# As

```go
func As[T proto.Message](seq iter.Seq2[[]byte, error]) iter.Seq2[T, error]
```

Convert a sequence of bytes into a sequence of `proto.Message`.

Useful to convert the output of [`Datapoints.Query`](/docs/api-reference/go/datasets/Datapoints.Query) into a sequence of `proto.Message`.

## Parameters

**seq**

`iter.Seq2[[]byte, error]`

The sequence of bytes to convert

## Returns

A sequence of `proto.Message` or an error if any.

```go title="Go"
import (
  "time"
  datasets "github.com/tilebox/tilebox-go/datasets/v1"
	"github.com/tilebox/tilebox-go/query"
)

startDate := time.Date(2014, 10, 4, 0, 0, 0, 0, time.UTC) 
endDate := time.Date(2021, 2, 24, 0, 0, 0, 0, time.UTC) 
queryInterval := query.NewTimeInterval(startDate, endDate)

seq := datasets.As[*v1.Sentinel1Sar](
    client.Datapoints.Query(
      ctx,
      datasetID,
      datasets.WithCollectionIDs(collectionID),
      datasets.WithTemporalExtent(queryInterval),
    ),
)
```