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# ST_SimplifyPolygonHull (Python)

> Simplify a geometry using Visvalingam-Whyatt algorithm within a specified tolerance while preserving topological relationships.

Simplify a geometry using Visvalingam-Whyatt algorithm within a specified tolerance while preserving topological relationships.

SQL reference: [`ST_SimplifyPolygonHull`](/reference/wherobots-db/geometry-data/processing/ST_SimplifyPolygonHull)

## Signature

```python theme={"system"}
from sedona.spark.sql.st_functions import ST_SimplifyPolygonHull

ST_SimplifyPolygonHull(
    geometry: ColumnOrName,
    vertexFactor: ColumnOrNameOrNumber,
    isOuter: Optional[Union[ColumnOrName, bool]] = None,
) -> Column
```

## Parameters

<ParamField path="geometry" type="ColumnOrName" required>
  Geometry column to simplify.
</ParamField>

<ParamField path="vertexFactor" type="ColumnOrNameOrNumber" required>
  Tolerance for merging points together to simplify the geometry as either a number or numeric column.
</ParamField>

<ParamField path="isOuter" type="Optional[Union[ColumnOrName, bool]]" default="None" />

## Returns

<ResponseField name="return" type="Column">
  Simplified geometry as a geometry column.
</ResponseField>


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