[mkgmap-dev] splitter r609 released

Wed Jun 30 07:55:56 BST 2021

okay yeah I think I misunderstood the polygon-file a bit. But why is the
split for Norway so much worse now? Before it was possible to get it down
to 115 tiles (using the polygon-file option) now its 168 instead. Not using
polygon-file no change. (guess the 1 tile more is maybe added data
somewhere).

On Wed, 30 Jun 2021 at 07:59, Gerd Petermann <
gpetermann_muenchen at hotmail.com> wrote:

> Hi Felix,
>
> reg. Saarland: I'll try to reproduce. Looks like an error.
> reg. Liechtenstein:
> I think we still have different ideas what the polygon-file option is
> about.
> The documentation is a bit outdated since r433 (see
> https://www.mkgmap.org.uk/websvn/revision.php?repname=splitter&rev=433 )
> but the basic idea was that splitter should try to produce tiles which
> don't overlap the given polygon too much. This sometimes means that it
> produces more and smaller tiles.
> Splitter should be able to find good splits for geofabrik downloads
> without a polygon-file, but there are use cases: If the user only wants a
> part of a download in the map they can use the corresponding polygon.
>
> You seem to suggest that splitter should just use the polygon to be able
> to ignore data that is in the input file but not in the polygon and never
> try to fit the tiles into the polygon?
>
> Gerd
>
>
>
>
>
>
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Dienstag, 29. Juni 2021 23:04
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] splitter r609 released
>
> I found (server) time to run my test again - using splitter v614 - search
> limit 1000000
> Problem cases in bold. I also added the number of tiles that splitter v602
> needed (well on one week older geofabrik extract - but that should not make
> such a difference for Norway or South America). I feel 602 with
> search-limit 1000000 was producing more consistent results.
>
> "for netherlands use polygon-file - cnt1 = 93 cnt0 = 88"
> "for alps do not use polygon-file - cnt1 = 225 cnt0 = 226"
> "for liechtenstein do not use polygon-file - cnt1 = 1 cnt0 = 6"
> I thought that the new version fixes the splitting if it is not actually
> needed.
>
> "for monaco do not use polygon-file - cnt1 = 1 cnt0 = 2"
> "for slovenia do not use polygon-file - cnt1 = 27 cnt0 = 28"
> "for ukraine use polygon-file - cnt1 = 62 cnt0 = 61"
> "for norway do not use polygon-file - cnt1 = 129 cnt0 = 168"
> Big degradation here - with the older splitter it was: "for norway use
> polygon-file - cnt1 = 128 cnt0 = 115" (also using 1000000 search limit)
>
> "for switzerland do not use polygon-file - cnt1 = 29 cnt0 = 30"
> "for poland do not use polygon-file - cnt1 = 127 cnt0 = 128"
> "for sweden use polygon-file - cnt1 = 60 cnt0 = 54"
> "for finland do not use polygon-file - cnt1 = 65 cnt0 = 84"
> "for czech-republic use polygon-file - cnt1 = 63 cnt0 = 62"
> "for denmark use polygon-file - cnt1 = 33 cnt0 = 32"
> "for austria use polygon-file - cnt1 = 56 cnt0 = 54"
> "for andorra do not use polygon-file - cnt1 = 1 cnt0 = 4"
> "for estonia use polygon-file - cnt1 = 9 cnt0 = 8"
> "for saarland use polygon-file - cnt1 = 4 cnt0 = 0"
> Seems using a polygon-file no spit at all - however it should still write
> the data again out into the newly defined filename.
>
> "for hamburg do not use polygon-file - cnt1 = 3 cnt0 = 12"
> "for hessen do not use polygon-file - cnt1 = 17 cnt0 = 18"
> "for bayern do not use polygon-file - cnt1 = 47 cnt0 = 48"
> "for berlin do not use polygon-file - cnt1 = 5 cnt0 = 13"
> "for australia-oceania use polygon-file - cnt1 = 112 cnt0 = 109"
> "for south-america do not use polygon-file - cnt1 = 335 cnt0 = 463"
> old splitter "for south-america do not use polygon-file - cnt1 = 337 cnt0
> = 339"  (using default search limit)
>
> "for africa do not use polygon-file - cnt1 = 653 cnt0 = 663"
> "for asia use polygon-file - cnt1 = 1697 cnt0 = 1549"
> "for russia use polygon-file - cnt1 = 429 cnt0 = 408"
> 0ld identical
>
> "for central-america use polygon-file - cnt1 = 60 cnt0 = 58"
> "for antarctica use polygon-file - cnt1 = 7 cnt0 = 6"
> "for morocco do not use polygon-file - cnt1 = 19 cnt0 = 27"
> old identical
>
> "for congo-democratic-republic do not use polygon-file - cnt1 = 37 cnt0 =
> 38"
> "for mozambique use polygon-file - cnt1 = 24 cnt0 = 23"
> "for azerbaijan do not use polygon-file - cnt1 = 3 cnt0 = 4"
> "for malaysia-singapore-brunei do not use polygon-file - cnt1 = 16 cnt0 =
> 17"
> "for china use polygon-file - cnt1 = 104 cnt0 = 101"
> "for india do not use polygon-file - cnt1 = 109 cnt0 = 112"
> "for indonesia do not use polygon-file - cnt1 = 175 cnt0 = 200"
> "for japan use polygon-file - cnt1 = 163 cnt0 = 160"
> "for philippines do not use polygon-file - cnt1 = 50 cnt0 = 51"
> "for afghanistan do not use polygon-file - cnt1 = 11 cnt0 = 20"
> old identical
>
> "for australia use polygon-file - cnt1 = 67 cnt0 = 66"
> "for argentina use polygon-file - cnt1 = 31 cnt0 = 27"
> "for brazil use polygon-file - cnt1 = 176 cnt0 = 172"
> "for chile do not use polygon-file - cnt1 = 31 cnt0 = 33"
> "for paraguay use polygon-file - cnt1 = 17 cnt0 = 16"
> "for us-midwest do not use polygon-file - cnt1 = 152 cnt0 = 154"
> "for us-northeast do not use polygon-file - cnt1 = 109 cnt0 = 110"
> "for us-pacific use polygon-file - cnt1 = 20 cnt0 = 18"
> "for us-south do not use polygon-file - cnt1 = 259 cnt0 = 261"
> "for us-west do not use polygon-file - cnt1 = 224 cnt0 = 227"
> "for greenland use polygon-file - cnt1 = 4 cnt0 = 2"
> "for mexico use polygon-file - cnt1 = 43 cnt0 = 42"
> "for reunion do not use polygon-file - cnt1 = 3 cnt0 = 5"
>
> On Fri, 25 Jun 2021 at 16:51, Gerd Petermann <
> GPetermann_muenchen at hotmail.com<mailto:GPetermann_muenchen at hotmail.com>>
> wrote:
> Hi all,
>
> I think with r609 there should be no need to use a polygon file. See
> https://www.mkgmap.org.uk/websvn/revision.php?repname=splitter&rev=609
>
> Please let me know when this version produces much worse results compared
> to older releases (using the same options and input) and provide the files
> densities-out.txt and the log.
>
> If you are interested in good splits you should check the splitter log for
> "Solution is not nice. Can't find a better solution"
>
> When this is printed splitter did not find a good split. Expect almost
> empty tiles in this case.
> It is likely that this happens when rather small files are split with a
> polygon and the default resolution. Normal users don't do this, but some
> map providers try to use the same options for very different downloads ...
>
> Gerd
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk<mailto:mkgmap-dev at lists.mkgmap.org.uk>
> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
>
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
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