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> Reference material for ST_ASEWKB function

# ST_ASEWKB

Converts shapes of the `GEOGRAPHY` data type to the [extended Well-Known Binary (EWKB)](https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry#Format_variations) format using Spatial Reference Identifier (SRID) 4326, which corresponds to the [WGS84](https://en.wikipedia.org/wiki/World_Geodetic_System#WGS_84) coordinate system.

## Syntax

```sql theme={"theme":{"light":"css-variables","dark":"css-variables"}}
ST_ASEWKB(<object>)
```

## Parameters

| Parameter  | Description                                       | Supported input types |
| :--------- | :------------------------------------------------ | :-------------------- |
| `<object>` | The `GEOGRAPHY` object to convert to EWKB format. | `GEOGRAPHY`           |

## Return Type

`ST_ASEWKB` returns a value of type `BYTEA`.

## Example

The following code example creates a `GEOGRAPHY` object from the WKT representation of a Point at specified longitude and latitude coordinates and converts it to EWKB format:

<div className="query-window">
  ```
  SELECT ST_ASEWKB(ST_GEOGFROMTEXT('POINT(-73.98551041593687 40.75793403395676)')) AS result;
  ```

  | result <span>bytea</span>                            |
  | :--------------------------------------------------- |
  | \x0101000020e61000003d94479a127f52c0502f80fb03614440 |

  <p><span>Rows: 1</span><span>Execution time: 5.85ms</span></p>
</div>