Get closest x, y and z for the given `x` and `y` in `data` for
        1d coords

def get_xyz_tri(self, xcoord, x, ycoord, y, u, v):
        """Get closest x, y and z for the given `x` and `y` in `data` for
        1d coords"""
        return self.get_xyz_2d(xcoord, x, ycoord, y, u, v)