Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKAHASHI Masayoshi and SAITO Hideki,How many ground control points are needed -Effectiveness of ground control points in SfM processing using UAV images-,The Japanese Forest Society Congress,,The Japanese Forest Society,2021-05-24,132,0,72,https://cir.nii.ac.jp/crid/1390290088581325824,https://doi.org/10.11519/jfsc.132.0_72