If not already done, create the authorization object. See Example: Create an Authorization Object.
Run the READ_NOS command:
SELECT * FROM ( LOCATION='/s3/td-usgs-public.s3.amazonaws.com/JSONDATA/' AUTHORIZATION=MyAuthObj RETURNTYPE='NOSREAD_SCHEMA' ) AS d;
Your result will be similar to the following:
ColPosition NULL Name site_no DataType int Depth 1 NullFound F FileType json Location /S3/s3.amazonaws.com/td-usgs-public/JSONDATA/09513780/2018/06/27.json ColPosition NULL Name datetime DataType TIMESTAMP(0) FORMAT'Y4-MM-DDBHH:MI' Depth 1 NullFound F FileType json Location /S3/s3.amazonaws.com/td-usgs-public/JSONDATA/09513780/2018/06/27.json
The output is displayed vertically for readability.