OpenStreetMap

Richard has commented on the following diary entries

Post When Comment
Losing faith in OpenStreetMap 8 days ago

Genuinely sorry to see you go.

For those not aware of the background, some of the discussion at https://help.openstreetmap.org/questions/41053/prow-tagging-england-wales may be relevant.

Don't know what to think of it of this research 18 days ago

Assuming the "research" quoted is academic, I wonder what the ethics committee of their university might make of this...

"Duck Lanes" on OSM? about 1 month ago

It's a rather lovely stunt though. When I worked at BW (CRT's predecessor) the press office were always on the hunt for quirky stories that would get them in the papers. I'm delighted that they've finally found the answer and that the answer is "ducks".

Birchville Picnic Area, Upper Hutt, New Zealand about 1 month ago

Welcome - good to see some mapping activity there (I was visiting relatives up the Akatarawa Road just a month ago!).

map styles: Default OSM vs Humanitarian about 2 months ago

paulbiv - you took the words out of my mouth. Spot on.

The Google Maps style is increasingly designed as a backdrop for location-based search results and for (car) direction polylines - hence the incredibly minimal style. That's fine for them, but it's not something we should seek to emulate.

(Still, I'm really pleased to see Mateusz tackling the wider issue.)

Details about iD editor users get publicly, permanently and silently logged with every edit – a privacy breach 2 months ago

I think you're extending own values to other people here.

By definition, people who believe that any piece of identifying information is a "privacy breach" are more likely to use JOSM. That's fine. That's their choice.

For a different userbase this is really helpful information. The language means other users are more likely to be able to assist them via changeset comments, for example.

Please don't assume that everyone shares your beliefs, especially given that you come from a country and culture known to be much more sensitive to these things than the average. For example, my home address is readily viewable by a whois lookup, and a picture of my front window has just been retweeted 40 times. ;)

US County Roads (from residential to track) 3 months ago

@Aury88: I'm a European mapper, I'm just helping out in the US! But as maxerickson says, they're not agricultural access roads - they're just rural roads. You or I have every right to drive or cycle along them, and indeed I might consider them a pleasant cycling alternative to the busy main roads.

US County Roads (from residential to track) 3 months ago

Great to see someone else joining in the Herculean task of rural TIGER fixup.

I tend to take the attitude that guessing surfaces remotely is difficult, and that it's more important to get broad-brush coverage sooner (so that we might one day have a usable map) rather than very detailed coverage of particular areas. So I usually choose one of:

  • highway=track - unpaved and ungraded
  • highway=unclassified, surface=unpaved - unpaved but graded
  • highway=unclassified, surface=gravel - if the surface is apparent from the imagery
  • highway=unclassified - paved
  • highway=tertiary - good quality paved with centreline

highway=track implies unpaved so I don't usually add surface/tracktype tags when working from imagery.

How to find and analyse traffic ? 3 months ago

It's certainly not something that's stored in OpenStreetMap. Some countries release traffic data openly but not many that I've found.

Fixing the rural US 4 months ago

Yes, =residential is still a good value for that sort of road. I think the key there is to take the tiger:reviewed tag off (so it's clear it's not raw TIGER) and to make sure there's a surface tag if the road is unpaved.

It's not because you have accurate data that you have to upload all of them in OSM 4 months ago

Splendid. Ok. Here's your challenge.

Write some polyline simplification code that reduces [1,0],[2,0],[3,0],[4,0],[5,0],[6,0] to [1,0],[6,0], yet is completely lossless.

Any programming language of your choosing. It's very doable.

Second task, since you ask for "challenges" (plural): adapt that simplification algorithm to permit minimal loss of geometry within the bounds of feature width and GPS accuracy. You may choose to implement an adjustable threshold as part of this.

It's not because you have accurate data that you have to upload all of them in OSM 4 months ago

"All simplifying algorithms lose information"

ORLY?

If you have a polyline [1,0],[2,0],[3,0],[4,0],[5,0],[6,0], you can simplify that without any loss of geometry to [1,0],[6,0].

If you have a polyline [1,0],[2,0.0000000001],[3,-0.0000000001],[4,0],[5,0.0000000001],[6,0], you can simplify that (units permitting) with minimal loss of geometry to [1,0],[6,0].

"Minimal" is in the eye of the beholder, but given the width of the features we survey in polyline form in OSM and the positional accuracy of GPS units, it's clearly >0.

Still, as both Vincent and I are only editor coders, what the hell do we know about how these things actually work, eh, Rovastar?

It's not because you have accurate data that you have to upload all of them in OSM 4 months ago

Given JOSM users' proclivity to demand that every single possible error is trapped by iD (cf https://github.com/openstreetmap/iD/issues/1461) and P2, I think we should quit ragging on Ragi, and instead JOSM should refuse to upload unnecessarily detailed ways like this. It's the responsible thing to do. ;)

Third Anniversary of Mapping in the Peak District National Park 4 months ago

That's terrific!

Funny highway shortcuts with the new routing feature 5 months ago

[For the avoidance of doubt, my comment was a reply to the original posting, not to Rovastar's comment which was posted at the same time.]

Funny highway shortcuts with the new routing feature 5 months ago

...is exactly why we've added routing to the front page!

Large amounts of OSM data is unsuitable for routing. Putting routing front-and-centre means this will get fixed. Thanks for fixing this one and I hope you find many more such bugs to fix. :)

Fixing the rural US 5 months ago

@Alex - interesting, and good to see Mapbox tackling this.

Have you thought about running an automated comparison with Arnold (as you blogged at http://openstreetmap.us/2014/12/arnold-for-osm/)? I'd expect that any road showing on Arnold is of reasonable quality; if the corresponding geometry in OSM is tagged with highway=residential, tiger:reviewed=no, that suggests a priority for retagging.

One example I found just by zooming into Eric's Arnold rendering: here in WV there's a highway=residential which has moderate traffic flows and should really be a tertiary.

Fixing the rural US 5 months ago

@jumbanho: Yes, I can see the logic in that. Essentially, as long as unpaved roads are tagged as such, that's great. (What's a little more worrying, and something I've encountered several times, is when people retag these gravel roads as highway=unclassified without adding a surface tag.)

Learn-a-tag: driving_side=left/right 6 months ago

I wonder how you'd tag the short section of the River Cam where boats should follow the left bank, as opposed to the right bank (which is standard everywhere else on the UK waterways). 'driving' doesn't seem the correct word for a boat but maybe I should just let that slide...

Fix a Forest - experimental tiles from US Forest Service data 6 months ago

@mojodna: Just posted it on github - does this help? https://github.com/systemed/forest_roads