# Shape
<!-- <div class="algorithm-id">
<strong>Algorithm ID</strong>: <code>hedgetools:shapemetrics</code>
</div> -->
```{container} algorithm-id
**Algorithm ID**: `hedgetools:shapemetrics`
```

This tool takes a polygon vector layer representing the hedge and computes:

- **elongation**: Indicates the degree of stretching of a polygon. However, this indicator is not very reliable for complex shapes (e.g., U-shaped polygons). Values range between 0 (highly stretched) and 1 (less stretched).
- **compactness**: Indicates the density of a polygon. Values range between 0 (not compact) and 1 (highly compact).
- **convexity**: Indicates the regularity of the polygon's outline, its sphericity. Values range between 0 (non-convex) and 1 (convex).

## Parameters

| Label | Name | Type | Description |
|-------|------|------|-------------|
| Input polygon layer | `INPUT` | [vector: polygon] | Polygon vector layer representing the hedge. |
| Output shape layer | `OUTPUT` | [vector: polygon] <br> Default: `[Create temporary layer]` | Output polygon vector layer. |

## Outputs

| Label | Name | Type | Description |
|-------|------|------|-------------|
| Output shape layer | `OUTPUT` | [vector: polygon] | Polygon vector layer with three new fields: `elongation`, `compactness`, and `convexity`. |