# Grouped geometry union

> Supported in: Batch

Combines the grouped geometries to create a single geometry.

**Expression categories:** Geospatial

## Declared arguments

* **Expression:** The column of geometries to combine.<br>*Expression\<Geometry>*

**Output type:** *Geometry*

## Examples

### Example 1: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"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":\[\[\[0.5,0.0],\[1.5,0.0],\[1.5,1.0],\[0.5,1.0],\[0.5,0.0]]]} |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[0.0,0.0],\[0.0,1.0],\[0.5,1.0],\[1.0,1.0],\[1.5,1.0],\[1.5,0.0],\[1.0,0.0],\[0.5,0.0],\[0.0,0.0]]]}

***

### Example 2: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"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":\[\[\[0.0,0.0],\[0.0,1.0],\[1.0,1.0],\[1.0,0.0],\[0.0,0.0]],\[\[0.25,0.25],\[0.5,0.25],\[0.5,0.5],\[0.25,0.5],\[0.25,0.25]]]} |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[0.0,0.0],\[0.0,1.0],\[1.0,1.0],\[1.0,0.0],\[0.0,0.0]]]}

***

### Example 3: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"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":\[\[\[5.0,5.0],\[5.0,6.0],\[6.0,6.0],\[6.0,5.0],\[5.0,5.0]]]} |

**Outputs:** {"type":"MultiPolygon","coordinates":\[\[\[\[0.0,0.0],\[0.0,1.0],\[1.0,1.0],\[1.0,0.0],\[0.0,0.0]]],\[\[\[5.0,5.0],\[5.0,6.0],\[6.0,6.0],\[6.0,5.0],\[5.0,5.0]]]]}

***

### Example 4: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"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]]]} |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[0.0,0.0],\[0.0,1.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0],\[0.0,0.0]]]}

***

### Example 5: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]} |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]} |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]}

***

### Example 6: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]} |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]}

***

### Example 7: Base case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"type":"LineString","coordinates":\[\[0.0,0.0],\[1.0,0.0]]} |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]} |

**Outputs:** {"type":"GeometryCollection","geometries":\[{"type":"LineString","coordinates":\[\[0.0,0.0],\[1.0,0.0]]},{"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]}]}

***

### Example 8: Null case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]} |
| *null* |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]}

***

### Example 9: Edge case

**Argument values:**

* **Expression:** `geometry`

**Given input table:**

| geometry |
| ----- |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]} |
| {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0]]]} |

**Outputs:** {"type":"Polygon","coordinates":\[\[\[1.0,0.0],\[1.0,1.0],\[2.0,1.0],\[2.0,0.0],\[1.0,0.0]]]}

***