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Ilya Zverev

Reverting a change has been as important task in OSM as it is impossible. With geodata, there are just too many edge cases. And OSM, unlike Wikipedia, is not a set of objects which you can process independently, it is one big ball of wibbly-wobbly nodely-wayly stuff.

So I thought it might be fun to write a proper 3-way reverter myself:

github.com/Zverik/simple-rever

It doesn't get too deep in algorithms, hence it can reject a changeset, but if it works, it works 100% without conflicts.

18 April at 11:50 | Open on en.osm.town
73 comments
Ilya Zverev replied to Ilya

And if doing "pip install" is too much work, there is a web version of that, ready for your changeset lists:

revert.osmz.ru/

Of course it's limited, since I don't want to overload mine or API servers.

Kamil Monicz (NorthCrab) recently published his own take on such reverter, but the usage of Google's text processing library leads to weird unreported issues when reverting geometry modifications. So be careful:

wiki.openstreetmap.org/wiki/Os
18 April at 12:03 | Open on en.osm.town
Ilya Zverev replied to Ilya

After OWL (look it up) died, we were left without map monitoring tools. So I wrote a backend in Perl, learnt OpenLayers and made this website.

WhoDidIt tracks node edits and groups them into small rectangles, so you can see where people changed geometries, and could subscribe to an area.

My instance did non survive the https, but thankfully Simon made a fork. Alas I can't get it to work either:

simon04.dev.openstreetmap.org/

It's definitely old, OSMCha covers all that better. But it was pretty.

After OWL (look it up) died, we were left without map monitoring tools. So I wrote a backend in Perl, learnt OpenLayers and made this website.

WhoDidIt tracks node edits and groups them into small rectangles, so you can see where people changed geometries, and could subscribe to an area.

My instance did non survive the https, but thankfully Simon made a fork. Alas I can't get it to work either:
20 April at 19:06 | Open on en.osm.town
Ilya Zverev replied to Ilya

For a possible new version that also accounted for ways and relations, I first looked at augmented diffs. But every time I try to use them, I regret it.

So I started writing "changechange": a script that keeps track of references and enriches official osmChange files with geometries and references.

github.com/Zverik/changechange

It would not lead to 100 MB minutely diffs, like in Overpass, but enough to keep track of changes and maintain filtered extracts.

Didn't have resources to finish though.

For a possible new version that also accounted for ways and relations, I first looked at augmented diffs. But every time I try to use them, I regret it.

So I started writing "changechange": a script that keeps track of references and enriches official osmChange files with geometries and references.

github.com/Zverik/changechange

20 April at 19:16 | Open on en.osm.town
Ilya Zverev replied to Ilya

Regarding mapping statistics, we are still down to counting nodes and ways. For a mapping party in 2021 I spent three weeks experimenting with something better.

OSM Changes Counter is not well documented, but can count changes to objects of a given type, split them by city, apply weights (e.g. tagged node is worth more than a road way).

It also correctly counts roads splits and merges to output results in km — I think it's the only tool in all OSM that does that.

github.com/Zverik/osm-changes-

Regarding mapping statistics, we are still down to counting nodes and ways. For a mapping party in 2021 I spent three weeks experimenting with something better.

OSM Changes Counter is not well documented, but can count changes to objects of a given type, split them by city, apply weights (e.g. tagged node is worth more than a road way).

21 April at 18:19 | Open on en.osm.town
Ilya Zverev replied to Ilya

This one is not about OSM, but might be interesting to railway enthusiasts like me :)

GeoAlbum is a photo album with geospatial context. The script was inspired by @tmcw 's Big: keyboard navigation, data in html tags. You make an html page, include the library file, and it turns into an interactive album with numbered photos and additional layers.

github.com/zverik/geoalbum

I used it to share photos from a railway construction site along three years:

textual.ru/lk120430/
22 April at 11:26 | Open on en.osm.town
Ilya Zverev replied to Ilya

In 2020 the @sotm was held online for doomsday reasons. I usually help with fun things at these conferences, so for 2020 I made an @openstreetmap quiz. Having tried it now, I'd say I made it a bit harder than I should have.

zverik.github.io/sotm2020-quiz

Being a fan of data structures, I of course made it a quiz framework, but unlike GeoAlbum, this repo got zero forks. Probably because I didn't share it much.

Today is the last day to submit your talk for @sotm 2024 btw!

