Satnav Maps

[rov1200]

With the fine detail necessary are the maps plotted by hand or are they photographic representations of the area or what?

[ACtheTROLL]

have you got an A-Z?

that's what you get - but coloured in

[rov1200]

Thanks but I wanted the mechanics of how they achieved this. This site says it takes up to 2000 people with vans and also uses the ordnance survey.

http://www.fleetnews.co.uk/news/story/Tele-Atl as-is-behind-sat-nav-mapping/47375

[ACtheTROLL]

believe it or not - they start with an a-z .... or at least the national Os.
these are scanned at ultra high resolution overlayed with long and lat info and the rest is automatic.
each mfr then writes the software that recognises roads - weights them and calculates the routs - just how they do that - just say you are about as likely to get the recipe for coke

there are a number of sites you can get maps and overlay info editors - for DIY editing
http://www.poieditor.com/
all the vans are for is to prove one way systems and tracks

[rov1200]

I was sent up a track last week. It started off as a minor road then gravel/tarmacadam mix then loose gravel and finally pot holed mud. Because of the narrowness of the track it was impossible to turn round. It went on for about 2 miles before reaching a decent road.

I could have reversed after the first 1/2 mile but hoped that it come to an end. All the while it was telling me to carry on.

Obviously the mapper had not bothered to try it.

[ACtheTROLL]

In lothian I ended up down a track which parallelled the main road - my bottle went when the lane became so narrow I couldn't get out I did reverse back (couldn't go forwards.

Closer to home - the preferred route to a village near here is through a dry stone wall - no road .... never has been

with tom tom you can mark and report - I suppose eventualy ......

but when you think of the thousands of miles of roads - it's still pretty impressive
There are some 225000 miles (362000 km) of roads in Britain
I'd like to know how I manage to find all the duff ones though

http://www.woodlands-junior.kent.sch.uk/custom s/questions/driving.html