Question : Vehicle Tracking Simulation

Hi

I've created a real time tracking system (already asked questions on that Q_21366955.html) and its kind of working ok. But this relies on an actual GPS device. The program created needs to be demonstrated so i wish to create a simulation for it.

This is what i want:
- The user selects a starting and ending point on a map (each longitude and latitude coordinates)
- then using stored roads in a database navigate its way to the end point (Program somehow works out which is the nearest road and goes to that road, then uses that road to go to as close to the end point as possible, then searches nearest road again etc) don't know if thats a good method its just how i thought it would happen in my head.

I've done a simple simulation which has the start and end points and then increments/decrements the longitude and latitude values and thats it.

I want to include a database or roads, this will only be small to start off with for demo purposes, so for example main roads in the local area.

Then i want to include the speed of actuall movement and maybe congestion values in certain areas e.g 10 for high congestion.

Want to know:
- Is incrementing or decrementing long and lat values a good method or not?? any better ways??
- how is a typical road database structured??
- how would i calculate speed??
- How would congestion be included and implemented??

Well any info on this area would be helpful and its urgent and in my view difficult so 500 points will be given.

Hope to receive info and advice from you soon.

Thanks experts

Anthony

Answer : Vehicle Tracking Simulation

Have a look to this ready made NMEA GPS simulator:
http://www.sailsoft.nl/gpssimul.htm