Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# H3\$1Center
<a name="H3_Center-function"></a>

H3\$1Center returns the centroid of an H3 cell ID from an input index. For information about H3 indexing, see [H3](spatial-terminology.md#spatial-terminology-h3).

## Syntax
<a name="H3_Center-function-syntax"></a>

```
H3_Center(index)
```

## Arguments
<a name="H3_Center-function-arguments"></a>

 *index*   
A value of data type `BIGINT` or `VARCHAR` that represents the index of an H3 cell. Or, an expression that evaluates to one of these data types.

## Return type
<a name="H3_Center-function-return"></a>

`POINT` – represents the centroid of the H3 cell with spatial reference system identifier (SRID) of `0`.

If *index* is not valid, then an error is returned.

## Examples
<a name="H3_Center-function-examples"></a>

The following SQL inputs a `VARCHAR` that represents the index of an H3 cell, and returns a POINT with SRID of 0 that represents the centroid of the input H3 cell.

```
SELECT H3_Center('8025fffffffffff');
```

```
 h3_center
--------------------------------------------
 010100000070707A550B605940AEE9D70B327E4640
```

The following SQL inputs a `BIGINT` that represents the index of an H3 cell, and returns a POINT with SRID 0 that represents the centroid of the input H3 cell.

```
SELECT H3_Center(577129255373111295);
```

```
 h3_center
--------------------------------------------
 010100000070707A550B605940AEE9D70B327E4640
```

The following SQL inputs a `VARCHAR` that represents the index of an H3 cell, and returns a POINT with SRID 0 that represents the centroid of the input H3 cell. The output of H3\$1Center is input to ST\$1AwEWKT to display in extended well-known text (EWKT) representation.

```
SELECT ST_AsEWKT(H3_Center('8075fffffffffff'));
```

```
 st_asewkt
-----------------------------------------
POINT(-5.24539029677733 2.30088211162675)
```