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数据连接与集成PB函数表达式在折线段上插值地理点

注意：以下翻译的准确性尚未经过验证。这是使用 AIP ↗ 从原始英文文本进行的机器翻译。

在折线段上插值地理点

支持于: 批处理, 流处理

返回沿线插值的点。实现将线解释为最短路径，使用地球的球形近似。

表达式类别: 地理空间

声明的参数

  • Fraction - 在折线段总长度上从起始点开始抽取地理点的比例。必须是介于0和1之间的浮点数。
    表达式<Decimal | Double | Float>
  • Linestring - 用于插值地理点的折线段。
    表达式<Geometry>

输出类型: GeoPoint

示例

示例 1: 基本情况

参数值:

  • Fraction: fraction
  • Linestring: linestring
linestringfraction输出
{"type":"LineString","coordinates":[[0.0,2.0],[30.0,0.0]]}0.5{
 latitude: 1.0352686301676643,
 longitude: 15.004677545504547,
}
{"type":"LineString","coordinates":[[30.0,2.0],[50.0,3.0]]}0.8{
 latitude: 2.8256098405656185,
 longitude: 45.99752305664789,
}
{"type":"LineString","coordinates":[[45.0,9.0],[90.0,4.0]]}0.2{
 latitude: 8.363732883448177,
 longitude: 54.073497456494955,
}

示例 2: 基本情况

参数值:

  • Fraction: fraction
  • Linestring: linestring
linestringfraction输出
{"type":"LineString","coordinates":[[0.0,2.0],[30.0,0.0]]}0.5{
 latitude: 1.0352686301676643,
 longitude: 15.004677545504547,
}
{"type":"LineString","coordinates":[[30.0,2.0],[50.0,3.0]]}0.8{
 latitude: 2.8256098405656185,
 longitude: 45.99752305664789,
}
{"type":"LineString","coordinates":[[45.0,9.0],[90.0,4.0]]}0.2{
 latitude: 8.363732883448177,
 longitude: 54.073497456494955,
}

示例 3: 基本情况

参数值:

  • Fraction: fraction
  • Linestring: linestring
linestringfraction输出
{"type":"LineString","coordinates":[[0.0,2.0],[30.0,0.0]]}0.5{
 latitude: 1.0352686301676643,
 longitude: 15.004677545504547,
}
{"type":"LineString","coordinates":[[30.0,2.0],[50.0,3.0]]}0.8{
 latitude: 2.825609851378893,
 longitude: 45.99752329517703,
}
{"type":"LineString","coordinates":[[45.0,9.0],[90.0,4.0]]}0.2{
 latitude: 8.363732872387065,
 longitude: 54.0734975914614,
}

示例 4: 空值情况

参数值:

  • Fraction: fraction
  • Linestring: linestring
linestringfraction输出
{"type":"LineString","coordinates":[[10.0,4.0],[75.0,0.0]]}nullnull
{"type":"LineString","coordinates":[[10.0,8.0],[35.0,0.0]]}-0.5null
{"type":"LineString","coordinates":[[10.0,8.0],[35.0,0.0]]}1.6null
{"type":"MultiLineString","coordinates":[[[100.0,0.0]], [[102.0,2.0]]]}0.4null
{"type":"GeometryCollection","geometries":{"type":"LineString","coordinates":[[10.0,4.0]]}}0.5null
null1.0null

示例 5: 边缘情况

描述: Fraction值为0时返回起始点的GeoPoint，Fraction值为1时返回终点的GeoPoint。存在浮点数误差，但应足够精确以满足几乎所有应用案例。 参数值:

  • Fraction: fraction
  • Linestring: linestring
linestringfraction输出
{"type":"LineString","coordinates":[[10.0,4.0],[75.0,0.0]]}0.0{
 latitude: 4.0,
 longitude: 9.999999999999998,
}
{"type":"LineString","coordinates":[[10.0,8.0],[35.0,0.0]]}1.0{
 latitude: 0.0,
 longitude: 35.0,
}
{"type":"LineString","coordinates":[[10.0,8.4],[35.0,0.0],[163.0,67.9]]}1.0{
 latitude: 67.90000000000002,
 longitude: 163.0,
}
{"type":"LineString","coordinates":[[10.0,8.4],[35.0,0.0],[163.0,67.9]]}0.0{
 latitude: 8.400000000000002,
 longitude: 9.999999999999998,
}