Address/latitude and longitude converting device and geographical information system using the same
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United States of America Patent
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Dec 19, 2017
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app pub date -
Aug 17, 2015
filing date -
Nov 5, 2014
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Abstract
By converting address information 200 input to a geocoding unit 10 into a tree structure formed hierarchically in an administrative district, generating address tree information obtained by associating latitude and longitude information with at least a node of the lowest layer in each branch of the tree structure and storing the address tree information thus generated in a high-speed accessible memory 14 to proceed a retrieval while tracing the address tree information in order from a parent node to a child node to narrow down a retrieval range, it is possible to efficiently search latitude and longitude information corresponding to given address information therefrom and to perform a retrieval at a higher speed as compared with the related art in which access is given to a conversion table stored in a disk.
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