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Spatial search with Geohashes |
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Spatial search is a growing area in the Lucene/Solr community that is steadily progressing. One method used to accomplish spatial search involves geohashes. A geohash is a latitude/longitude geocode system in the public domain, described in detail on Wikipedia. Geohashes are strings that further narrow a latitude-longitude box on the earth with each added character. Given this property, Lucene’s inverted index is well suited as the basis for a geohash-based search filter. There are two challenges to such an implementation: One is dealing with the fact that not every point near another necessarily has the same prefix due to inevitable box boundary conditions. Secondly, an ideal implementation should be optimized to handle searches spanning a great number of points. This presentation will discuss such an implementation with closing thoughts on addressing performance for the latter case.
Uploaded by: lucid12 Added: 1 year ago
Views: 812 Thumbs: 0 Comments: 0
Tags:
Lucene
Solr
Spatial search
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三维GIS数据模型之初步探讨 |
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With the rapid development of science and technology, the application of GIS technology are increasingly being used in all walks of life, while the three-dimensional GIS data technology has accelerated the emergence of GIS-socialization, mass and the enterprise, enabling GIS is now making a stable, strong and vigorous steps towards maturity. This paper describes the basic concepts, the latest research and data structure of the three-dimensional GIS data model, and three-dimensional spatial databases and other related functions of an overview of the content.
Uploaded by: huzi551 Added: 2 years ago
Views: 1034 Thumbs: 0 Comments: 0
Tags:
Three-dimensional
GIS，Three-dimensional
data
structure，Octree，Three-dimensional
spatial
database
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