geo_distance_2points()

Calculates the shortest distance between two geospatial coordinates on Earth.

Syntax

geo_distance_2points(p1_longitude, p1_latitude, p2_longitude, p2_latitude)

Arguments

• p1_longitude: First geospatial coordinate, longitude value in degrees. Valid value is a real number and in the range [-180, +180].
• p1_latitude: First geospatial coordinate, latitude value in degrees. Valid value is a real number and in the range [-90, +90].
• p2_longitude: Second geospatial coordinate, longitude value in degrees. Valid value is a real number and in the range [-180, +180].
• p2_latitude: Second geospatial coordinate, latitude value in degrees. Valid value is a real number and in the range [-90, +90].

Returns

The shortest distance, in meters, between two geographic locations on Earth. If the coordinates are invalid, the query will produce a null result.

Note

• The geospatial coordinates are interpreted as represented by the WGS-84 coordinate reference system.
• The geodetic datum used to measure distance on Earth is a sphere.

Examples

The following example finds the shortest distance between Seattle and Los Angeles.

print distance_in_meters = geo_distance_2points(-122.407628, 47.578557, -118.275287, 34.019056)

distance_in_meters
1546754.35197381

Here is an approximation of shortest path from Seattle to London. The line consists of coordinates along the LineString and within 500 meters from it.

range i from 1 to 1000000 step 1
| project lng = rand() * real(-122), lat = rand() * 90
| where lng between(real(-122) .. 0) and lat between(47 .. 90)
| where geo_distance_point_to_line(lng,lat,dynamic({"type":"LineString","coordinates":[[-122,47],[0,51]]})) < 500
| render scatterchart with (kind=map)

The following example finds all rows in which the shortest distance between two coordinates is between 1 and 11 meters.

StormEvents
| extend distance_1_to_11m = geo_distance_2points(BeginLon, BeginLat, EndLon, EndLat)
| where distance_1_to_11m between (1 .. 11)
| project distance_1_to_11m

distance_1_to_11m
10.5723100154958
7.92153588248414

The following example returns a null result because of the invalid coordinate input.

print distance = geo_distance_2points(300,1,1,1)

distance