Uploaded on 2018-11-11 by Vânia Abreu

1)Visible information: sky, cloud, Guaiba lake, Beira Rio stadium, antennas, buildings, trees, hill, lighting 2)Invisible information: people in the Beira Rio Stadium, water pollution of the Guaiba lake 3)The number of people in the Beira Rio Stadium can be known by registering at each event. For example, on 10/14/2018 the registered public was 45,263 people. It could also be known the time each person entered the stadium.