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

This tool takes a polygon vector layer representing hedges and a line vector layer representing their median axis, and computes the width of each polygon.

## Parameters

| Label | Name | Type | Description |
|-------|------|------|-------------|
| Input polygon layer | `INPUT_POLYGON` | [vector: polygon] | Polygon vector layer representing the hedges. |
| Input arc layer | `INPUT_ARC` | [vector: line] | Line vector layer representing the hedge median axis. |
| Width method | `METHOD` | [enumeration] | Method used to compute width:<ul><li>0: **Accurate** – Computes perpendicular transects along the median axis and measures their length.</li><li>1: **Approximate** – Computes the distance from the median axis to the closest polygon boundary and multiplies it by 2.</li></ul> |
| Sampling distance (meters) | `DISTANCE` | [numeric: integer] <br> Default: 10 | Interval along the median axis used for width sampling. |
| Percentile for outlier removal | `PERCENTILE` | [numeric: integer] <br> Optional | Removes extreme width values using the IQR method with the specified percentile before computing summary statistics. |
| Output width layer | `OUTPUT` | [vector: polygon] <br> Default: `[Create temporary layer]` | Output polygon vector layer. |

## Outputs

| Label | Name | Type | Description |
|-------|------|------|-------------|
| Output width layer | `OUTPUT` | [vector: polygon] | Polygon vector layer with five new fields per selected method: `width_method_mean` (mean width), `width_method_med` (median width), `width_method_min` (minimum width), `width_method_max` (maximum width), and `width_method_std` (standard deviation of width). Where `method` is either `acc` or `approx`. |