LAB 13

1. Observe how Google Mars loads the map and does the zooming. Is the data downloaded once
   
for all or retrieved on demand?

I think it is the data downloaded once , or it'll not to show such quickly.


 2. 這個服務的特色有哪些?

可以自如的放大縮小，且畫面十分清晰，速度又非常快，還有其他檢索列表，

像地形或故事