from typing import Tuple


def grid_to_local(point: Tuple[int, int],
                  altitude: float,
                  north_min: float,
                  east_min: float,
                  cell_size: float
                  ) -> Tuple[float, float, float]:
    """Convert a point from the local grid frame to the local ECEF frame."""

    north = point[0]*cell_size + north_min
    east = point[1]*cell_size + east_min

    return (north, east, altitude)