In a github repo, you can create a wiki. Then “Wiki” appears in the repo next to “Issues” and “Pull Requests” and such as that. Just a suggestion. If you have plans for the docs, that is all good.

Really interesting ideas here.

First, I would encourage you to go ahead and put the information in this post into a wiki linked to one of your repos.

Second, geoparquet looks interesting and there is a lot there but that is, I would suggest, not a reason to give up on this effort. If geoparquet has to compete, that will be all for the better. It seems that it would be a good idea to have a geoparqet<–>oma/opa converter.

Third, can oma files be used to generate tiles? This might help make the format’s usefulness more obvious.

Fourth, are you testing your converters so that we can be confident of the round-trip behavior of a conversion into and then out of oma? I do not see a “tests” directory anywhere. :–)

And finally, would you object to things being done in python? I have a lot of experience working in java, but it would be good to have tools in other languages too.

Thanx and I look forward to putting up some PRs. - ray

@mmd thanx for the info. I have read the docs and I will re-read to try to understand them better. It’s not the most intuitive API I have ever seen. But I know there are reasons for this.

I am looking at the overpass API and it appears tobe not very difficult to get the information on a relation.

[out:json]; rel(5173237); (._;>;); out body;

That second is … very obvious, no? :- )

I think I still have to read just the top relation node from OSM API because overpass does not include the last edit time for the relation, and this seems important for checking the relation.

I plan on not fetching all the other data if a relation has not changed since the last check.

@ToniE Ah! I did not see that distinction. Thanx.

Well, good thing that I am trying to do this to find relations that need to be edited, for the benefit of the community.

I am trying to do something helpful, something that does not exist now. Is that ok with you guys?

@mmd How would it violate the policy? My app would be accessible under the same license as OSM. Or are you referring to something else? Which part of the policy?

I have been interested in looking at access to groceries and food in US cities. It seems that there is a need for tools that can work with OSM that do some of the following:

• identify how many Xs there are in geographical area Y
• export maps of the Xs in geographical area Y
• describe “coverage” or proximity measures of Xs in geographical area Y
• describe connectedness to transportation infrastructure of Xs in geographical area Y

We can’t all be wanting to re-invent these same wheels, yes?

Do you know of any tools for this? Or is there something you are using that may be generalizable?

Hello -

I am tempted to ask whether you have relations in OSM for the definitions of these districts. But it seems your use-case is much more complex than mine. I am tracking city and county boundaries in California.

Do districts in Turkmenistan geographically tile the country? Or do any overlap? Do you have any relations and ways for them?

For example, in the US, counties tile a state, so no spaces in a state are not in some county, but cities or towns do not tile any county.

When I have my site up, it may still be useful for someone doing what you are doing, to help track the integrity of the districts or the integrity of whatever is known about them. The differences are already giving me ideas about my app.

What are the column headings in the list you refer to above? Are those column headings? Google cannot seem to translate them. I expected something like “Name” or … something.

@rorym The most obvious thing that has occurred to me is that I can split the fetches I am doing into separate threads so that there can be some parallelization. I am fetching the data in calls similar to “curl ‘osm.org/api/0.6/relation/3529698’”, then finding the nodes and ways in this, collecting them into a list and then doing the same recursively. At the end, I see if every way endpoint matches up with the end of another way.

It would be most wondeful if something like osm.org/api/0.6/way/262738820 would return the nodes with their latitude and longitude included. When I just get a list 100 node ids for a way, one has to do 101 fetches and xml parses. Ick.

@ToniE It sounds as though what you are doing is quite a bit more complicated than what I am trying to do. Do you have your code accessible, such as via github. I would be interested in seeing what you doing. Perhaps some sub-part of that code would suggest something to me.

Well, that changeset does not re-create the relation. Interesting. It seems to me that one should be able to identify if the lines from the TIGER data are still there. I have not tried it, but it there should be something there.

And there is no changeset for the deletion? Perhaps that could be reversed….

Ah. I had forgotten about using that. And I still do not see a city.

I am doing the same thing (I think) in California. What are you using for admin_level, place and so on?

Can you provide the ids of a few of the relations for the entities you have identified?

cheers - ray

Ok. Makes sense. I guess loading all of those dbf files into mysql was probably not a good use of my time. :-) O well.

thanx.

I find Sunnyvale to be fairly completely mapped. But I may be missing problems with the data.

I often wish there was a way to look at a map and filter on the type of POI. Perhaps I want to look at all restaurants or all schools. There is no way to do this, yes? I could probably do it in Overpass, but my experience with relational db and tools does not make OP’s API intuitive.

In re the place tag, I just added “place=state” to the relation that is California. I am really not sure why that had not been done.

I am also interested in adding relations for geo entities that tile the map, such as school districts. Any suggestions or pointers would be appreciated. I found out how the County Registrar gets the boundary info on school districts. It is amusing. Going to diary it. Basically, the data is in TIGER but they do not use that. Instead, districts send them narratives like “this street, west side”, “that street, north side” so on. Very ouch!

What kind of tools did you use to pull this data out? I am a HOT mapper, and one of those who has never marked a tile as “Done”. There is information about the tile as a whole that just does not seem to be visible and I can never seem to have the confidence to so mark a tile.

I am becoming familiar with accessing OSM data via, for example, the overpy library in python. I think that one could get meta-information from a tile and that would help mappers know whether they could or should mark it is “Done”.

BTW, I am also familiar with R and other tools for data analysis. I would be curious about what you use. Thanx.

Someone mentioned these in an e-mail to a HOT list. It is apparently cassava.

See:

If you want, could take a look also at this aerial photo of cassava and its footnote (or others): [http://www.gettyimages.com/detail/photo/bangweulu-floodplain-zambia-aerial-view-of-high-res-stock-photography/72886297]

Yes, helpful comments. Thanx! - ray