| Dan Anderson 2007-08-24, 10:33 am |
| Bruce. wrote:
> They used Tele Atlas back then. I've compared my several years old MG 4.1
> maps with CN NA 2008 and I find many cases were the old MG 4.1 is more
> accurate even today. I'm not impressed with Navteq.
In my area Metroguide ver. 4 is too old and roads are placed more
inaccurately than the Navteq data. Union Blvd., a major (4 to 6 lanes)
north/south route is missing in the middle of town. So routing through
that area is wrong.
Many of the roads match those on USGS 1:100,000 scale topographic
maps. In this area, those roads don't always exist now (meaning
Metroguide ver 4. shows roads that don't exist now) and others
have been moved/rerouted. However, some remote mountain roads
that Navtaq hasn't mapped are on USGS maps and hence on
Metroguide ver. 4. Some people, including me, like MG4 because
it shows these back roads.
With Navteq data I'm confident that the road shown is actually
there. With Metroguide ver. 4, the road may not be there anymore
or may not be as shown.
Navteq has over 600 people out driving the roads gathering
data about road types, speed limits, turn possibilities,
(Navteq says they have 204 attributes) area businesses, etc.
in many countries of the world. It's an impossible task and
they'll receive lots of criticism because they'll tell you
to turn left from road a to road b between 4 pm and 6 pm
when a left turn is not allowed during that time at
that junction. Handling trillions of pieces of data that
also change with time, is very difficult.
--
Dan
(email change 2001 to 2004)
(www.gpsmap.net)
|