A patent has been issued for this device, which would conserve space in burial grounds.  The inventor even envisions a transparent variety:

“A clear plastic Easy Inter Burial Container, where the body is additionally encased in clear resin and is standing erect for all to view during installation, creates a very impressive image.”

The screwing-into-the-ground would be performed either by humans or by an adaptation on a tractor backhoe.

Link, via.