find nearby facebook users

Label:Before very silly very naïve thought is nothing more than a distance, and then compare out on the line, and then when the access to a lot of users, and the database in the latitude information a lot of time, the rapid increase in computational capacity, can make the server completely stupid, or old-timer experience than we rich, gave me a great revelation.MySQL Performance tuning – distance calculation using a faster algorithmRecently encountere

Reference Documentation:Http://blog.csdn.net/wangxiafghj/article/details/9014363geohash algorithm principle and realization methodHttp://blog.charlee.li/geohash-intro/geohash: Using strings to search for nearby locationsHttp://blog.sina.com.cn/s/blog_7c05385f0101eofb.html find nearby points--geohash scenario discussionhttp://www.wubiao.info/372

Reference Documentation: Http://blog.csdn.net/wangxiafghj/article/details/9014363geohash algorithm principle and realization method Http://blog.charlee.li/geohash-intro/geohash: Using strings to search for nearby locations Http://blog.sina.com.cn/s/blog_7c05385f0101eofb.html find nearby points--geohash scenario discussion http://www.wubiao.info/372

Reference Documentation:Http://blog.csdn.net/wangxiafghj/article/details/9014363geohash Algorithm principle and realization methodHttp://blog.charlee.li/geohash-intro/geohash: Using strings to search for nearby locationshttp://blog.sina.com.cn/s/blog_7c05385f0101eofb.html Find nearby points--geohash scenario discussionhttp://www.wubiao.info/372

Geohash has the following features:First, Geohash uses a string to represent the longitude and latitude two coordinates. With Geohash, you simply apply the index on one column.Second, Geohash represents not a point, but a rectangular area. For example, the code WX4G0EC19, which represents a rectangular region. Users can publish address codes to show that they are located near Beihai Park without exposing their precise coordinates, which helps protect

With the popularity of mobile terminals, many applications are based on the LBS function, the vicinity of So-and-so (restaurants, banks, sister paper, etc.). In the basic data, the latitude and longitude of the target location are generally preserved, and the latitude and longitude of the users are compared to obtain the proximity. Goal:Finds nearby xxx, returns the result from near to far, and the result h

. Fact: We have not done this, nor is it our intention. However, the researchers do find loopholes that may send cookies to people who are not Facebook users. This is not our intention and has been fixed for related issues. We do not install cookies on the browser of a user who has never registered with the Facebook