QA (question answering) systems designated for answering in-depth geographic questions are highly demanded but not quite available. Previous research has visited various individual aspects of a QA system but few syner...
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ISBN:
(纸本)9780769551197
QA (question answering) systems designated for answering in-depth geographic questions are highly demanded but not quite available. Previous research has visited various individual aspects of a QA system but few synergistic frameworks have been proposed. This paper investigates the nature of geographic question formation and observes their unique linguistic structures that can be semantically translated into a spatial query. We create a new task of solving non-trivial questions using GIS (Geographic Information System) and test it with an associated corpus. A dynamic programming algorithm is developed for classification and voting algorithm for verification. Two types of ontologies are integrated for disambiguating and discriminating spatial terms. PostGIS serves as the GIS backend to provide domain expertise for spatial reasoning. Results show that exact answers can be returned quickly and correctly by our system. Contrast classification results in improved accuracy compared with the baseline which proves the effectiveness of proposed methods.
No matter how much complicated Chinese query sentences may be, they are always made up of query targets, query conditions and grouping segments. The query targets are often at the tail of a sentence or behind the inte...
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ISBN:
(纸本)9780819465306
No matter how much complicated Chinese query sentences may be, they are always made up of query targets, query conditions and grouping segments. The query targets are often at the tail of a sentence or behind the interrogative word. As a result, to comprehend a query sentence, the first step is to get the query targets, and then extraction the query conditions and grouping segments from the rest information of the sentence. The Semantic-analyzing of the query target, query condition and grouping are researched and some corresponding algorithms are presented in this paper. Some groups of Chinese query sentences of different structure be tested, which show that these algorithms are feasible and effective. They are worth further researched.
Geospatial semantic querying to geographical databases has been recognized as an hot topic in GIS research. Most approaches propose to adopt an ontology as a knowledge representation structure on top of the database, ...
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ISBN:
(纸本)9783642206290
Geospatial semantic querying to geographical databases has been recognized as an hot topic in GIS research. Most approaches propose to adopt an ontology as a knowledge representation structure on top of the database, representing the concepts the user can query. These concepts are typically directly mapped to database tables. In this paper we propose a methodology where the ontology is further exploited mapping axioms to spatial sql queries. The main advantage of this approach is that semantic-rich geospatial queries can be abstractly represented in the ontology and automatically translated into spatial sql queries.
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