Recently I have posted quite a number of panos for my city Freiburg. All of them have been selected for Google Earth. Now I noticed that the icons for this panoramas do only show up, when one does zoom in quite extremly. WIth a normal zoom level there are only very few panos visible in Freiburg and all of mine are completely invisible. What exactly is the reason for that? So far I have not found any explanation on 360cities.