<div dir="ltr">Hello, <div><br></div><div>Can you please share the data mining techniques can be employed on OSM data.</div><div><br></div><div>regards</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Aug 18, 2014 at 5:30 PM, <span dir="ltr"><<a href="mailto:dev-request@openstreetmap.org" target="_blank">dev-request@openstreetmap.org</a>></span> wrote:<br>
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Today's Topics:<br>
<br>
1. How to handle these issues? (Sandor Seres)<br>
2. Re: How to handle these issues? (Mateusz Konieczny)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Sun, 17 Aug 2014 15:04:19 +0200<br>
From: "Sandor Seres" <<a href="mailto:sandors39@gmail.com">sandors39@gmail.com</a>><br>
To: <<a href="mailto:dev@openstreetmap.org">dev@openstreetmap.org</a>><br>
Subject: [OSM-dev] How to handle these issues?<br>
Message-ID: <00cd01cfba1b$c3091770$491b4650$@<a href="http://gmail.com" target="_blank">gmail.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
I am not quite shore how to handle the following two dilemmas:<br>
<br>
1.If a rendering system renders the planet-sea area objects (instead of<br>
planet-land area objects), is then Antarctica a hole in the global ocean<br>
object or the global ocean object simply ends by the upper border-line of<br>
Antarctica?<br>
<br>
2.There are around 25460 objects in the class defined by the tag<br>
natural=land in the latest dump. The wiki documentation for the same tag<br>
says "This tag should not be used". How to interpret this?<br>
<br>
Are editors refusing data with this tag? Should we ignore the data with this<br>
tag in the dumps? Looking at different OSM based maps I see that I am not<br>
the only one confused with the issue. Unfortunately, the class contains area<br>
objects related to all water types/classes so, this is not just<br>
<br>
rendering them at certain stage. In vector mapping, as you certainly know,<br>
it is much more complicated.<br>
<br>
Thanks for suggestions/meanings.<br>
<br>
Sandor<br>
<br>
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Message: 2<br>
Date: Sun, 17 Aug 2014 18:51:43 +0200<br>
From: Mateusz Konieczny <<a href="mailto:matkoniecz@gmail.com">matkoniecz@gmail.com</a>><br>
Cc: <a href="mailto:dev@openstreetmap.org">dev@openstreetmap.org</a><br>
Subject: Re: [OSM-dev] How to handle these issues?<br>
Message-ID:<br>
<<a href="mailto:CALDvra60Pa6-L8YPaFSXx8B03mrePz905dgtQ%2BW80_YLgdb1QA@mail.gmail.com">CALDvra60Pa6-L8YPaFSXx8B03mrePz905dgtQ+W80_YLgdb1QA@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
ad 2)<br>
- natural=land tag was used<br>
- multipolygons were used to achieve the same goal<br>
- multipolygons are better (solution of general problem), so natural=land<br>
was described as bad idea<br>
- existing natural=land gets replaced by multipolygons what is ongoing<br>
process (see<br>
<a href="http://taginfo.openstreetmap.org/tags/natural=land#map" target="_blank">http://taginfo.openstreetmap.org/tags/natural=land#map</a> for progress - for<br>
example in central Europe this tag is gone or was never used)<br>
- JOSM since <a href="https://josm.openstreetmap.de/changeset/7391/josm" target="_blank">https://josm.openstreetmap.de/changeset/7391/josm</a> encourages<br>
users to update tagging (4 days ago)<br>
<br>
Tag may be either used to use full available data or be ignored to make<br>
data processing easier and encourage update of tagging.<br>
<br>
<br>
2014-08-17 15:04 GMT+02:00 Sandor Seres <<a href="mailto:sandors39@gmail.com">sandors39@gmail.com</a>>:<br>
<br>
> I am not quite shore how to handle the following two dilemmas:<br>
><br>
> 1.If a rendering system renders the planet-sea area objects (instead of<br>
> planet-land area objects), is then Antarctica a hole in the global ocean<br>
> object or the global ocean object simply ends by the upper border-line of<br>
> Antarctica?<br>
><br>
> 2.There are around 25460 objects in the class defined by the tag<br>
> natural=land in the latest dump. The wiki documentation for the same tag<br>
> says ?This tag should not be used?. How to interpret this?<br>
><br>
> Are editors refusing data with this tag? Should we ignore the data with<br>
> this tag in the dumps? Looking at different OSM based maps I see that I am<br>
> not the only one confused with the issue. Unfortunately, the class contains<br>
> area objects related to all water types/classes so, this is not just<br>
><br>
> rendering them at certain stage. In vector mapping, as you certainly know,<br>
> it is much more complicated.<br>
><br>
> Thanks for suggestions/meanings.<br>
><br>
> Sandor<br>
><br>
> _______________________________________________<br>
> dev mailing list<br>
> <a href="mailto:dev@openstreetmap.org">dev@openstreetmap.org</a><br>
> <a href="https://lists.openstreetmap.org/listinfo/dev" target="_blank">https://lists.openstreetmap.org/listinfo/dev</a><br>
><br>
><br>
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End of dev Digest, Vol 113, Issue 7<br>
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