Redis6 new data type geospatial

1. brief introduction

Redis 3.2 Added right to GEO Type of support .GEO,Geographic, Abbreviation for geographic information . This type of , Is the two-dimensional coordinates of the element , On the map is latitude and longitude .redis Based on this type , Longitude and latitude settings are provided , Inquire about , Range queries , Distance inquiry , Longitude and latitude Hash And so on .

2. command

1、geoadd
（1） Format

geoadd<key>< longitude><latitude><member> [longitude latitude member...] add Plus location （ longitude , latitude , name ）

（2） example

geoadd china:city 121.47 31.23 shanghai

geoadd china:city 106.50 29.53 chongqing 114.05 22.52 shenzhen 116.38 39.90 beijing

Be careful ：

1、 Two poles can't be added directly , City data is usually downloaded , Directly through Java The program is imported once .
2、 Effective longitude from -180 C to 180 degree . Effective latitude from -85.05112878 C to 85.05112878 degree .
3、 When the coordinate position is beyond the specified range , The command will return an error .
4、 Added data , You can't add it again .

2、geopos

（1） Format
geopos <key><member> [member...] Get the coordinate value of the specified area

（2） example
3、geodist

（1） Format
geodist<key><member1><member2> [m|km|ft|mi ] Get the linear distance between two positions .
Company ：
m Expressed in meters [ The default value is ].
km Expressed in kilometers .
mi In miles .
ft In feet .
If the user does not explicitly specify the unit parameter , that GEODIST The default is meters

（2） example
Get the linear distance between two positions

4、georadius
（1） Format
georadius<key>< longitude><latitude>radius m|km|ft|mi Centered on a given latitude and longitude , Find the elements in a certain radius .
longitude： longitude
latitude： latitude
radius： distance
m|km|ft|m： Company

（2） example