find the nearest location by latitude and longitude in postgresql

how to find nearest location using latitude and longitude in mysql
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how to find nearest location using latitude and longitude in javascript
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Hi i'm trying find the nearest location by latitude and longitude in postgresql database.But when i run the below query it showing column distance does not exists.

ERROR:  column "distance" does not exist
LINE 1: ... ) ) ) AS distance FROM station_location   HAVING distance <...
                                                             ^
********** Error **********

ERROR: column "distance" does not exist
SQL state: 42703
Character: 218

CREATE TABLE station_location
(
  id bigint NOT NULL DEFAULT nextval('location_id_seq'::regclass),
  state_name character varying NOT NULL,
  country_name character varying NOT NULL,
  locality character varying NOT NULL,
  created_date timestamp without time zone NOT NULL,
  is_delete boolean NOT NULL DEFAULT false,
  lat double precision,
  lng double precision,
  CONSTRAINT location_pkey PRIMARY KEY (id)
)

SELECT  *,( 3959 * acos( cos( radians(6.414478) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(12.466646) ) + sin( radians(6.414478) ) * sin( radians( lat ) ) ) ) AS distance 
FROM station_location
HAVING distance < 5
ORDER BY distance
LIMIT 20;

select * from (
SELECT  *,( 3959 * acos( cos( radians(6.414478) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(12.466646) ) + sin( radians(6.414478) ) * sin( radians( lat ) ) ) ) AS distance 
FROM station_location
) al
where distance < 5
ORDER BY distance
LIMIT 20;

find the nearest location by latitude and longitude in postgresql , select * from ( SELECT *,( 3959 * acos( cos( radians(6.414478) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(12.466646) ) + sin(  We have loaded Open Street Map points of interests in the article The Most Popular Pub Names — which compares PostgreSQL with MongoDB for simple geographical queries, and is part of our PostgreSQL Extensions article series. In today’s article, look at how to geolocalize an IP address and locate the nearest pub, all within a single SQL query! For that, we are going to use the awesome ip4r


PostGIS

Don't store lat and long on a table like that. Instead use an PostGIS geometry or geography type.

CREATE EXTENSION postgis;

CREATE TABLE foo (
  geog geography;
);

CREATE INDEX ON foo USING gist(geog);

INSERT INTO foo (geog)
  VALUES (ST_MakePoint(x,y));

Now when you need to query it, you can use KNN (<->) which will actually do this on an index.

SELECT *
FROM foo
ORDER BY foo.geog <-> ST_MakePoint(x,y)::geography;

In your query, you explicitly have HAVING distance < 5. You can do that on the index too.

SELECT *
FROM foo
WHERE ST_DWithin(foo.geog, ST_MakePoint(x,y)::geography, distance_in_meters)
ORDER BY foo.geog <-> ST_MakePoint(x,y)::geography;

This ensure that nothing is returned if all points lie outside of distance_in_meters.

Furthermore x and y are decimal numbers ST_MakePoint(46.06, 14.505)

How to find the nearest lat and lang in postgresql, yes i got the output with this query, and thank you to all who tried to help me:) select * from (SELECT *,( 3959 * acos( cos( radians(6.414478) )  Where can I get a table of locations with latitudes and longitudes, you ask? Do an internet search for “free zipcode download” or “free postcode download.” Then get that loaded into a MySQL table. There are free downloads for plenty of different types of geographic data with latitude and longitude location attached.


See this gist, you will find how to declare a DOMAIN on the point type and how to override the distance operator to return the orthodromic distance.

Declare a latlong type inherited from point:

CREATE DOMAIN latlong AS point CHECK (VALUE[0] BETWEEN -90.0 AND 90.0 AND VALUE[1] BETWEEN -180 AND 180);

The orthodromic distance in kilometers (distance on a sphere with the earth radius):

CREATE OR REPLACE FUNCTION orthodromic_distance(latlong, latlong) RETURNS float AS $_$
     SELECT acos(
              sin(radians($1[0])) 
            * 
              sin(radians($2[0]))
            + 
              cos(radians($1[0])) 
            * 
              cos(radians($2[0]))
            * 
              cos(radians($2[1]) 
            - 
              radians($1[1]))
            ) * 6370.0;
$_$ LANGUAGE sql IMMUTABLE;

