geo_s2cell_to_central_point()geo_s2cell_to_central_point()

• 08/06/2020
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计算表示 S2 单元格中心的地理空间坐标。Calculates the geospatial coordinates that represent the center of an S2 cell.

详细了解 S2 单元格层次结构。Read more about S2 cell hierarchy.

语法Syntax

geo_s2cell_to_central_point(s2cell)geo_s2cell_to_central_point(s2cell)

参数Arguments

s2cell：由 geo_point_to_s2cell() 计算得出的 S2 单元格令牌字符串值。s2cell: S2 cell token string value as it was calculated by geo_point_to_s2cell(). S2 单元格令牌的最大字符串长度为 16 个字符。The S2 cell token maximum string length is 16 characters.

返回Returns

地理空间坐标值采用 GeoJSON 格式，属于动态数据类型。The geospatial coordinate values in GeoJSON Format and of a dynamic data type. 如果 S2 单元格令牌无效，则查询会生成 null 结果。If the S2 cell token is invalid, the query will produce a null result.

示例Examples

print point = geo_s2cell_to_central_point("1234567")
| extend coordinates = point.coordinates
| extend longitude = coordinates[0], latitude = coordinates[1]

下面的示例由于 S2 单元格令牌输入无效而返回 null 结果。The following example returns a null result because of the invalid S2 cell token input.

print point = geo_s2cell_to_central_point("a")