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Approximate Query Processing in Spatial Databases Using Raster Signatures

Leonardo AzevedoGeraldo ZimbrãoJano Souza

Traditional query processing provides exact answers to queries. However, in many applications, the response time of exact answers is often longer than what is acceptable. Approximate query processing has emerged as an alternative approach to give to the user an answer in a short time. The goal is to provide an estimated result in one order of magnitude less time than the time to compute the exact answer. There is a large set of techniques for approximate query processing; however, most of them are only suitable for traditional data. This work proposes new algorithms for a set of spatial operations that can be processed approximately using 4CRS (Four-Color Raster Signature).

http://www.geoinfo.info/geoinfo2006/papers/p20.pdf

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