2024.stateofthemap.org/calls/g

In 2020 the @sotm was held online for doomsday reasons. I usually help with fun things at these conferences, so for 2020 I made an @openstreetmap quiz. Having tried it now, I'd say I made it a bit harder than I should have.

zverik.github.io/sotm2020-quiz

Being a fan of data structures, I of course made it a quiz framework, but unlike GeoAlbum, this repo got zero forks. Probably because I didn't share it much.

23 April at 9:02 | Open on en.osm.town
Ilya Zverev replied to Ilya

I dabbled in creating map styles like ten years ago, with Mapnik and TileMill. For our local cycling community I made a style that looks excellent printed in black&white, on which we could overlay routes. It was called like the community: "Veloroad".

Trained eye could notice multiple things on it that even modern styles don't do: look at road and river names, station symbols, place visibility.

There is a working tile server, but super slow. Probably gonna take it down.

osmz.ru/veloroad.html#7/58.374

I dabbled in creating map styles like ten years ago, with Mapnik and TileMill. For our local cycling community I made a style that looks excellent printed in black&white, on which we could overlay routes. It was called like the community: "Veloroad".

Trained eye could notice multiple things on it that even modern styles don't do: look at road and river names, station symbols, place visibility.
25 April at 8:58 | Open on en.osm.town
Ilya Zverev replied to Ilya

Obviously running command-line tools to produce a map is not ideal for non-GIS people. So I also made a web UI to prepare route maps.

You just upload a GPX trace, adjust the printing bounds, add a scale bar if needed, and download a PDF. Another online tool would merge several PDFs into a booklet.

It's actually a set of tools underneath, some fix mapnik's SVG issues, some preprocess the values. I know of at least one business spawned from this (not mine obviously).
25 April at 9:14 | Open on en.osm.town
TheStroyer replied to Ilya

@zverik would you have preferred it would be your own company to make a product out of it? Or do you want to have a different company based on OSM?

25 April at 11:25 | Open on mastodon.social
Ilya Zverev replied to TheStroyer

@TheStroyer I don't want to run a company based on a single product, because I don't have an attention span and management skills for that :) I'm pretty fine with my tools used for business, and with this one, I helped set them up actually.

25 April at 12:31 | Open on en.osm.town
TheStroyer replied to Ilya

@zverik ah yes short attention span. That's why you have so many different projects 😂
But seriously, manh of these projects are really great. They just needs l have started just one project in OSM. And it's probably less complex than many of your projects

25 April at 13:00 | Open on mastodon.social
Ilya Zverev replied to Ilya

Ten years ago everybody made maps with Mapnik. There were several scripts that simplified the task, but all had issues. So I wrote another.

Nik4 makes preparing a map image easy. No calculations needed, just choose an area, put physical or pixel dimensions, and you got the exact map you expected.

github.com/Zverik/Nik4

There were many little features inside that removed hassles. Like partial rendering, scale factors, ppi and route fitting. And fixing cairo's SVG output.

26 April at 9:54 | Open on en.osm.town
Ilya Zverev replied to Ilya

Of course another question that was heard from every business, "how do we get the tiles". Mapnik had a sample python script packaged, but it was slow and hard to use. I'm pretty good at APIs, so I made my own.

Polytiles can render regular raster tiles for a given bbox in multiple threads. Obviously. It also can use a polygon file or a relation from OSM, it can render retina tiles, generate an mbtiles file, or just produce multiple lists for other tools.

github.com/Zverik/polytiles

27 April at 18:39 | Open on en.osm.town
Ilya Zverev replied to Ilya

Obviously setting up Mapnik locally is hard, and people wanted to download OSM tiles with a proper UI.

In 2011 I took over the development of JTileDownloader, which does exactly that. Bulk downloading was frowned upon even then. I tried to ease the load: imposed a 5 tiles/sec limit and altered downloading order to meta-tiles (8x8 tile packs).

wiki.openstreetmap.org/wiki/JT

Still, @osm_tech don't care, JTD was banned by user-agent, and people returned to anonymous bulk downloaders with no safeguards.

Obviously setting up Mapnik locally is hard, and people wanted to download OSM tiles with a proper UI.

In 2011 I took over the development of JTileDownloader, which does exactly that. Bulk downloading was frowned upon even then. I tried to ease the load: imposed a 5 tiles/sec limit and altered downloading order to meta-tiles (8x8 tile packs).
28 April at 7:40 | Open on en.osm.town
Ilya Zverev replied to Ilya

And back to my projects from days back, that still operate. In the same trend, seeing something and improving on it, I took Frederik's BigMap and added an online tile-stitching service.

bigmap.osmz.ru/

The UI is the same, still bad, but it's the easiest way to get a raster map for an area. And also georeferencing files for OziExplorer or QGIS. Many people use it daily.

