The Question Answering System GeoQA2

We present the geospatial question answering engine GeoQA2 which is the most recent version of the engine GeoQA, originally proposed by Punjani et al. GeoQA2 has been designed to work over the geospatial knowledge graph YAGO2geo. GeoQA2 improves GeoQA by being able to answer more complex geospatial questions (e.g., questions involving aggregates and arithmetic comparisons), having more effective individual components (e.g., for named entity recognition and disambiguation), supporting more templates for generating GeoSPARQL queries, and executing these queries more efficiently by using a technique based on materializing topological relations.