georadius（查询附近位置）操作

127.0.0.1:6379> ZRANGE city 0 -1  #查看城市
1) "lasa"
2) "kunming"
3) "chongqing"
4) "hefei"
5) "nanjing"
6) "beijing"
#查看指定位置的1000公里范围内有哪些城市
127.0.0.1:6379> georadius city 120 38 1000 km  
1) "beijing"
2) "hefei"
3) "nanjing"
127.0.0.1:6379> georadius city 120 38 400 km  #查看指定位置的400公里范围内有哪些城市
(empty array)
127.0.0.1:6379> georadius city 120 38 550 km  #查看指定位置的550公里范围内有哪些城市
1) "beijing"
#查看指定位置的550公里范围内有哪些城市,withcoord指定返回城市的name
127.0.0.1:6379> georadius city 120 38 1000 km withcoord
1) 1) "beijing"
   2) 1) "116.23128265142440796"
      2) "40.22076905438526495"
2) 1) "hefei"
   2) 1) "117.30793744325637817"
      2) "31.79321915080526395"
3) 1) "nanjing"
   2) 1) "118.89209836721420288"
      2) "31.32750976275760735"
#查看指定位置的550公里范围内有哪些城市,withdist指定返回城市的’经纬度‘值
127.0.0.1:6379> georadius city 120 38 1000 km withcoord withdist
1) 1) "beijing"
   2) "408.3496"
   3) 1) "116.23128265142440796"
      2) "40.22076905438526495"
2) 1) "hefei"
   2) "732.6371"
   3) 1) "117.30793744325637817"
      2) "31.79321915080526395"
3) 1) "nanjing"
   2) "749.0265"
   3) 1) "118.89209836721420288"
      2) "31.32750976275760735"
#查看指定位置的550公里范围内有哪些城市,withhash指定返回城市的’经纬度‘的hash值
#如果两个城市的hash值越’像‘，证明城市距离越近！
127.0.0.1:6379> georadius city 120 38 1000 km withcoord withdist withhash
1) 1) "beijing"
   2) "408.3496"
   3) (integer) 4069896088584598
   4) 1) "116.23128265142440796"
      2) "40.22076905438526495"
2) 1) "hefei"
   2) "732.6371"
   3) (integer) 4052763834193093
   4) 1) "117.30793744325637817"
      2) "31.79321915080526395"
3) 1) "nanjing"
   2) "749.0265"
   3) (integer) 4054278565840695
   4) 1) "118.89209836721420288"
      2) "31.32750976275760735"
#查看指定位置的550公里范围内有哪些城市,count num 指定返回’num‘个城市数据量
127.0.0.1:6379> georadius city 120 38 1000 km withcoord withdist withhash count 2
1) 1) "beijing"
   2) "408.3496"
   3) (integer) 4069896088584598
   4) 1) "116.23128265142440796"
      2) "40.22076905438526495"
2) 1) "hefei"
   2) "732.6371"
   3) (integer) 4052763834193093
   4) 1) "117.30793744325637817"
      2) "31.79321915080526395"