Research On The Evaluation Of The Quality Of Cultivated Land At County Level Based On GIS And RS

This study takes Lixin County as the research area,and the cultivated land quality grade evaluation method and GIS based on the national standard of "Cultivated Land Quality Grade"(GB/T33469-2016,hereinafter referred to as "National Standard")jointly issued by the National Standards Committee and the Ministry of Agriculture were used respectively.Based on the Google Earth Engine cloud computing platform and the analytic hierarchy process,the RS cultivated land quality grade evaluation method is used to carry out the grade evaluation research on the cultivated land quality of Lixin County in 2019.The main research results are as follows:(1)The GIS-based arable land quality grade evaluation method is based on the index system stipulated in the "National Standards" to evaluate the quality of cultivated land in Lixin County in 2019.The cultivated land in Lixin County is divided into six quality grades,with a comprehensive grade of 3.83,based on RS cultivated land The quality evaluation method is to evaluate the quality of cultivated land in Lixin County by using the grade points stipulated by the "National Standards" Law,and divide Lixin County into six quality grades,with a comprehensive grade of 3.82.(2)Through the comparative analysis of the evaluation results of the two methods,it is found that although the two evaluation results have different grades,the comprehensive grades are relatively close,and the difference is only 0.01.Moreover,the spatial distribution of different grades of cultivated land has high similarity,and the same grade is the same area.The number of pixels accounted for 25.31%.Using the GIS-based farmland quality grading evaluation method as a benchmark,it was verified that the RS-based farmland quality grading evaluation results in 3-5 and other places are highly consistent with the GIS-based evaluation results.The evaluation results in the first-class,second-class and sixth-class places are quite different.Through the comparative analysis of the advantages and disadvantages of the two methods,it is found that the evaluation method based on RS is better than the evaluation method based on GIS as a whole.