Geometry array line dissolve（几何数组线溶解（Geometry array line dissolve））¶

Supported in: Batch, Faster, Streaming

Given an array of geometries, combine these into a linear geometry. Dissolve simplifies an input set of line-strings by removing unnecessary nodes and concatenating line-strings that can be combined. Z-coordinates will be ignored for the purpose of the dissolve operation, but the vertices in the resultant geometry will have the same z-coordinate as the corresponding points in the input.

Expression categories: Geospatial

Declared arguments¶

Expression: An array of geometries to dissolve.
Expression\>

Type variable bounds: T accepts Geometry

Output type: T

Examples¶

Example 1: Base case¶

Argument values:

Expression: geometries

geometries	Output
[ {"type":"LineString","coordinates":[[0,0],[0,1],[1,1]]}, {"type":"LineString","coordinates":[[1,1]...	{"type":"MultiLineString","coordinates":[[[5.0, 5.0],[4.0, 4.0],[3.0, 3.0],[2.0, 2.0],[1.0, 1.0],[0.0, 1.0],[0.0, 0.0]],[[7.0, 7.0], [6.0, 7.0], [6.0, 6.0]]]}
[ {"type":"LineString","coordinates":[[0,0,1],[0,1,1],[1,1,1]]}, {"type":"LineString","coordinates":[[1,1,1],[2,2,2]]}, {"type":"LineString","coordinates":[[1,1,2],[2,2,2],[3,3,3]]} ]	{"type":"LineString","coordinates":[[0.0, 0.0, 1.0],[0.0, 1.0, 1.0],[1.0, 1.0, 1.0],[2.0, 2.0, 2.0],[3.0, 3.0, 3.0]]}

Example 2: Base case¶

Argument values:

Expression: geometries

geometries	Output
[ {"type":"LineString","coordinates":[[0,0],[0,1],[1,1]]}, {"type":"Polygon","coordinates":[[[2,2],[...	{"type":"MultiLineString","coordinates":[[[3.0, 3.0], [4.0, 4.0], [5.0, 5.0]],[[3.0, 3.0], [3.0, 2.0], [2.0, 2.0], [2.0, 3.0], [3.0, 3.0]],[[0.0, 0.0], [0.0, 1.0], [1.0, 1.0]]]}

Example 3: Base case¶

Argument values:

Expression: geometries

geometries	Output
[ {"type":"Polygon","coordinates":[[[0.0,0.0],[0.0,1.0],[1.0,1.0],[1.0,0.0],[0.0,0.0]]]}, {"type":"Polygon","coordinates":[[[1.0,0.0],[1.0,1.0],[2.0,1.0],[2.0,0.0],[1.0,0.0]]]} ]	{"type":"MultiLineString","coordinates":[[[1.0, 0.0], [1.0, 1.0]],[[1.0, 1.0], [0.0, 1.0], [0.0, 0.0], [1.0, 0.0]],[[1.0, 0.0], [2.0, 0.0], [2.0, 1.0], [1.0, 1.0]]]}

Example 4: Null case¶

Argument values:

Expression: geometries

geometries	Output
[ ]	null
null	null

中文翻译¶

几何数组线溶解（Geometry array line dissolve）¶

支持：批处理（Batch）、快速处理（Faster）、流处理（Streaming）

给定一个几何数组，将其合并为线性几何。溶解操作通过移除不必要的节点并连接可合并的线串，简化输入的线串集合。溶解操作将忽略 Z 坐标，但结果几何中的顶点将保持与输入中对应点相同的 Z 坐标。

表达式类别： 地理空间（Geospatial）

声明的参数¶

表达式（Expression）： 待溶解的几何数组。
表达式\>

类型变量边界： T 接受 Geometry

输出类型： T

示例¶

示例 1：基本情况¶

参数值：

表达式： geometries

geometries	输出
[ {"type":"LineString","coordinates":[[0,0],[0,1],[1,1]]}, {"type":"LineString","coordinates":[[1,1]...	{"type":"MultiLineString","coordinates":[[[5.0, 5.0],[4.0, 4.0],[3.0, 3.0],[2.0, 2.0],[1.0, 1.0],[0.0, 1.0],[0.0, 0.0]],[[7.0, 7.0], [6.0, 7.0], [6.0, 6.0]]]}
[ {"type":"LineString","coordinates":[[0,0,1],[0,1,1],[1,1,1]]}, {"type":"LineString","coordinates":[[1,1,1],[2,2,2]]}, {"type":"LineString","coordinates":[[1,1,2],[2,2,2],[3,3,3]]} ]	{"type":"LineString","coordinates":[[0.0, 0.0, 1.0],[0.0, 1.0, 1.0],[1.0, 1.0, 1.0],[2.0, 2.0, 2.0],[3.0, 3.0, 3.0]]}

示例 2：基本情况¶

参数值：

表达式： geometries

geometries	输出
[ {"type":"LineString","coordinates":[[0,0],[0,1],[1,1]]}, {"type":"Polygon","coordinates":[[[2,2],[...	{"type":"MultiLineString","coordinates":[[[3.0, 3.0], [4.0, 4.0], [5.0, 5.0]],[[3.0, 3.0], [3.0, 2.0], [2.0, 2.0], [2.0, 3.0], [3.0, 3.0]],[[0.0, 0.0], [0.0, 1.0], [1.0, 1.0]]]}

示例 3：基本情况¶

参数值：

表达式： geometries

geometries	输出
[ {"type":"Polygon","coordinates":[[[0.0,0.0],[0.0,1.0],[1.0,1.0],[1.0,0.0],[0.0,0.0]]]}, {"type":"Polygon","coordinates":[[[1.0,0.0],[1.0,1.0],[2.0,1.0],[2.0,0.0],[1.0,0.0]]]} ]	{"type":"MultiLineString","coordinates":[[[1.0, 0.0], [1.0, 1.0]],[[1.0, 1.0], [0.0, 1.0], [0.0, 0.0], [1.0, 0.0]],[[1.0, 0.0], [2.0, 0.0], [2.0, 1.0], [1.0, 1.0]]]}

示例 4：空值情况¶

参数值：

表达式： geometries

geometries	输出
[ ]	null
null	null