Color codes on recorded roads

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Re: Color codes on recorded roads

Postby Shorty-CM » Tue Dec 29, 2009 8:26 pm

Well, there are different messages that state why the server is showing you that segment in yellow. If there is already an existing road, it is usually yellow because your path didn't match up well enough with the existing road. This can be due to poor reception. This can also be due to poor placement of the road in the map. The message that the server attachs to the segment will usually help you deduce what the case is. When you're talking about a new road, like you say, there is nothing to match up, so it's more than likely poor reception for a few moments.
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Re: Color codes on recorded roads

Postby persunde » Tue Dec 29, 2009 5:02 pm

So to sum it all up - those yellow routes are caused mainly by poor GPS reception, in your opinion?

Wouldn't it make a lot of sense to have a simple map legend to tell us this?
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Re: Color codes on recorded roads

Postby Shorty-CM » Tue Dec 29, 2009 2:12 pm

Well, I think I've got over 7,000 km on my iPhone now. (My Dashboard says 3485.0 existing miles and 968.1 new miles, but that's off by a fair bit because there are significant chunks missing from system hiccups here and there over time. I lost a 300 km trip the other day, with a large majority of it being new roads, for example.) I think I know its GPS behaviour pretty well by now, hehe. I've noticed quite a few quirks, including how little you can actually trust that orange/green indicator concerning how good your signal actually is. It doesn't turn orange very quickly. For example, it tends to drift off-line by a noticable amount around curves/turns when the signal isn't very good, even though it's displaying that the signal is fine and dandy. Recording a new road that's straight and is 90 degrees off an existing road in that signal situation results in the intersection ending up being further along the existing road than it actually was, and the new road isn't straight near the intersection because of it. You can see it bending back towards the true straight line of the new road as you get further away from the new intersection. If you're at highway speeds going around a curve when it happens you'll end up with a much gentler curve being recorded, until it all of a sudden snaps back into line when the signal improves a few seconds later. It's times like these that it is nice that we have a display of more/newer GPS tracks that we can reference to adjust the drifting roads later on, heh.
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Re: Color codes on recorded roads

Postby persunde » Tue Dec 29, 2009 1:50 pm

That is true.

I'm not sure if bad reception is the problem though. Because my routes seem to draw up nicely on my iPhone screen, but some of them have different geometry (the yellow ones) when they appear on the web.

And I haven't noticed the GPS signal indicator showing anything but green in those areas.
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Re: Color codes on recorded roads

Postby Shorty-CM » Tue Dec 29, 2009 9:44 am

These kind of errors will never go away. There's nothing the Waze guys can do about how good or bad your phone is receiving GPS signals at any given moment.
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Re: Color codes on recorded roads

Postby persunde » Tue Dec 29, 2009 9:42 am

Okay, thanks.
I'll wait for an update from the waze team on those server bugs before editing my routes then.
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Re: Color codes on recorded roads

Postby Shorty-CM » Tue Dec 29, 2009 9:05 am

I forget where it's listed. But anyway, there's nothing you can do except make sure your phone's in a position where it will get the best reception.
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Re: Color codes on recorded roads

Postby persunde » Tue Dec 29, 2009 8:59 am

I know perfectly well how the GPS system works. I think it comes down to me not fully understanding the meaning of the english word "coverage".

Anyway. Is there any information available on the FILTER_STRAIGHT and other tags?
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Re: Color codes on recorded roads

Postby Shorty-CM » Tue Dec 29, 2009 2:05 am

Pick any place on earth. Stand there with a GPS receiver. The signal quality and number of satellites that you're receiving a signal from will constantly change. There are six different orbits in the system, and each of those orbits has four satellites in it, and they each complete an orbit in 12 hours. The number of satellites that you can see and their position relative to you is constantly changing. As is shown here, there is no such thing as poor GPS coverage.

Poor reception due to the environment around you is not the same thing as poor coverage. If you're driving down a street that has a lot of trees with a lot of foliage above you that create havoc with your reception, that is completely different than saying you have poor coverage.

Now, as for you "doing it wrong", well... The only thing you could do wrong is place your device in such a position in your vehicle that it directly hinders its reception. If you have your phone well forward on your dash/windshield so that it has a clear view of the sky, and nothing is above it but the windshield and the sky, then you are not doing it wrong. If you have it sitting on the console between the front seats, and the only thing above it is the roof of the vehicle, meaning that it's lucky if any GPS signals reach it at all, *then* you are doing it wrong. ;) If anything goes wrong when it's got a clear and unobstructed view of the sky then it is either momentary GPS reception problems, momentary server connection problems (which has a remedy in the works), or some other server-side problem. As long as you give your phone a clear view of the sky, it's kind of hard for you to do anything wrong. Like I say, there's never less than six satellites in your line of sight no matter where you are on earth. And most of the time there's more than that. And you only need three to give you your location. As long as you give your phone a good viewing angle on as much sky as possible, which you do by getting it as far forward of your roofline as possible and under more windshield than anything else, it'll usually do a good job.
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Re: Color codes on recorded roads

Postby persunde » Tue Dec 29, 2009 1:48 am

The way I see it - GPS coverage is poor by defenition in any area where you can't receive a good signal from the satelites, for whatever reason. But let's not get carried away with that discussion ;)

Many of my yellow routes are labeled type:FILTER_STRAIGHT
These two are also redundant: UPDATE_TOO_SHORT and LAST_IN_TRACK

Would you blame those on the server bugs, or am I doing it wrong?
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