geo_distance_2points()geo_distance_2points()

• 10/29/2020
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计算两个地理空间坐标在地球上的最短距离。Calculates the shortest distance between two geospatial coordinates on Earth.

语法Syntax

geo_distance_2points(p1_longitude, p1_latitude, p2_longitude, p2_latitude)geo_distance_2points(p1_longitude, p1_latitude, p2_longitude, p2_latitude)

参数Arguments

• p1_longitude：第一个地理空间坐标，经度值（度）。p1_longitude : First geospatial coordinate, longitude value in degrees. 有效值为 [-180, +180] 范围内的实数。Valid value is a real number and in the range [-180, +180].
• p1_latitude：第一个地理空间坐标，纬度值（度）。p1_latitude : First geospatial coordinate, latitude value in degrees. 有效值为 [-90, +90] 范围内的实数。Valid value is a real number and in the range [-90, +90].
• p2_longitude：第二个地理空间坐标，经度值（度）。p2_longitude : Second geospatial coordinate, longitude value in degrees. 有效值为 [-180, +180] 范围内的实数。Valid value is a real number and in the range [-180, +180].
• p2_latitude：第二个地理空间坐标，纬度值（度）。p2_latitude : Second geospatial coordinate, latitude value in degrees. 有效值为 [-90, +90] 范围内的实数。Valid value is a real number and in the range [-90, +90].

返回Returns

地球上两个地理位置之间的最短距离（以米为单位）。The shortest distance, in meters, between two geographic locations on Earth. 如果坐标无效，则查询将生成 null 结果。If the coordinates are invalid, the query will produce a null result.

示例Examples

下面的示例查找西雅图与洛杉矶之间的最短距离。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)

下面是从西雅图到伦敦的最短路径的近似值。Here is an approximation of shortest path from Seattle to London. 该线路由沿线串分布的距其 500 米范围内的坐标组成。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) // map rendering available in Kusto Explorer desktop

以下示例查找其中的两个坐标之间的最短距离在 1 到 11 米之间的所有行。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

下面的示例由于坐标输入无效而返回 null 结果。The following example returns a null result because of the invalid coordinate input.

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