We went to visit the Institute of Space and Earth Information Science ( UC Ball ) in the third day afternoon. Dr. Pang told us more about GPS. We also used the GPS to measure the area difference between Hong Kong Disneyland and Calfornia Disneyland. He even showed a system that can watch the buildings by bird-view! He said that the system can let people get the correct way to their destination.

After that, we visited the satellite station in the university. There were a lot of computers there. The ball-shaped figure around the satellite can protect it from rains. We learnt lots of things about GPS in this visiting.