I see how it could be made better, faster and easier, but as always, not enough time. And no alternatives haha.
29 April at 16:48 | Open on en.osm.town
Rihards Olups replied to Ilya

@zverik Have used this one (grabbing the generated Perl script) - thank you for this tool :)

How is georeferencing done?

29 April at 16:50 | Open on mastodon.social
Ilya Zverev replied to Rihards

@richlv Thanks for using it! Georeferencing is simple — it's tiles, we know exact locations of all corners :) Just download a WLD file and put it near the image.

29 April at 16:51 | Open on en.osm.town
Rihards Olups replied to Ilya

@zverik Ah, is this a usecase like "download tile files locally and use them as a georeferenced layer"?

I'm only doing OSM in an amateurish way, thus these GIS things are another world for me =)

29 April at 16:54 | Open on mastodon.social
Ilya Zverev replied to Rihards

@richlv Yes, exactly. A good alternative to adding a live OSM layer and re-downloading tiles every time something moves.

29 April at 16:55 | Open on en.osm.town
Rihards Olups replied to Ilya

@zverik Neat, thank you for the explanation. Maybe one day I'll find time to dig more into these topics :)

29 April at 18:15 | Open on mastodon.social
Ilya Zverev replied to Ilya

When belgian OSM guys made the Welcome Tool in 2016, I set up an instance for Russia and started welcoming people.

I sent a few hundred messages, and after promoting the tool, some other mappers did too.

Alas the response rate was like one percent.

And when I got replies, sometimes I wished I hadn't.

But without welcoming messages, people in OSM feel themselves in a vacuum. There are still no links to communities anywhere on osm.org.

Here's the global WT instance: welcome.osm.be/
30 April at 9:44 | Open on en.osm.town
Eugene Alvin Villar 🇵🇭 replied to Ilya

@zverik maybe you have some suggestions on how to improve openstreetmap.org/communities ? One idea being floated around is to embed the OSM Community Index map somehow in that page. (The list of local chapters is already dynamically based on the index.)

#OpenStreetMap

30 April at 14:54 | Open on en.osm.town
Ilya Zverev replied to Eugene Alvin Villar 🇵🇭

@seav Start with a big bold link to the forum on the "Communities" page!

Generally I'd take the hint from the iD editor. It does a pretty good job of listing links after you upload a changeset.

1 May at 5:36 | Open on en.osm.town
Luis Villa replied to Ilya

@zverik ooof I feel that one. Have started making my first contributions in years (because I realized I can add bike racks) but it might as well be posting into the void.

30 April at 21:09 | Open on social.coop
Ilya Zverev replied to Ilya

Today, brownouts start for OAuth1a endpoints. In a month, only OAuth2 can be used.

One of my services using OAuth1 is OSM Authentication Proxy. Since storing passwords is bad, and OAuth sometimes is too hard to implement (you need a browser!), I made this proxy.

Essentially it's a website that says "yes, the person with the token is indeed an OSM user". It doesn't upload anything to OSM API.

I thought of using it for command-line tools and plugins, but ended up not.

auth.osmz.ru/
1 May at 12:10 | Open on en.osm.town
Ilya Zverev replied to Ilya

Command-line applications have a hard time with OAuth, because it requires a browser. The auth flow has so many steps, it was much easier to just give up and use Basic Auth with a password.

Taking a hint from a Google's library, I made cli-oauth2: a Python library that makes authenticating a one-line task.

github.com/Zverik/cli-oauth2

Fun fact: the idea came when I was rewriting Level0 for command-line. Didn't get it to work (yet haha), but there's one less problem to solve.

2 May at 9:38 | Open on en.osm.town
Ilya Zverev replied to Ilya

This one came up yesterday, while preparing for @organicmaps GSoC student work.

When developing an editor, you need to work with OSM Sandbox, a dev copy of API with no data. Sometimes it's frustrating because complex data is where an editor breaks. Usually I downloaded an OSM extract in JOSM, fixed ids, and uploaded it to the Sandbox, but on the 100th time I gave up.

github.com/Zverik/osm_to_sandb

This script helps you transfer a bbox worth of data in two commands, one of which is pip install.

This one came up yesterday, while preparing for @organicmaps GSoC student work.

When developing an editor, you need to work with OSM Sandbox, a dev copy of API with no data. Sometimes it's frustrating because complex data is where an editor breaks. Usually I downloaded an OSM extract in JOSM, fixed ids, and uploaded it to the Sandbox, but on the 100th time I gave up.

