Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Isao Sato and Shuhei Okada and Satoshi Tsuchida,Measurement of land surface BRDF with spatial instability for vicarious calibration,SPIE Proceedings,0277-786X,SPIE,1999-12-28,3870,,254-258,https://cir.nii.ac.jp/crid/1872272492359468032,https://doi.org/10.1117/12.373193