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<p>Thanks Gerd</p>
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<p>On 2015-05-22 09:34, Gerd Petermann wrote:</p>
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<div dir="ltr">Hi Colin,<br /><br />it turned out that your concerns were okay,<br />the differences in the UK are much higher,<br />so I've implemented a new option wanted-admin-level.<br /><br />See also post for splitter 423.<br /><br />Gerd<br /><br /><br />
<div><hr id="stopSpelling" />From: gpetermann_muenchen@hotmail.com<br />To: mkgmap-dev@lists.mkgmap.org.uk<br />Date: Thu, 21 May 2015 18:56:46 +0200<br />Subject: Re: [mkgmap-dev] Duplicate cities<br /><br />
<div dir="ltr">Hi Colin,<br /><br />It would not be complicated to implement, but I fear the documentation.<br />Today I've tested with Brazil, once with levels 4-11, once with 5-11.<br />Size difference was only 10MB (sum for all 27 tiles), <br />so I don't expect a big change in the UK<br />when you would use e.g. 6-11.<br /><br />I'll think about a good option name and docu for it,<br />if I find one I'll add it.<br />Suggestions are wellcome.<br /><br />Gerd<br /><br />
<div><hr id="ecxstopSpelling" />Date: Thu, 21 May 2015 18:44:32 +0200<br />From: colin.smale@xs4all.nl<br />To: mkgmap-dev@lists.mkgmap.org.uk<br />Subject: Re: [mkgmap-dev] Duplicate cities<br /><br /> Well, I am thinking that the whole of the boundary of Scotland for example (level 5 is the region, level 4 is the nation - they are coterminous) will add an enormous overhead to all the tiles in Scotland. Maybe it isn't worth it, especially if you say it is complex to implement.<br /> As an aside, what happens to tiles which are entirely enclosed by a boundary, without there being a node within the tile?<br /> //colin<br />
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On 2015-05-21 18:31, Gerd Petermann wrote:<br />
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<div dir="ltr">Hi Colin,<br /><br />what difference do you expect when you <br />are able to configure that value?<br />I'd expect a few MB difference in the OSM file size<br />and nearly no difference in mkgmap output,<br />on the other hand it woud be another complicated<br />option.<br /><br />Gerd<br /><br />
<div><hr id="ecxstopSpelling" />Date: Thu, 21 May 2015 18:25:12 +0200<br />From: colin.smale@xs4all.nl<br />To: mkgmap-dev@lists.mkgmap.org.uk<br />Subject: Re: [mkgmap-dev] Duplicate cities<br /><br /> Could the admin_levels be made configurable in some way? There are considerable differences in the size of these areas between different countries. I am thinking particularly of the lower admin_level (5) which might be better set to 6 (or even 8) in the UK. Level 5 corresponds to "regions" which are basically only for statistics and some government stuff - not many people would know what region they are in (except they could probably guess because they are called things like "South East England"). Level 6 corresponds to Counties, and everyone uses them.<br /> //colin<br />
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On 2015-05-21 17:00, Gerd Petermann wrote:<br />
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<div dir="ltr">Hi Andrzej,<br /><br />I tried using --boundary-tags=administrative <br />for splitter, the amount of additional data depends<br />on the size of the largest boundaries.<br /><br />Attached is a small patch that changes splitter so<br />that it keeps administrative boundaries complete<br />when the admin_level is between 5 and 11 (including).<br /><br />This doesn't add much data to the output files<br />in comparison to --boundary-tags=administrative <br />when splitting e.g. Brazil with --max-nodes=800000<br />and --output=o5m:<br />a) r422 output size: ~ 359 M <br />b) patched version : ~381 M <br />c) unpatched r422 with --boundary-tags=administrative: 402 M<br /><br />I've also tested the effect on mkgmap.<br />As expected, version a) produces some wrong / duplicate POI,<br />but I don't see them for b) or c).<br />The throughput is nearly identical, and the final img size is also almost equal.<br /><br />So, I think the patch is the best compromise.<br /><br />Gerd<br /><br /><br />
<div>> Date: Thu, 21 May 2015 12:56:43 +0200<br />> From: popej@poczta.onet.pl<br />> To: mkgmap-dev@lists.mkgmap.org.uk<br />> Subject: Re: [mkgmap-dev] Duplicate cities<br />> <br />> Hi Gerd,<br />> <br />> > Hmm, splitter keeps most mp-relations complete, we only<br />> > exclude some boundary relations.<br />> <br />> I see. But maybe potential increase wouldn't be that big, if you add <br />> boundaries?<br />> <br />> Or maybe you can preserve only some levels of boundaries?<br />> <br />> Or you can use boundary data form --bounds option?<br />> <br />> Anyway, I prefer version 1 - keep complete relation, that could be <br />> useful for mkgmap.<br />> <br />> -- <br />> Best regards,<br />> Andrzej<br />> _______________________________________________<br />> mkgmap-dev mailing list<br />> mkgmap-dev@lists.mkgmap.org.uk<br />> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev</div>
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