8- https://doi.org/10.1007/978-3-540-68566-1_3
The Shape Cognition and Query Supported by Fourier Transform
- Jan 1, 2008
- Tinghua Ai +2 more
Abstract As an important function of GIS, spatial query covers not only the extraction of geometric, topologic or semantic information but also the retrieval of spatial cognition related information. This study presents a shape based spatial query way that is formally described as: Select {O i From DataBase Where O i.shape LIKE Template At_Degree <C i >. To extend the new operation LIKE in formal SQL language, the shape representation and measurement have to be built. This study aims at polygon object offering a Fourier transform based method to compute the degree of shape similarity. Through cognition experiment builds the membership function of fuzzy term LIKE. The query experiments show the shape based query retrieves the building result consistent with human cognition.KeywordsSpatial querySpatial cognitionShape measurementFourier transform
- # Retrieval Of Spatial Information
- # Spatial Query
- # Extraction Of Semantic Information
- # Shape Representation
- # Spatial Related Information
- # Semantic Information
- # Fourier Transform
- # Degree Of Similarity
- # Retrieval Of Information
- # Extraction Of Information
