Lots of information has been surveyed already and entered into the maps through the web among user friendly.?

For example,Google maps,Yahoo maps,Virtual earth etc.

In google maps v have lots of information are there such as considered a city inside of all roads,rivers point of interest include temple, college,ATM,Hospitals,etc.Recently in that road maps google as created street view maps.

MY QUESTION IS...

1.Any other information can be added which should be useful for the public, except the above information.Please use your new creativity and it should be useful for the public.Lots of information has been surveyed already and entered into the maps through the web among user friendly.?
Drainage systems could and should be added, particularly the parts of the drainage system that cannot be seen by the general public because they have been completely channelized under streets or the ground. Even if the maps of the drainage system are outdated, they still have very useful information, especially in areas that have had natural or man-made disasters. I and others wouldn't have to answer questions like does it matter if a particular canal is connected to other canals or not. An unconnected canal is not a canal. It's a holding pond or a small enclosed lake.