OpenStreetMap

SomeoneElse has commented on the following diary entries

Post When Comment
Egleton Triangulation Pillar 8 days ago

The wiki pages often suggest other tags that I don't know about (I had no idea that "type=triangulation" was used, for example). Looking at the area in an OSM editor, I can see that the "NLS - OS 1:25k 1st Series 1937-61" map that's available as background does show it as being just above a 475' (145m) contour, so somewhere in that region would do I guess. Depending on the editor you're using you may need to zoom out to zoom level 16 to see this background.

Re mapping parties, the talk-gb mailing list is the place that most things will be mentioned. There may also be discussion in the talk-gb channel on IRC. There are regular active meetups (usually in pubs) in at least London, Birmingham, Notingham/Derby and Edinburgh. I think someone has recently been trying to organise something in Oxford too. Mapping meetups are rarer - I'd guess April/May for the next Midlands one.

Egleton Triangulation Pillar 8 days ago

Re the elevation, I probably wouldn't use the elevation from an eTrex 10 as I don't think that's got an altimeter in it and is just reporting the GPS altitude. It might be close to the real value, or it might not. Personally I'd also be careful with an altimeter-equipped value, based on changing weather conditions and how recently calibrated.

However, any trig point that's been there for 50 years or so is probably going to be on an out of copyright map somewhere - presumably you could use the elevation from that?

Re "Bing's idea of the absolute position of points on the earth's surface" - that's an excellent question. Imagery such as Bing's can be offset (though it's less of a problem than it once was) so it makes sense to check available compatible sources such as GPS traces as well. In the absense of any other information where you've put it is as good a place as any. The general way things work in OSM is that things get added and then refined later - don't get worried about "I might not have put it in exactly the right place" - someone can always move it later.

For info - if you've got any general questions you can always ask over at the help site: https://help.openstreetmap.org/questions/ .

Finally, welcome! You actually missed a mapping party at Scalford just up the road from you at the weekend :)

2016 Washington New Users Report 15 days ago

That's great - it's brilliant that you're seeing a difference in the "time to stick around mapping" over a significant number of users.

3 years of welcome messages, more than 3400 of them about 1 month ago

A while ago I did have a look at the retention rate in the Polish community, where 75% were welcomed and 25% not (see https://lists.openstreetmap.org/pipermail/welcomewg/2013-March/000022.html and the links back from there). There wasn't an appreciable difference when I looked between 2 and 3 months after the message was sent (or not).

What I didn't look at that would have been interesting was contribution quality, and I've not gone back to look at longer term retention (anyone can do this - just look at new Polish mappers from that period whose UID was divisble by 4 or not).

Old-style multipolygon cleanup in Luxembourg about 2 months ago

When are you going to do the pull request to P2 then (which IIRC still creates them)?

:)

Clean up the "fixme's" around you! about 2 months ago

... and for the ones that need a physical survey, https://github.com/SomeoneElseOSM/Notes01 (shameless plug) will let you create a GPX file for a Garmin handheld for local surveying or both notes and fixmes.

mileage convertion when reading 2 points 2 months ago

Assuming you're talking about directions, use the website that's providing the directions (whichever one you're using), not the simplified interface from osm.org.

... or divide by 8 and multiply by 5 :)

Time to cleanup the wikipedia:xx tags? 2 months ago

For example, on the ground, you can't distinguish between administrative entity and settlement.

I think you can. To take an example that I used in this "talk" list post earlier today:

https://lists.openstreetmap.org/pipermail/talk/2016-November/077139.html

"Rossnowlagh" is a settlement. It's got a hotel and a cafe, and lots of other settlementy stuff. "Rossnowlagh Upper" and "Rossnowlagh Lower" don't have any of these - in fact when I was there there was nothing to indicate they exist at all on the ground.

Time to cleanup the wikipedia:xx tags? 2 months ago

Alas, the real world has inconsistency in it, and we have to deal with that. Wikipedia isn't "a database" it is "lots of different databases, with some coherence between them" OSM's wiki is notoriously a haven for people who want to tell the real world how to behave rather than describe it, so sometimes you have to take what's written there with a pinch of salt.

Sure, there will be examples where people have added multiple wikipedia keys by accident, but some may be deliberate, and the way to find out is to ask.