3 May at 6:36 | Open on en.osm.town
Organic Maps replied to Ilya

@zverik Does the script also change IDs? What does "fix ids" mean? For readers' info, Organic Maps Editor doesn't store IDs and doesn't rely on them.

5 May at 17:25 | Open on fosstodon.org
InsertUser replied to Organic

@organicmaps
I'd guess it flips them to be negative and resets any version numbers so that the dev server recognises them as new and assigns IDs to them rather than rejecting them as unknown.
@zverik

5 May at 18:32 | Open on en.osm.town
Ilya Zverev replied to Organic

@organicmaps To upload objects to the sandbox, you need to give them negative ids and keep the references. This is not related to OM, just a low-level API stuff.

6 May at 10:48 | Open on en.osm.town
Ilya Zverev replied to Ilya

Okay I skipped three days, so here are three tweets on a big thing I did at Maps.Me. It's on the deep end of the iceberg.

In short, I was tasked with bringing subway networks to the app. Which was based on OSM data, so naturally I thought how to fix the data model: every city had its own tagging schema.

To monitor the process, I wrote the validator, which now powers @organicmaps :

cdn.organicmaps.app/subway/ind

Alexey later improved it, a lot. Now there are over 300 cities, all uniformly mapped!

Okay I skipped three days, so here are three tweets on a big thing I did at Maps.Me. It's on the deep end of the iceberg.

In short, I was tasked with bringing subway networks to the app. Which was based on OSM data, so naturally I thought how to fix the data model: every city had its own tagging schema.
6 May at 19:23 | Open on en.osm.town
Ilya Zverev replied to Ilya

It was made possible with planning, iterating, and preparing a detailed tagging schema that incorporated most tagging practices:

wiki.openstreetmap.org/wiki/Me

It started as a proposal, which failed the voting. Then I made another proposal, but didn't have the nerve to go through voting the 2nd time.

But also I noticed how most objections come from just a few people in EU, so I just started tidying up networks in many cities, and when we passed 80 (with help of other OSMers), it became the standard.

It was made possible with planning, iterating, and preparing a detailed tagging schema that incorporated most tagging practices:

wiki.openstreetmap.org/wiki/Me

It started as a proposal, which failed the voting. Then I made another proposal, but didn't have the nerve to go through voting the 2nd time.
6 May at 19:37 | Open on en.osm.town
Ilya Zverev replied to Ilya

At that point I was ready to tackle the general public transport schema. After all, PTv2 is impossible to route over and a pain to use.

So, with experience in processing PT data for routing and validation, I generalized it for all kinds of transport, and presented at @sotm in Milan:

wiki.openstreetmap.org/wiki/Pr

Technically it's flawless. It has full backward compatibility, easy to map, tagging is pretty and conscise.

But at that point I got burnt out at my job and couldn't make the final step.

At that point I was ready to tackle the general public transport schema. After all, PTv2 is impossible to route over and a pain to use.

So, with experience in processing PT data for routing and validation, I generalized it for all kinds of transport, and presented at @sotm in Milan:

wiki.openstreetmap.org/wiki/Pr
6 May at 19:45 | Open on en.osm.town
Ilya Zverev replied to Ilya

(should mention that there are TONS of nuances that don't fit into tweets.)

Two main issues with the proposal that don't make it a perfect one:

- It's too wordy, nobody would read it, despite the core idea is very simple (stop nodes).

- It challenges the current tram stop mapping (and nothing else).

The new PT schema should've been perfect in 2018 to be approved, and now it should be double-perfect, otherwise it won't pass any discussion. Everybody in OSM has their own opinion on PT mapping.

6 May at 19:55 | Open on en.osm.town
Ilya Zverev replied to Ilya

Keeping an up-to-date rendering database means relying on worldwide replication streams from osm.org or per-country streams from @geofabrik . But what if I want my own extract area?

In 2014 I dug into osm2pgsql's "slim" tables, and wrote a script to trim the data outside a given polygon:

github.com/Zverik/regional

I use it for my "veloroad" tile server, but not sure if it works: the database grows pretty fast. Maybe it's just because people are mapping more than ten years ago.

8 May at 7:23 | Open on en.osm.town
Ilya Zverev replied to Ilya

This one is new. Couple days ago I released @everydoor 5.0, and for it I made a new thing.

GeoScribble takes inspiration from OpenStreetBugs, which was where we put our OSM notes before 2013. Just a simple server with no auth and a few fast endpoints.

wiki.openstreetmap.org/wiki/Ge

The idea is, you draw lines and leave short notes on the map. Just like with walking papers.

I see it already being used in multiple countries. The layer can be added to @josmeditor and Rapid, or browsed online.

