Images (.jpg) were taken by flatbed image scanners GT-S650 and GT-S600 (EPSON, Tokyo, Japan) inserted into the soil of a Chamaecyparis obtusa (image names starting with C), and Quercus serrata (image names starting with Q) stands in the Ryukoku forest (Shiga, Japan; image names including RKK), a deciduous mixture forest in Himeji nature observation forest (Hyogo, Japan; image names including HMJ) , an Ilex pedunculosa stand (image names starting with I) area in Yamashiro forest (Kyoto, Japan; image names including YMS). The size of these images is 1180*1180 pixels. The scanners were buried at a depth of approximately 20 cm from the soil surface and image was collected as described in Dannoura et al., 2009 and 2011. Proceeded images (files with_arata) by ARATA were also uploaded.