《Table 4 Statistics of abandoned farmland reclamation in Qingyun and Wudi counties of 1993–2017》

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《撂荒耕地的提取与分析——以山东省庆云县和无棣县为例（英文）》

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The data used in this study include 30 m resolution Landsat images 1990–2011 and2013–2017 from US Geological Survey（USGS）（http://glovis.usgs.gov/） ，with 30 m resolution HJ-1A data obtained from China Resource Satellite Application Center（http://www.cresda.com/CN/）replacing 7 Landsat images of 2012 due to visible stripes in these mages.Time series images for 1990–2017 were collected with 2 images in each year，i.e.56images over 28 years in total.Images were mainly collected for the same two periods each year:April to June and July to October.Table 1 shows specific image details.We also used 30 m resolution DEM data from the spatial data cloud（http://www.gscloud.cn/）as auxiliary data for classification.The 30 m resolution land classification product（1995，2000，2005，2010，2015）from Resource and Environment Data Cloud Platform（http://www.resdc.cn/）and Google Earth images were used as basic data to select training and validation samples.