This one is new. Couple days ago I released @everydoor 5.0, and for it I made a new thing.

GeoScribble takes inspiration from OpenStreetBugs, which was where we put our OSM notes before 2013. Just a simple server with no auth and a few fast endpoints.

wiki.openstreetmap.org/wiki/Ge

The idea is, you draw lines and leave short notes on the map. Just like with walking papers.
8 May at 7:49 | Open on en.osm.town
TheStroyer replied to Ilya

@zverik @everydoor @josmeditor wow, that looks like it can improve the editing workflow a lot

8 May at 12:11 | Open on mastodon.social
Ilya Zverev replied to TheStroyer

@TheStroyer @everydoor @josmeditor

Indeed! Just last Sunday I was walking with my friends in a forest, and surveyed a few streams and boardwalks this way. They would be lost if not for the drawing feature.

Editing ways properly (e.g. in @vespucci_editor ) needs too much involvement, compared to just a single finger movement in ED.

8 May at 14:27 | Open on en.osm.town
TheStroyer replied to Ilya
vespucci replied to Ilya

@zverik @TheStroyer @everydoor @josmeditor why draw? just record a GPX track ...

PS: in a forest you probably want to use a DTM anyway for tracing.

PPS: not to mention that you are massively overstating the effort to simply directly add things.

8 May at 15:23 | Open on en.osm.town
Ilya Zverev replied to Ilya

Since we're mentioning @josmeditor , here's one thing I made a long time ago:

josm.ru/

Yeah, that's a proper landing page (in Russian), with a few buttons, shortcuts to most important pages like a forum thread or a tag list, and a tutorial video.

I even browsed the changelog and added interesting changes to the feed, but stopped in 2020. I still use the page to download updates though.
9 May at 13:01 | Open on en.osm.town
Ilya Zverev replied to Ilya

I'm a bit out of breath, but def not out of projects :) Gonna keep doing this until I get an answer from NLNet.

In 2010 Microsoft granted to OSM permission to trace Bing imagery. It was the only detailed imagery layer we had in Russia, so that enabled making a validator that found illegal imagery usage (google / yandex):

vakhtyor.osmz.ru/

Basically it watched where people uploaded buildings and checked for available Bing imagery.

In 2014 we got Mapbox layer, and I turned this off.
11 May at 18:34 | Open on en.osm.town
Ilya Zverev replied to Ilya

There are different kinds of imports. Safest are those done by hand, but also the dirtiest, in my opinion: it's easy to miss or to get lazy and just press upload.

For towns and villages, the best source we had was GNS, an american database of toponyms. I converted it to OSM format and wrote a short manual on copying it onto the map:

gns.osmz.ru/

Interesting that while box=yes parameter doesn't work on osm.org nowadays, parameters minlat, maxlat etc still do.
11 May at 18:44 | Open on en.osm.town
rugk replied to Ilya

@zverik
Hmm giving out tokens on a HTTP site does not sound secure, does it?

2 May at 14:55 | Open on chaos.social
Ilya Zverev replied to rugk

@rugk yeah I decided not to set up certificates given nobody uses the service :)

2 May at 15:58 | Open on en.osm.town
Simon Poole replied to Ilya

"There are still no links to communities anywhere on osm.org." @zverik every time you use iD and then there's a whole very visible tab dedicated to the subject openstreetmap.org/communities

2 May at 5:56 | Open on en.osm.town
Ilya Zverev replied to Simon

@simon *every time you upload a change in iD — which is a pretty long way to a link.

On the tab there's a list of Local Chapters, essentially legal entities. Works for a business, too much for a person. I just want a link to a forum at least, or that localized panel from iD ideally, visible at all times on the main page.

2 May at 8:45 | Open on en.osm.town
Andy Allan replied to Ilya

@zverik @simon I intend to make much more use of the OCI integration into openstreetmap-website, but I'm juggling a lot of different things.

I would like it so that when you set your home location, you see the list of local communities (taken from OCI) on your dashboard.

2 May at 9:30 | Open on m.gravitystorm.co.uk
OpenStreetMap Ops Team replied to Ilya

@zverik it is a tough one, yes there are some legitimate uses of bulk downloading, but most of the tiles are never viewed. If we accept bulk downloading it will have an negative impact on others seeing fresh tiles, which is a particular concern during vandalism. We should make a clearer metric for the served fresh:stale ratio. EU week daytime hours have a very poor ratio. With some development effort the tile service could have a way to be told the request is bulk, changing render/caching logic.

11 May at 3:07 | Open on en.osm.town
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