how can I build reality based large-scale urban model?

I want to build a district model of a city based on reality. Road,street,bridge,building ...
Like a GIS or 3D map . which the user can place a car and drive it to experience the road or a street view.
Or Place a user at random position and let the user to find the nearest bus-station or post office.

because the map will make sense only when it based on the real(by and large based on the real city.)

So that just the need I just don't know how to build that model , and I know it will be massive and maybe impossible only by hands. any Hint?

 

Hi,
Do you plan on basing your scene on OpenStreetMap ou a similar service?

If not, you can look at some videos and tutorials such as those :

The best approach is to create building blocks and then (re)use them everywhere, but when it's not possible, try to find elements that can be repeated and build the remaining. You may also want to try to generate some meshes if you want to base your scene on dynamic data (such as OpenStreetMap).:

I hope it helps

ThunderMusic

 

1.thanks for you timely reply first, "...basing your scene on OpenStreetMap " is free or how to use it ? any example or tutorial?

 

You're welcome.

It seems to be free, but clients can be blocked without notice if they affect the level of service for others or cause data corruption.

Here is the general documentation : http://wiki.openstreetmap.org/wiki/API
Here is the documentation for the current version of the API : http://wiki.openstreetmap.org/wiki/API_v0.6

They use Restful Web services, so it should be pretty straight forward with the HttpWebRequest (https://msdn.microsoft.com/en-us/library/system.net.httpwebrequest(v=vs.80).aspx) and HttpWebResponse (https://msdn.microsoft.com/en-us/library/system.net.httpwebresponse(v=vs.80).aspx) classes.