that： 1）Grid-based prime farmland can form continuous spatial density surface. This method enriches the spatial data presentation of the prime farmland and is beneficial to analyze the spatial data; 2）the concentrated contiguous index based on fuzzy texture index extraction method can be employed as a quantitative expression of spatial data. Concentrated regions of prime farmland can be extracted quickly using fuzzy texture index extraction method combined with the spatial density distribution characteristics. This paper has established a novel method for spatial distribution information extraction of prime farmland, which supports a theoretical reference for further protection, layout optimization of the prime farmland.