Re: [OSM-dev] Generalisation

2018-04-15 Thread Daniel Koć
W dniu 15.04.2018 o 21:54, Frederik Ramm pisze:
> On 04/14/2018 11:18 AM, Tomas Straupis wrote:
>>   As OSM is mature enough to start generalisation (more than
>> "selection" operator), maybe there is some place where such topics (in
>> OSM context) are discussed in English?
> The most likely location for this to be discussed is probably within the
> openstreetmap-carto developer community as they would benefit most from
> such approaches. I don't follow their work closely though so couldn't
> say if the issues have been discussed in the past.

I remember that we in the osm-carto community were mentioning about
generalizations for some time, but it is just loosely scattered here and
there and we've never focused on this. I've heard quite interesting
things about this technique in a Paul Norman's talk from last year (the
exact section is here: https://youtu.be/g2HYYADa8XI?t=1h36s ).

I think it's the best to discuss this topic on the forum, because it's
much broader than any single ticket should contain, and it might be
interesting for rendering other styles too:

https://forum.openstreetmap.org/viewforum.php?id=100

-- 
"My method is uncertain/ It's a mess but it's working" [F. Apple]



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Re: [OSM-dev] Generalisation

2018-04-15 Thread Tomas Straupis
Hello

2018-04-15 22:54 GMT+03:00 Frederik Ramm wrote:
> The most likely location for this to be discussed is probably within the
> openstreetmap-carto developer community as they would benefit most from
> such approaches. I don't follow their work closely though so couldn't
> say if the issues have been discussed in the past.

  Good point. I'll watch openstreetmap-carto.

>>   Also, maybe there are ideas to translate the thesis mentioned above
>> to English?
> I'm not aware of any plans, but I do know that Arne has quoted similar
> work done by others, and there were many English-language works among
> that, so perhaps if you skim through his literature list at the end of
> the PDF you'll find interesting articles.

  I'm already buried in pdf's from google scholar :-) You start with
one paper, then open references, then references in references and
here you are the "wikipedia effect".

  The point is that Arne's work looks (from what I did understand) at
generalising openstreetmap data, while most papers look at general
data. This is important because OSM tagging does help a lot. Some
generalisation can be done much easier with OSM data because of
additional tags and you can add additional tags describing some real
properties (not designed for the sole purpose of generalisation) of an
objects which could help generalisation. For example with road
generalisation, a lot is written on intersection generalisation.
Having *_link ways or ref tags in OSM helps this effort a lot. Railway
network also has different subtags like main/siding/spur etc. which
also helps a lot. So while generalisation is generalisation anywhere,
but generalisation of OSM data does have some important and useful
differences/advantages.

  Another interesting thing is recalculating/updating generalised
data. "OSM way" is to update very often. So it is important to be able
to recalculate generalised data only on impacted part and it is not as
trivial as calculating "dirty tiles".

  I do not know how much of that is covered in Arne's thesis. Will try
to read/translate German version if there are no plans for
translation.

  Thank you!

-- 
Tomas

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Re: [OSM-dev] Generalisation

2018-04-15 Thread Frederik Ramm
Hi,

On 04/14/2018 11:18 AM, Tomas Straupis wrote:
>   As OSM is mature enough to start generalisation (more than
> "selection" operator), maybe there is some place where such topics (in
> OSM context) are discussed in English?

The most likely location for this to be discussed is probably within the
openstreetmap-carto developer community as they would benefit most from
such approaches. I don't follow their work closely though so couldn't
say if the issues have been discussed in the past.

I'm sure Arne himself would be happy to participate but I hear he's gone
on holiday after completing his thesis ;)

>   Also, maybe there are ideas to translate the thesis mentioned above
> to English?

I'm not aware of any plans, but I do know that Arne has quoted similar
work done by others, and there were many English-language works among
that, so perhaps if you skim through his literature list at the end of
the PDF you'll find interesting articles.

Best
Frederik

-- 
Frederik Ramm  ##  eMail frede...@remote.org  ##  N49°00'09" E008°23'33"

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