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

This tool takes a polygon vector layer representing hedges and a Digital Height Model (DHM) and computes descriptive height statistics.

```{admonition} Remark
:class: remarque
The height statistics reflect the DHM values, which only capture the vegetation canopy and provide no information about the internal structure of the hedge.
```

## Parameters

| Label | Name | Type | Description |
|-------|------|------|-------------|
| Input polygon layer | `INPUT` | [vector: polygon] | Polygon vector layer representing the hedges. |
| Input height raster (DHM) | `RASTER` | [raster] | Digital Height Model representing the height of objects above ground. |
| Height band | `BAND` | [raster band] <br> Default: 1 | Height band of the DHM raster in case of multiband. |
| Output height layer | `OUTPUT` | [vector: polygon] <br> Default: `[Create temporary layer]` | Output polygon vector layer. |

## Outputs

| Label | Name | Type | Description |
|-------|------|------|-------------|
| Output height layer | `OUTPUT` | [vector: polygon] | Polygon vector layer with five new fields: `height_mean` (mean height), `height_median` (median height), `height_min` (minimum height), `height_max` (maximum height), and `height_std` (standard deviation of height). |