10_ Redis_ geospatial_ command

geospatial（ Location ）

geospatial The related documents

purpose ：
Friends' positioning , The man near the , Taxi distance calculation ?

Redis Of Geo stay Redis3.2 The version was launched ! This function can calculate the location information , The distance between the two places , People in a few miles around !

Relevant command （ Only 6 An order ）

• GEOADD
• GEODIST
• GEOHASH
• GEOPOS
• GEORADIUS
• GEORADIUSBYMEMBER

geoadd

geoadd

geoadd // Add location
The rules ： Two levels cannot be added directly , We usually download city data , Directly read the configuration file and import it at one time !
127.0.0.1:6379> geoadd china:city 39.90 116.40 beijing
(error) ERR invalid longitude,latitude pair 39.900000,116.400000 // The reason for the error is that the longitude and latitude are written backwards
Parameters key - - - value （ longitude 、 latitude 、 name )

Effective longitude from -180 C to 180 degree .

Effective latitude from -85.05112878 C to 85.05112878 degree

127.0.0.1:6379> geoadd china:city 116.40 39.40 beijing
(integer) 1
127.0.0.1:6379> geoadd china:city 121.47 31.23 shanghai
(integer) 1
127.0.0.1:6379> geoadd china:city 106.50 29.53 chongqing 114.05 22.52 shengzhen
(integer) 2
127.0.0.1:6379> geoadd china:city 120.16 30.24 hangzhou 108.96 34.26 xian
(integer) 2

GEOPOS

geopos
Get the current location : It must be a coordinate value !

geopos // Gets the longitude and latitude of the specified city
127.0.0.1:6379> geopos china:city beijing
1 ) 1) “116.39999896287918091”
2) “39.40000099577971326”
127.0.0.1:6379> geopos china:city beijing chongqing // Get the longitude and latitude of Beijing and Chongqing
1 ) 1) “116.39999896287918091”
2 ) “39.40000099577971326”
2 ) 1 ) “106.49999767541885376”
2 ) “29.52999957900659211”

geodist

geodist
Returns the distance between two given positions .

Company ：

• m Expressed in meters .
• km Expressed in kilometers .
• mi In miles .
• ft In feet

127.0.0.1:6379> GEODIST china:city beijing shanghai
“1018116.5434”
127.0.0.1:6379> GEODIST china:city beijing shanghai km // The straight distance from Beijing to Shanghai ： Company km
“1018.1165”

GEORADIUS

georadius
Centered on a given latitude and longitude , Return key contains position elements , All position elements whose distance from the center does not exceed the given maximum distance

The man near the ： First, get the addresses of all people nearby , location !

127.0.0.1:6379> GEORADIUS china:city 110 30 1000 km // Query longitude is 110, Latitude is 30, radius 1000km Cities within range
1 ) “chongqing”
2 ) “xian”
3 ) “shengzhen”
4 ) “hangzhou”

GEORADIUSBYMEMBER

GEORADIUSBYMEMBER
Find other elements around the specified element !

This command and GEORADIUS command , Can find the elements in the specified range , however The center point of is determined by a given location element , Not like it GEORADIUS like that , Use the entered longitude and latitude to determine the center point GEORADIUSBYMEMBER

The location of the specified member is used as the center of the query .

127.0.0.1:6379> GEORADIUSBYMEMBER china:city beijing 1000 km // Find a radius centered on Beijing 1000km Cities within range
1 ) “beijing”
2 ) “xian”

GEOHASH

GEOHASH

Returns the... Of one or more positional elements Geohash Express .

The command will return 11 A character Geohash character string !

Convert two-dimensional latitude and longitude into one-dimensional string , If the two strings are closer , So the closer we get !
127.0.0.1:6379> GEOHASH china:city beijing
1 ) “wx4b0sxcss0”
127.0.0.1:6379> GEOHASH china:city beijing chongqing // Returns the longitude and latitude hash values of Beijing and Chongqing
1 ) “wx4b0sxcss0”
2 ) “wm5xzrybty0”

GEO The underlying implementation principle is actually Zset ! We can use Zset Command to operate geo !

127.0.0.1:6379> zrange china:city 0 -1 // Look at all the elements in the map
1 ) “chongqing”
2 ) “xian”
3 ) “shengzhen”
4 ) “hangzhou”
5 ) “shanghai”
6 ) “beijing”
127.0.0.1:6379> zrem china:city beijing // Removes the specified element !
(integer) 1
127.0.0.1:6379> zrange china:city 0 -1
1 ) “chongqing”
2 ) “xian”
3 ) “shengzhen”
4 ) “hangzhou”
5 ) “shanghai”