TY - JOUR A1 - Li, C. A1 - Zhu, X. A1 - Guo, W. A1 - Liu, Y. A1 - Huang, H. T1 - RESEARCH ON EXTENSION OF SPARQL ONTOLOGY QUERY LANGUAGE CONSIDERING THE COMPUTATION OF INDOOR SPATIAL RELATIONS JO - Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. J1 - ISPRS-Archives VL - XL-4/W5 SP - 67 EP - 73 Y1 - 2015/05/11 PB - Copernicus Publications SN - 2194-9034 UR - https://isprs-archives.copernicus.org/articles/XL-4-W5/67/2015/ L1 - https://isprs-archives.copernicus.org/articles/XL-4-W5/67/2015/isprsarchives-XL-4-W5-67-2015.pdf DO - 10.5194/isprsarchives-XL-4-W5-67-2015 ER -