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. Code is here. Poster is here. Slide is here.**