OpenStreetMap

Vincent de Phily has commented on the following diary entries

Post When Comment
That blade of grass is coming back to haunt us. about 1 month ago

One of the main goal of most renderings is to look lovely, so it'd be reason enough. Plus it's actually useful to know what kind of sport is played on a particular field.

Concerning the OP, see this help.o.o question for a previous discussion about it. I'm still of the opinion that we shouldn't map pitch lines, but this is apparently not unanimous.

One thing that commenters agreed on is that barrier=line is the wrong way to go. You should tell the contributor to find a better scheme. Maybe also him the french and german rendering styles, as well as this issue for the default osm.org style, it might satisfy his wish without bloating the db.

OSM x GM's "glitch" 2 months ago

The Rio de Janeiro favelas should be good candidates for a resident-led slum mapping, like happened in Kibera. I wonder if there are big OSM contributors living in Rio who could mentor this.

Possibly importing USGS forest data 4 months ago

The most common way to convert pixel values to a shape (the term 'contour lines' is usually associated with relief) is to use a "lakewalker" algorithm (surely not the proper COMP-SCI term, I'm just using the name of a JOSM plugin here). You can use other tools, but that one should work relatively well.

Go ahead and try it actually: install the scanaerial JOSM plugin and use it on one of the dataset's imagery. You'll get a feel of how well it works. Don't upload your work unless you have checked that the license is OK. Now think about doing this automatically at a larger scale, and about conflating this new natural=wood with any existing osm data.

My guess is that doing this automatically (as an import) will look much less appealing to you after this experiment. But using the dataset as a source to manually run scanaerial on might still be a time-saver. Sometimes, you're better off doing it manually than algorithmicaly. Your call.

Concerning the Bing vs Landsat argument, consider the fact that Mapbox updates its landsat source (wherever no highres imagery is available) automatically, and is going to be much better than a 2010 non-averaged snapshot used by that dataset.

Possibly importing USGS forest data 4 months ago

In my experience, import of landcover data is near-impossible to get right.

For example the Corine data was imported in France, and the amount of post-import work to disentangle the result and conflate with pre-existing data is still ongoing. It would probably have been faster to do everything ourselves via satellite imagery. In Ireland we did all the pre-import work, evaluated it, and concluded that it would do more harm than good.

This dataset doesn't look much more appealing: it's guaranteed to have both false-positive and false-negatives, it is based on images much older than what's currently available, you'll have to use a lakewalking algorithm to vectorize it (which pretty much always require manual touches afterwards), and only then can you start dealing with the conflation problem (which is a biggie).

IMHO It's a great dataset to use at low zooms, but not for the OSM usecase. Time would be better spent tracing by hand.

The difference between a roundabout and "just a road that goes in a circle" 5 months ago

I have seen a lot of roundabouts constructed "preemptively" when there isn't yet a 3rd road connected to it. The plan is probably always to have more roads connected to it, but that might be many years away if it happens at all.

Request for open street map of karu nasarawa nigeria 5 months ago

It's not clear what you're asking for.

Protecting the map against Pokemon Go mappers 5 months ago

Neither option solves the fundamental problem (improving our anti-vandalism processes and tools). They only ease the pain somewhat for this particular instance of the problem.

But both options fix the wrongness that a hugely successful commercial game is indirectly harming a Free data/software community without any attempt to soften the issue, and maybe even profiting from it without respecting its license.

Note that I've been playing PoGo since August, and mapping on OSM since 2010.

Protecting the map against Pokemon Go mappers 5 months ago

Sigh... If abuse from PoGo player is continuing to waste OSM contributor time like this, we should really push for some official response from Niantic to the OSM Foundation.

Either PoGo doesn't use OSM at all (in that case Niantic should say so clearly) or it does (in that case Niantic must respect the license by crediting OSM, and should acknowledge the maintenance burden they are causing and help somehow).

In the first case, the abuse will hopefully slow down, and in the second case OSM will get some PR, the respect of not violating its license, and hopefully some resources to deal with the abuse.

