# 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.<br>*Expression\<Geometry>*

**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 |

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### 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 |

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### Example 7: Edge case

**Argument values:**

* **Expression:** `geometry`

| geometry | **Output** |
| ----- | ----- |
| {"type":"Point","coordinates":\[0.0,0.0]} | 0.0 |

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### 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 |

***