根据纬度/经度确定时区,而不使用像Geonames.org这样的网络服务 [英] Determine timezone from latitude/longitude without using web services like Geonames.org
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问题描述
有没有可能在不使用webservices的情况下确定点(lat / lon)的时区? Geonames.org对我来说不够稳定:我需要这个在PHP中工作。
谢谢
解决方案
我曾经遇到过这个问题,并且做了adam的建议: 来自geonames.org的城市数据库 IIRC花费不到1秒来填充R-Tree,然后它可以每秒执行数千次查询(在5年前的PC上)。
is there any possibility to determine the timezone of point (lat/lon) without using webservices? Geonames.org is not stable enough for me to use :( I need this to work in PHP.
Thanks
解决方案
I had this problem a while back and did exactly what adam suggested:
- Download the database of cities from geonames.org
- convert it to a compact lat/lon -> timezone list
- use an R-Tree implementation to efficiently lookup the nearest city (or rather, its timezone) to a given coordinate
IIRC it took less than 1 second to populate the R-Tree, and it could then perform thousands of lookups per second (both on a 5 year old PC).
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