TY - JOUR A1 - You, L. A1 - Lin, H. T1 - A CONCEPTUAL FRAMEWORK FOR VIRTUAL GEOGRAPHIC ENVIRONMENTS KNOWLEDGE ENGINEERING JO - Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. J1 - ISPRS-Archives VL - XLI-B2 SP - 357 EP - 360 Y1 - 2016/06/08 PB - Copernicus Publications SN - 2194-9034 UR - https://isprs-archives.copernicus.org/articles/XLI-B2/357/2016/ L1 - https://isprs-archives.copernicus.org/articles/XLI-B2/357/2016/isprs-archives-XLI-B2-357-2016.pdf DO - 10.5194/isprs-archives-XLI-B2-357-2016 ER -