Evaluation of Mechanized Upgrading of Farmland in Mountainous Areas Based on High Resolution Re-mote Sensing Image

Abstract

It is an important means to make up for the short board of Agricultural Mechanization in Hilly and mountainous areas to carry out the transformation of farmland suitable for mechanization and expand the application space of large and medium-sized agricultural machinery. At present, the research on cultivated land consolidation mainly focuses on the construction evaluation and post construction evaluation of high standard farmland remediation projects, and there is a lack of literature on the evaluation of cultivated land suitable for mechanization. This paper proposes a comprehensive evaluation method of cultivated land mechanization in the target area by using high-resolution image and high precision DEM data, based on ArcGIS sampling calculation of four index values, such as the rectangular degree, area, length width ratio, height difference, combined with the agricultural machinery structure of the area. Based on the sampling measurement of 10 villages in five agricultural areas of Nanjing, the overall rectangular degree of Nanjing is about 0.59, 84.23% of the plots are less than 0.75; the average plot area is about 0.32 ha, 87.5% of the land area is larger than 667 m2; the overall aspect ratio of the plot is about 1.67, The results showed that 81.15% of the cultivated land had a length width ratio of less than 2:1, and 95.6% of the plots had a length width ratio of less than 3:1; the average height difference of the plots was about 0.35 m, and the compliance rate of the mechanization degree of the height difference was 100%.The focus of arable land reconstruction should be on small plots to be larger, the plot shape should be rectangular and striped, and the plot length to width ratio should be no less than 3:1.