Blindly converting wikipedia entries to wikidata entries would have the same problem as adding wikidata without putting much thought into it (see https://www.openstreetmap.org/changeset/43749373 for a discussion of some of the issues that can occur there - a wikipedian with the best of intentions but no local knowedge missed things that would be obvious to a local).

Unfortunately, there have been so many "mechanical turk" additions of wikidata links to OSM recently by people unfamiliar with the things that they are linking that it's effectively devalued the ones that existed previously. That's sad (and is obviously a completely different issue to what you're talking about here), but it does mean that "wikidata is not the (only) anwer".

Time to cleanup the wikipedia:xx tags? 2 months ago

I'd ask the question "what problem are you trying to solve?". If it's not broken, don't try to fix it.

More importantly each wikipedia community is pretty distinct - I can imagine why a community might want to first link to a particular wikipedia language. Here, for example are the wikipedia pages for the country of Serbia in Serbian and Albanian

https://sr.wikipedia.org/wiki/%D0%A1%D1%80%D0%B1%D0%B8%D1%98%D0%B0

https://sh.wikipedia.org/wiki/Srbija

as you can see, the maps are different - one contains Kosovo, one does not. You can't assume that all wikipedias agree with each other, and if a wikidata entry was created from just one wikipedia entry, then it'll naturally reflect the biases of that wikipedia entry.

In Kosovo's case the wikidata entry https://www.wikidata.org/wiki/Q1246 says "not fully-recognised state in Southeast Europe" (which is correct) and "said to be the same as" "Autonomous Province of Kosovo and Metohija (https://www.wikidata.org/wiki/Q1255)", which is more problematic, because it doesn't say "said to be the same as by whom".

: ) 2 months ago

It's also worth mentioning that I'm also seeing wikidata edits locally (to be clear, not from either of the users mentioned above) that seem to be linking "not quite the same thing" in OSM and wikidata, so care is still needed. As I said on the forum link posted above it's "something that as a community we'd need to discuss", and that doesn't appear to be happenong, smiley face or no smiley face.

బాలల మ్యాపింగ్ వర్క్ షాప్, Children's workshop ##OSMGeoweek 2 months ago

Those images are 5Mb each. I'd suggest using much, much smaller ones to avoid using up everyone's mobile bandwidth!

Please remove this Spammer 3 months ago

I have not mis-read your post. I am simply suggesting that if you want spam to be removed that you report it somewhere that the admins (who have the ability to delete spam users) will actually see it. Writing a diary entry about it is likely only slightly more effective than pinning a note to a tree in Hyde Park :)

Please remove this Spammer 3 months ago

Rather than writing a diary entry suggesting that someone reports the spam that you find, why not report it yourself?

Cleaning up the streets. 3 months ago

I suspect a number of these problematical names may have been left by MAPS.ME users who don't actually realise that they're updating OSM (the app doesn't make it clear at all). You can monitor and reverts to that via http://mmwatch.osmz.ru/ (helpfully written by one of the authors of MAPS.ME).

More Mysterious Markers 3 months ago

My money's on "stop valve"...

Rules for Robot/A.I. Mappers 4 months ago

I suspect we're some way away from worrying about "maximize efficiencies without destroying the dignity of people". :)

The only "robot mapping" I've seen in OSM so far could easily have been labelled "rubbish mapping" - it seems to involve "try and do some basic edge detection and assume that whatever has been found is a road".

A better approach would simply to ask all mappers - robot, human, feline, canine, whatever - to simply "be honest" - if you're a robot, say so, and say who your "handler" is (just like with import accounts). If you're mapping on behalf of a corporation or an organisation, say that too.

Weekly roundup - common errors and unexplained edits observed 4 months ago

Re the deleted mosque - there was an accidental node drag adjacent to it. Fixed in http://www.openstreetmap.org/changeset/42544694 and the next changeset. I've not mentioned it to the mapper; manoharuss is already in conversation and they're only 9 edits in.

When new values start appearing in OSM… 4 months ago

"zebra" is a type of crossing, it's not in any sense a "reference".

Mapper of the Month: SomeoneElse (United Kingdom) 5 months ago

The list link should be http://resultmaps.neis-one.org/osm-discussions .