Perimeter（周长（Perimeter））¶

Supported in: Batch, Streaming

Calculates perimeter of a geometry in meters using a spherical approximation of the globe. For a line string or a point, this equals 0.

Expression categories: Geospatial

Declared arguments¶

Expression: GeoJSON string.
Expression\

Output type: Double

Examples¶

Example 1: Base case¶

Argument values:

Expression: geometry

geometry	Output
{"type":"Polygon","coordinates":[[[-102.05,41.0],[-109.05,41.0],[-109.05,37.0],[-102.05,37.0],[-102.05,41.0]]]}	2098333.448556529

Example 2: Base case¶

Argument values:

Expression: geometry

geometry	Output
{"type":"MultiPolygon","coordinates":[[[[-102.05,41.0],[-109.05,41.0],[-109.05,37.0],[-102.05,37.0],[-102.05,41.0]]],[[[-1.0,-1.0],[1.0,-1.0],[1.0,1.0],[-1.0,1.0],[-1.0,-1.0]]]]}	2987826.341349821

Example 3: Base case¶

Argument values:

Expression: geometry

geometry	Output
{"type":"Polygon","coordinates":[[[-1.0,-1.0],[1.0,-1.0],[1.0,1.0],[-1.0,1.0],[-1.0,-1.0]]]}	889492.8927932923

Example 4: Null case¶

Argument values:

Expression: geometry

geometry	Output
null	null

Example 5: Edge case¶

Argument values:

Expression: geometry

geometry	Output
not geoJson	null

Example 6: Edge case¶

Argument values:

Expression: geometry

geometry	Output
{"type":"LineString","coordinates":[[0.0,0.0],[1.0,0.0]]}	0.0

Example 7: Edge case¶

Argument values:

Expression: geometry

geometry	Output
{"type":"Point","coordinates":[0.0,0.0]}	0.0

Example 8: Edge case¶

Argument values:

Expression: geometry

geometry	Output
{"type":"Polygon","coordinates":[[[-179.0,-1.0],[179.0,-1.0],[179.0,1.0],[-179.0,1.0],[-179.0,-1.0]]]}	889492.8927932923

中文翻译¶

周长（Perimeter）¶

支持：批处理（Batch）、流处理（Streaming）

使用球体近似法计算几何图形以米为单位的周长。对于线串或点，计算结果为 0。

表达式类别： 地理空间（Geospatial）

声明的参数¶

表达式： GeoJSON 字符串。
表达式\

输出类型： 双精度浮点数（Double）

示例¶

示例 1：基本情况¶

参数值：

表达式： geometry

geometry	输出
{"type":"Polygon","coordinates":[[[-102.05,41.0],[-109.05,41.0],[-109.05,37.0],[-102.05,37.0],[-102.05,41.0]]]}	2098333.448556529

示例 2：基本情况¶

参数值：

表达式： geometry

geometry	输出
{"type":"MultiPolygon","coordinates":[[[[-102.05,41.0],[-109.05,41.0],[-109.05,37.0],[-102.05,37.0],[-102.05,41.0]]],[[[-1.0,-1.0],[1.0,-1.0],[1.0,1.0],[-1.0,1.0],[-1.0,-1.0]]]]}	2987826.341349821

示例 3：基本情况¶

参数值：

表达式： geometry

geometry	输出
{"type":"Polygon","coordinates":[[[-1.0,-1.0],[1.0,-1.0],[1.0,1.0],[-1.0,1.0],[-1.0,-1.0]]]}	889492.8927932923

示例 4：空值情况¶

参数值：

表达式： geometry

geometry	输出
null	null

示例 5：边界情况¶

参数值：

表达式： geometry

geometry	输出
非 geoJson 格式	null

示例 6：边界情况¶

参数值：

表达式： geometry

geometry	输出
{"type":"LineString","coordinates":[[0.0,0.0],[1.0,0.0]]}	0.0

示例 7：边界情况¶

参数值：

表达式： geometry

geometry	输出
{"type":"Point","coordinates":[0.0,0.0]}	0.0

示例 8：边界情况¶

参数值：

表达式： geometry

geometry	输出
{"type":"Polygon","coordinates":[[[-179.0,-1.0],[179.0,-1.0],[179.0,1.0],[-179.0,1.0],[-179.0,-1.0]]]}	889492.8927932923