Override the distance operator <-> using this function when used with latlongs:

CREATE OPERATOR <-> ( PROCEDURE = orthodromic_distance
, LEFTARG = latlong, RIGHTARG = latlong
);

Now in your SQL queries, to find the nearest entities:

WITH
  station_distance AS (
    SELECT
      id AS station_id,
      point(lat, long)::latlong <-> point(6.414478, 12.466646)::latlong AS distance
    FROM station_location
    WHERE NOT is_deleted
  )
  SELECT
    sl.state_name,
    sl.country_name,
    sl.locality,
    point(sl.lat, sl.long)::latlong AS coordinates,
    sd.distance
  FROM
    station_location sl
    JOIN station_distance sd
      ON sd.station_id = sl.id
  ORDER BY
    distance ASC
  LIMIT 10

You probably want to store the position lat and long in the same field using the latlong type.

Geolocation with PostgreSQL, The location in the CSV file is given as two separate fields latitude and longitude , which we use to form a single point column. to make an application to help lost souls find the nearest pub from where they are currently? 3. Preparing nearest locations query. Now, to answer the second question that we made previously of "How to know when a location is inside the search radius?", a location will be inside the radius as long as the distance between the initial point (Red Marker, Bucaramanga) and the location (Some Flag) is less than the defined search radius (150).


The manual clarifies :

An output column's name can be used to refer to the column's value in ORDER BY and GROUP BY clauses, but not in the WHERE or HAVING clauses; there you must write out the expression instead.

How to find nearest locations from a collection of coordinates , In this article, we will explain you how to know the nearest location by a name and contain the coordinates of latitude and longitude. The SQL query to achieve this will be different if you are working in Kilometers or Miles:  PostGIS is a geospatial database extension of PostgreSQL. This technology can be used to find geometry, longitude, latitude, distance, and other measures. Some of its features, namely geometric


You can use PostgreSQL's cube and earthdistance extensions.

Enable them like this:

CREATE EXTENSION cube;
CREATE EXTENSION earthdistance;

Let's say your current location is 35.697933, 139.707318. Then your query will be something like this:

SELECT *, point(35.697933, 139.707318) <@>  (point(longitude, latitude)::point) as distance
FROM station_location
-- WHERE (point(35.697933, 139.707318) <@> point(longitude, latitude)) < 3
ORDER BY distance;

Please note that the distance is in miles (by default).

latitude/longitude find nearest latitude/longitude, I have latitude and longitude and I want to pull the record from the database, which has nearest place name city country state zip sealevel. The coordinates finder will get latitude and longitude from any address. Search any address from your current coordinates or any other GPS coordinates on the map. Go to gps coordinates converter, type in the lat and long coordinates and click on the Get Address button to find address from my latitude and longitude coordinates. Convert any address using the sexagesimal GPS coordinates by clicking on the Get Address button on the coordinates converter page.


Fast nearest-location finder for SQL (MySQL , Find places fast by latitude/longitude in SQL with bounding latitudes and longitudes, which of those locations are nearest to a given location? You can search for a place using a city's or town's name, as well as the name of special places, and the correct lat long coordinates will be shown at the bottom of the latitude longitude finder form. At that, the place you found will be displayed with the point marker centered on map.


Closest longitude and latitude from PostGIS?, How can I find the closest road segment? For me, I am importing roads.sh (​shape file). Regards. Cite I used above query via JDBC to connect with postgresql/postgis. my gps coordinates i.e. Latitude/Longitude:31.788431/​35.223923. To find an address from a latitude and longitude coordinate pair enter the coordinates into their corresponding fields (LAT for latitude and LNG for longitude). The coordinates fields accept degrees decimal, degrees minutes decimal or degrees minutes and seconds decimal. Click or type return/enter to submit.


Documentation: 9.1: earthdistance, Functions are provided to support input in latitude and longitude (in degrees), output of latitude and longitude, to calculate the great circle distance between two Returns the location of a point on the surface of the Earth given its latitude  Address field - enter an address, city, state, place name, postal code or any other name for a location into this field, select "North America" or "Europe" from the region menu, and then click the find button to retrieve its latitude-longitude coordinate pair. Your result will be displayed in the box either under or to the right of the find button (depending on the width of the device you're viewing this on).