7Chen J. Rapid urbanization in China:A real challenge to soil pro- tection and food security[ J]. Catena,2007,69( 1 ) :1 -15.
8Wardlow B D, Egbert S L. Large - area crop mapping using time - series MODIS 250 m NDVI data:An assessment for the U. S. Cen- tral Great Plains [ J ]. Remote Sensing of Environment, 2008,112 (33) :1096 - 1116.
9Jia K, Wu B F, Li Q Z. Crop classification using HJ satellite multi- spectral data in the North China Plain[ J]. Journal of Applied Re- mote Sensing,2013,7( 1 ) :073576.
10Yonezawa C, Negishi M, Azuma K, et al. Growth monitoring and classification of rice fields using multitemporal RADARSAT - 2 full - polarimetric data [ J ]. International Journal of Remote Sens- ing,2012,33(18) :5696 -5711.