def update_variables_metadata(grid):
    """
    Update metadata of the gridded variables.

    Parameter:
    ==========
    grid: pyart.core.Grid
        Gridded radar data.

    Returns:
    ========
    grid: pyart.core.Grid
        Gridded radar data with updated variables metadata.
    """
    try:
        grid.fields["corrected_velocity"]["standard_name"] = "radial_velocity_of_scatterers_away_from_instrument"
    except KeyError:
        pass

    grid.radar_latitude["standard_name"] = "latitude"
    grid.radar_latitude["coverage_content_type"] = "coordinate"
    grid.radar_longitude["standard_name"] = "longitude"
    grid.radar_longitude["coverage_content_type"] = "coordinate"
    grid.radar_altitude["standard_name"] = "altitude"
    grid.radar_altitude["coverage_content_type"] = "coordinate"
    grid.radar_time["standard_name"] = "time"
    grid.radar_time["coverage_content_type"] = "coordinate"

    grid.point_latitude["standard_name"] = "latitude"
    grid.point_latitude["coverage_content_type"] = "coordinate"
    grid.point_longitude["standard_name"] = "longitude"
    grid.point_longitude["coverage_content_type"] = "coordinate"
    grid.point_altitude["standard_name"] = "altitude"
    grid.point_altitude["coverage_content_type"] = "coordinate"

    return grid