I only just noticed that these didn’t go to the mailing list. I was wondering why everyone behaved like these posts hadn’t be made…
From: Nemanja Bračko <[email protected]> Sent: Saturday, 5 May 2018 17:37 To: [email protected] Subject: Re: [talk-au] Open Mapping team at Microsoft Australian edits Thanks for the feedback! I'll inform rest of the team about that! On Sat, 5 May 2018, 09:24 , <[email protected] <mailto:[email protected]> > wrote: The central point is not the (minor) misalignment of the imagery, but the fact that you then didn’t take the placement attribute of the way into account when fixing the geometry. You can use the “lane and road attributes” map style in JOSM to visualize this. It is described in detail here: https://wiki.openstreetmap.org/wiki/Proposed_features/placement And here is a real world example from that particular changeset (I fixed it again already): https://www.dropbox.com/s/ulmnym4jcwh3fue/placement_fixed.jpg?dl=0 You can see how the way stays in the middle of the 3 permanent lanes, even when the 4th lane is added. This is indicated by the placement=middle_of:3 tag on the 4 lane section. (middle_of:3 indicates that the way is in the middle of the 3rd lane from left, where the definition of left depends on the direction of the way). The “fixed geometry” version you uploaded was instead like this: https://www.dropbox.com/s/lt4g36o6ewib4kf/placement_wrong.png?dl=0 Having the way move to the middle of the 4 lanes every time a temporary 4th lane was added (entry or exit lanes) instead of keeping the way in the middle of the 3 permanent lanes as the placement tag indicated. Don’t get me wrong, that motorway was in need of having it’s geometry adjusted in many places. Thanks for that. But this particular section of it was already mapped correct down to the individual lanes just a couple of days earlier, and then someone came along and messed it all up again. Cheers, Thorsten From: Nemanja Bračko <[email protected] <mailto:[email protected]> > Sent: Saturday, 5 May 2018 16:53 To: [email protected] <mailto:[email protected]> Subject: Re: [talk-au] Open Mapping team at Microsoft Australian edits Hi! My name is Nemanja and I would like to try to answer this. Our goal is to fix as many as possible geometries and two of the routes that had high priority geometry issues are roads that connects Brisbane and Townsville. DareDJ is not the only one who is involved in this task. All of us are taking in account GPS traces as well (when there are many of them), and trying to align with geometry. In that point we get exact position and high quality of geometry. If that's not a case, then there is no enough GPS traces (we can not guarantee that just one or very few GPS traces are correct) we are mapping per imagery, and one day, when we get enough GPS traces, we can apply just offset without any remapping and spending hours and hours on mapping. I just want to clarify why one or very few GPS traces can not be considered as ground truth. It is because we do not know which GPS is used and what is the precision and how much satellites was in that moment. Some of these GPS traces are very old or taken with old devices, e.g. Nokia N95 which has tolerance of +-30 meters. That can be 60 meters of offset! I hope I had explained it well. Please excuse if there are typos, I'm typing on my phone. PS. DareDJ (as most of us) was offline and will be until Monday, so that's the reason why he didn't answer on your message. Best Regards, Nemanja On Sat, 5 May 2018, 05:10 , <[email protected] <mailto:[email protected]> > wrote: https://www.openstreetmap.org/changeset/58382600 This user, which on his user page says "I am proud to be in Microsoft Open Maps team." Has been making a lot of "Fixed geometry" changesets. Now, the motorway he worked on did indeed in part need fixing, as it was in places 10-30m out of position. But the particular stretch in that changeset I just fixed up myself a few days earlier, using imagery with corrected offsets, and taking into account tagged lane information (because of the placement tag, the "way" that defines the motorway is not always in the absolute centre of all lanes). I made a changeset comment to which I didn't get a reply, so I send a direct message to the user on 29th April to which I also didn't get a replay. Cheers, Thorsten > -----Original Message----- > From: Ewen Hill <[email protected] <mailto:[email protected]> > > Sent: Saturday, 5 May 2018 12:07 > To: [email protected] <mailto:[email protected]> > Subject: Re: [talk-au] Open Mapping team at Microsoft Australian > edits > > Thanks for the heads up. > I have found a large number of canals/ditches added as minor > roads or tracks in NW Victoria as well as fences as tracks etc. I > have sent a message however has anyone else noticed other issues in > the following areas? > > <http://gis.19327.n8.nabble.com/file/t343391/ms.png> > > > > -- > Sent from: http://gis.19327.n8.nabble.com/Australia-f5416966.html > > _______________________________________________ > Talk-au mailing list > [email protected] <mailto:[email protected]> > https://lists.openstreetmap.org/listinfo/talk-au _______________________________________________ Talk-au mailing list [email protected] <mailto:[email protected]> https://lists.openstreetmap.org/listinfo/talk-au -- Sent from my phone -- Sent from my phone
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