Journals

• Yuchen Ji, Daichi Amagata, Yuya Sasaki, and Takahiro Hara. PolyCard: A Learned Cardinality Estimator for Intersection Queries on Spatial Polygons Journal of Intelligent Information Systems, volume 63, pages 873-891, 2025.

Conferences

• Daichi Amagata and Jimin Lee Top-k Range Search on Weighted Interval Data Proceedings of the International Symposium on Spatial and Temporal Data (SSTD), pages xx-xx, 2025. The authors contributed to this work equally.
• Ryo Shirai, Ryo Imai, and Daichi Amagata Target and Non-target Category Classification from GPS and Check-in Data Proceedings of the International Symposium on Spatial and Temporal Data (SSTD), pages xx-xx, 2025. Industrial Track. Code is here.
• Daichi Amagata, Kazuyoshi Aoyama, Keito Kido, and Sumio Fujita How to Mine Potentially Popular Items? A Reverse MIPS-based Approach Proceedings of the International Conference on Scientific and Statistical Database Management (SSDBM), pages 9:1-9:11, 2025. The first two authors contributed to this work equally. arXiv version is here.
• Daichi Amagata, Kazuyoshi Aoyama, Keito Kido, and Sumio Fujita Approximate Reverse k-Ranks Queries in High Dimensions Proceedings of the International Conference on Scientific and Statistical Database Management (SSDBM), pages 17:1-17:6, 2025. The first two authors contributed to this work equally. arXiv version is here.
• Keito Kido, Daichi Amagata, and Takahiro Hara. Fast Approximation Algorithm for Euclidean Minimum Spanning Tree Building in High Dimensions Proceedings of the Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD), pages 432-443, 2025. Special Session: Data Science: Foundations and Applications (DSFA) Code is here.
• Daichi Amagata **Random Sampling over Spatial Range Joins Proceedings of the IEEE International Conference on Data Engineering (ICDE), pages 2080–2093, 2025. arXiv version is here. Code is here. Poster is here. Slide is here.**