Hi
I need your suggestions regarding my project "Intelligent route navigation system using gps".
Basically its a pocket pc pda application .
1)When user enters a destination address ,the application should display a map with the current route the user is travelling ,estimated time and distance[from his current location] to reach his destination, turn by turn routes,points of interest and so on.
2) Also most importantly the application should guide and warn the user intelligently the route to take if the user is not travelling right directions to reach his destination.

I am planning to develop this application using visual studio.net compact framework [pocket pc environment] 2003. and also gps.net sdk. ,map point webservice 3.5

I am not getting how to do map and route comparisons to guide the user intelligently...

Any ideas/suggestions are greatly appreciated.

Thanks in advance

I think your core problem is locating current GPS position on the route. And detecting if the position has deviated too far.

In some ways this gets back to digitising routes (cf. similar post today).
You might be able to detect which route segment the driver is on, by finding the distance from the GPS location to each of the route segments. You probably also want to check if they're going in the right direction on the road concerned - I suspect that is particularly difficult! Perhaps by taking two positions separated by a minute and doing comparisons with the different route segments (is it closer to the next segment rather than the last segment??).


Richard