geo_point_in_circle()geo_point_in_circle()

• 08/06/2020
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计算地理空间坐标是否在地球上的某个圆圈范围内。Calculates whether the geospatial coordinates are inside a circle on Earth.

语法Syntax

geo_point_in_circle(p_longitude, p_latitude, pc_longitude, pc_latitude, c_radius)geo_point_in_circle(p_longitude, p_latitude, pc_longitude, pc_latitude, c_radius)

参数Arguments

• p_longitude：地理空间坐标经度值（度）。p_longitude: 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].
• p_latitude：地理空间坐标纬度值（度）。p_latitude: 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].
• pc_longitude：圆心地理空间坐标经度值（度）。pc_longitude: Circle center 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].
• pc_latitude：圆心地理空间坐标纬度值（度）。pc_latitude: circle center 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].
• c_radius：以米为单位的圆半径。c_radius: Circle radius in meters. 有效值必须为正。Valid value must be positive.

返回Returns

指示地理空间坐标是否在某个圆圈范围内。Indicates whether the geospatial coordinates are inside a circle. 如果坐标或圆圈无效，则查询将生成 null 结果。If the coordinates or circle is invalid, the query will produce a null result.

示例Examples

以下查询会查找由以下圆圈定义的区域中的所有位置：半径为 18 km，中心处于 [-122.317404, 47.609119] 坐标。The following query finds all the places in the area defined by the following circle: Radius of 18 km, center at [-122.317404, 47.609119] coordinates.

datatable(longitude:real, latitude:real, place:string)
[
    real(-122.317404), 47.609119, 'Seattle',                   // In circle 
    real(-123.497688), 47.458098, 'Olympic National Forest',   // In exterior of circle  
    real(-122.201741), 47.677084, 'Kirkland',                  // In circle
    real(-122.443663), 47.247092, 'Tacoma',                    // In exterior of circle
    real(-122.121975), 47.671345, 'Redmond',                   // In circle
]
| where geo_point_in_circle(longitude, latitude, -122.317404, 47.609119, 18000)
| project place

奥兰多的暴风雨事件。Storm events in Orlando. 事件在奥兰多坐标内按 100 km 进行筛选，并且按事件类型和哈希进行聚合。The events are filtered by 100 km within Orlando coordinates, and aggregated by event type and hash.

StormEvents
| project BeginLon, BeginLat, EventType
| where geo_point_in_circle(BeginLon, BeginLat, real(-81.3891), 28.5346, 1000 * 100)
| summarize count() by EventType, hash = geo_point_to_s2cell(BeginLon, BeginLat)
| project geo_s2cell_to_central_point(hash), EventType, count_
| render piechart with (kind=map) // map rendering available in Kusto Explorer desktop

以下示例显示在特定位置 10 米内的纽约出租车载客。The following example shows NY Taxi pickups within 10 meters of a particular location. 相关载客按哈希进行聚合。Relevant pickups are aggregated by hash.

nyc_taxi
| project pickup_longitude, pickup_latitude
| where geo_point_in_circle( pickup_longitude, pickup_latitude, real(-73.9928), 40.7429, 10)
| summarize by hash = geo_point_to_s2cell(pickup_longitude, pickup_latitude, 22)
| project geo_s2cell_to_central_point(hash)
| render scatterchart with (kind = map) // map rendering available in Kusto Explorer desktop

以下示例会返回 true。The following example will return true.

print in_circle = geo_point_in_circle(-122.143564, 47.535677, -122.100896, 47.527351, 3500)

以下示例会返回 false。The following example will return false.

print in_circle = geo_point_in_circle(-122.137575, 47.630683, -122.100896, 47.527351, 3500)

以下示例由于坐标输入无效而返回 null 结果。The following example will return a null result because of the invalid coordinate input.

print in_circle = geo_point_in_circle(200, 1, 1, 1, 1)

以下示例由于圆半径输入无效而返回 null 结果。The following example will return a null result because of the invalid circle radius input.

print in_circle = geo_point_in_circle(1, 1, 1, 1, -1)