Finding dragged nodes 6 months ago

Osmose and OSMI both also catch self-intersecting ways and multipolys. Don't think it would catch that particular problem, but they catch many others. Those QA tools will keep you busy. http://wiki.openstreetmap.org/wiki/Quality_assurance

Rail Crossing Warnings Are Sought for Mapping Apps 8 months ago

While OSM has that data (quite complete in my experience), getting OSM-based routing apps to issue a warning is going to take a fair bit of outreach effort (given how many apps would need to add the feature).

Why OpenStreetMap US elections should use Single Transferable Vote (STV) 8 months ago

Insert jokes about americans clinging to demonstrably-flawed election systems here (sorry for the smugness, Eurrope isn't free from election problems either but the USA's is quite high-profile).

For what it's worth (I'm not going to be an OSM-US member anytime soon), switching to STV would IMHO be a great thing to do.

Un outil de comparaison de carte 8 months ago

http://mc.bbbike.org/mc/ est une autre installation du même outil, avec notament le fond de carte osmfr.

3 years of welcome messages, more than 3400 of them 8 months ago

Or even compare against all the users (in other locations probably) which you didn't welcome to see if, for example, the retention ratio is better ?

Question regarding deletion of some tracks/paths.. 10 months ago

https://tyrasd.github.io/osm-qa-feeds/ is a handy tool to grab more monitoring links. It'd be great to keep it updated with other tools.

Most OSM contributors have areas they specially care about, but don't get too hung up about people editing "your" data specifically. The OSM data is constantly in flux, with some occasional setbacks in quality but generally moving in the right direction. It's better to worry/care about a specific region/topic than about the particular set of objects you edited.

suppression compte 10 months ago

Pour supprimer un compte Il faut envoyer un mail à support@openstreetmap.org

https://wiki.openstreetmap.org/wiki/OpenStreetMap_account#Deletion

Cela dit, supprimer un compte qui n'a eu aucune activité ne sert pas à grand-chose. Vous trouverez peut-être plus interessant d'aller sur http://www.openstreetmap.org/user/chap's/account pour changer l'email et/ou le nom affiché pour votre compte.

On Being Trumped 10 months ago

Pretty much all OSM surveyer have to deal with that. I find that giving lots of info when locals get curious/suspicious works best.

Be cheerful and use it as an opportunity to evangelize about OSM. Print some small flyers to hand out. Show osm on your smartphone. Show the photos you've taken. Be ready to answer the usual "it's a private road" (It's actually public, no trespassing needed), "what company do you works for" (it's a worldwide community of volunteers), "we've had burglaries here recently" (I can understand why you were worried when you initally saw me). Compare with Google Map/StreetView (more pervasive privacy issues, harder to fix, lower quality data...). Etc

recherche 11 months ago

Un peu vague comme question. Quel critère définis la personne recherchée ?

UK Unadopted Roads - What are the Accepted Mapping Keys? 11 months ago

Getting back on the subject of using the right OSM medium for the right purpose, may I suggest http://help.osm.org/ for questions like this ? It's made for that, it uses your osm.org login, you'll get (in my experience) better feedback than on a diary post, and the questions and answers feed a searchable knowledge base.

UK Unadopted Roads - What are the Accepted Mapping Keys? 11 months ago

Regarding the original question, it seems that "unadopted" is purely an ownership/maintainership distinction, and is orthogonal to all the other tags we frequently use (highway=residential/service/track, access=private, surface=*, etc).

So I'd say tag all those first, since they cover all the attributes that OSMers usually care about. Then go ahead and add unadopted=yes, if you know this fact for sure. Just don't make it imply any physical attribute of the road.

There are currently 89 unadopted=yes in the db. It'd be great if you had the time to write a wiki page explaining what it is, as it's unlikely to be understood outside of the UK.

UK Unadopted Roads - What are the Accepted Mapping Keys? 11 months ago

What's an "unadopted road" ?

Also, remember that noexit=yes is only useful as an aid to mappers in unclear cases, and doesn't actually need to be added to cul de sacs. A bit like oneway=no. Noname=yes is different, because that information can't be infered from the rest of the data.