TY - JOUR A1 - Tokita, H. A1 - Arikawa, M. A1 - Si, R. A1 - Sato, R. A1 - Tayama, R. A1 - Takahashi, A. T1 - Virtual Circular Geofences for Points and Regions of Interests with Spatial Context JO - Abstr. Int. Cartogr. Assoc. J1 - ICA-Abs VL - 1 SP - 366 EP - Y1 - 2019/07/15 PB - Copernicus Publications SN - 2570-2106 UR - https://ica-abs.copernicus.org/articles/1/366/2019/ L1 - https://ica-abs.copernicus.org/articles/1/366/2019/ica-abs-1-366-2019.pdf DO - 10.5194/ica-abs-1-366-2019 ER -