> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wherobots.com/llms.txt
> Use this file to discover all available pages before exploring further.

# RS_BandIsNoData

Returns true if the band is filled with only nodata values. Band 1 is assumed if not specified.

## Signatures

```sql theme={"system"}
RS_BandIsNoData(raster: Raster, band: Integer = 1)
```

## Parameters

<ParamField body="raster" type="Raster" required>
  The input raster.
</ParamField>

<ParamField body="band" type="Integer" required default="1">
  The band index.
</ParamField>

## Return type

<ResponseField type="Boolean">
  Returns `true` or `false`.
</ResponseField>

## Example

```sql theme={"system"}
WITH rast_table AS (SELECT RS_AddBandFromArray(RS_MakeEmptyRaster(1, 2, 2, 0, 0, 1), ARRAY(10d, 10d, 10d, 10d), 1, 10d) as rast)
SELECT RS_BandIsNoData(rast) from rast_table
```

```
true
```