A grid-based spatial clustering method for monitoring the cultivated land quality in China at the national scale

Cong Ou1, Jianyu Yang1, Zhenrong Du1, Bingbo Gao1, Dehai Zhu1, Zhenbo Du1 and Key Laboratory for Agricultural Land Quality Monitoring and Control, Ministry of Natural Resources, P.R.C, (1)CAU China Agricultural University, College of Land Science and Technology, Beijing, China