Analysis on Land Utilization Change along Yangzhou Section of Beijing-Hangzhou Grand Canal Based on GIS

Based on SPOT5 images in 2002 and GF1 images in 2022, selecting a 1km wide east-west scope of Yangzhou section of Beijing-Hangzhou Grand Canal, the random forest method was used to classify the land utilization. Based on the land utilization conversion matrix, land utilization dynamic model and center of gravity transfer model, the images were compared with before after classifying. The results showed that the cultivated land, forest land and water area in research area decreased during 20 years, while the area of grassland, construction land and unutilized land increased. Cultivated land is the land type with the largest transfer area of 51.26 km2, and the main transfer area is construction land. The dynamic attitude of comprehensive land utilization was 0.63% in research area, and the change of the total land utilization type and quantity was relatively stable. The dynamic attitude of single land utilization of unutilized land and construction land was 4.61% and 4.10%, respectively, and the change of quantity was relatively drastic. The cultivated land and forest land migrated to the north, while the construction land and water area migrated to the south, and the largest distance of cultivated land migration is 6.38 km.