geo_distance_2points()

Applies to: ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Calculates the shortest distance in meters between two geospatial coordinates on Earth.

Syntax

geo_distance_2points(p1_longitude,p1_latitude,p2_longitude,p2_latitude,[ use_spheroid ])

Learn more about syntax conventions.

Parameters

Name Type Required Description
p1_longitude real ✔️ The longitude value in degrees of the first geospatial coordinate. A valid value is in the range [-180, +180].
p1_latitude real ✔️ The latitude value in degrees of the first geospatial coordinate. A valid value is in the range [-90, +90].
p2_longitude real ✔️ The longitude value in degrees of the second geospatial coordinate. A valid value is in the range [-180, +180].
p2_latitude real ✔️ The latitude value in degrees of the second geospatial coordinate. A valid value is in the range [-90, +90].
use_spheroid bool If false will use a sphere as geodetic datum for measuring distance. If true will measure distance using spheroid. If unspecified, the default value false is used.

Returns

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

Note

  • The geospatial coordinates are interpreted as represented by the WGS-84 coordinate reference system.
  • Most applications should measure distance using sphere ('use_spheroid' = false) which is more performant. If extra precision is needed, 'use_spheroid' option can be set to 'true', for extra precision, which might be more relevant for bigger distances, which might get impacted due to earth curvature.

Examples

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

Distance between Seattle and Los Angeles.

Run the query

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

Output

distance_in_meters
1546754.35197381

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

Run the query

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)

Output

Screenshot of the Seattle to London LineString.

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

Run the query

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

Output

distance_1_to_11m
10.5723100154958
7.92153588248414

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

Run the query

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

Output

distance