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An introduction to how TomTom make maps
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MikeB
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Joined: 20/08/2002 11:51:57
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PostPosted: Tue Nov 20, 2012 5:23 pm    Post subject: How TomTom make maps - Part 5: Map Changes Reply with quote

pocketgpsworld.com

In the previous articles in this series we have seen how TomTom source their data, how the community provides input to improve the maps, how probes have been used to analyse the data, and how traffic information is collected. This final part of the series looks at how all these pieces are put together to manage changes in the mapping data.

As we have mentioned in previous articles there are many data items captured and entered into the main TomTom database. Of course collecting the data is just a small part of the process. With hundreds of billions of bits of data it is impossible to process each and every one as an individual item. This is where the back end systems come into play.

Click here to read more...
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navtrav
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Joined: 03/01/2003 19:00:24
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Location: United Kingdom

PostPosted: Fri Nov 23, 2012 7:00 pm    Post subject: Reply with quote

DennisN wrote:

The reason for all these funny instructions is TomTom have reduced the details on some "roads", presumably for space constraints on mapping.


Thank you Dennis for that explanation and really good explanatory screen shots.

Such a shame that actual mapping suffers so other unwanted data has to be included. It is, after all, meant to be a NAVIGATION device, not music player or a Facebook app or whatever.

I would prefer just to download a much fuller detailed map of a single country (like in the old days) than all Europe with incomplete road details that can land us going down farm tracks. And tells us to go straight on past a lay-by!

Likewise, in the past, POIs could include much more information (they had many more data fields) than we have now.

From this excellent series of articles I've seen that there is an ever-expanding mountain of information that has to be processed and fed to us hungry travelers, but either technology grows to handle that or, as I said, lets have smaller maps.
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Tim
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Samsung Galaxy S4, Galaxy Tablet S, TomTom. Osmand+ and Sygic. Ex-TomTom Go 1000 Live, ex-TomTom Go 700, ex-TomTom truck, ex Navman/Ipaq
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LoekV
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PostPosted: Sun Nov 25, 2012 2:04 pm    Post subject: Reply with quote

Thanks Mike! Again an interesting story :-).
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navtrav
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PostPosted: Sun Dec 02, 2012 6:55 pm    Post subject: Reply with quote

M8TJT wrote:
Why has this informative topic turned into a Teleatlas/TomTom slagging off. At least Navteq have got away with it this time. We all know the 'problems' with the maps without going over the same old ground time and time again.


I don't and am very interested to know which of the big suppliers has the most accurate maps with the most data. Does anyone know of an up-to-date review comparing them?

I've found this series of articles fascinating, especially about how 'live traffic' works. Again, is there anywhere one can compare how the different makes fare in this specific area.

For example, TomTom's efforts can be admired on their Live Traffic website. But to me there is one big failure.

It shows traffic movement (or non-movement!) admirably and its Live GPS receivers seem to do a good job re-routing you away from jams.

BUT, it doesn't show blocked roads. For example, near me a road has been shut off because of flooding for a week now. In normal times, it's a rural rat-run over the Thames and at certain hours often has queues of slow traffic clearly showing up on the Live Traffic website. Now at all hours it shows the road clear - that's because no one can drive past the 'road closed' signs!

BUT still in this past week, the GPS wants me to take that route. Only because I know it's blocked I can tell TomTom to avoid that road. With Sygic (for Android) which uses TomTom maps and data, there isn't that option.

Anyway, anyone from outside the area wouldn't know and could be involved in up to an hour's detour (that's if they didn't get lost!)
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Tim
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Samsung Galaxy S4, Galaxy Tablet S, TomTom. Osmand+ and Sygic. Ex-TomTom Go 1000 Live, ex-TomTom Go 700, ex-TomTom truck, ex Navman/Ipaq
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Andy_P
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Joined: Jun 04, 2005
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Location: West and Southwest London

PostPosted: Sun Dec 02, 2012 8:53 pm    Post subject: Reply with quote

navtrav wrote:


It shows traffic movement (or non-movement!) admirably and its Live GPS receivers seem to do a good job re-routing you away from jams.

BUT, it doesn't show blocked roads.....


It certainly does... or it certainly SHOULD do.

I often see blocked roads marked by the LIVE HD Traffic system on my TomToms.

But I've also seen at least one example of a long-term blockage that wasn't shown (The Albert Bridge over the Thames in London, which was closed for months) I complained to TomTom about it (as I'm sure loads of other people must have done), but it took them ages before they showed it as blocked.
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