[mkgmap-dev] splitter: option for maximum tile area?

Sat Nov 3 10:38:04 GMT 2018

Hi Bernhard,

please post a link to one of the files produced by splitter. If the sum of file sizes is much larger than the input file that means that each file
contains a lot of data that was written to keep ways complete. Maybe srtm2osm creates lots of very long ways ?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Bernhard Hiller <bhil at gmx.de>
Gesendet: Samstag, 3. November 2018 11:25
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] splitter: option for maximum tile area?

Hi Gerd,
contour lines were created with srtm2osm  -step 25 -cat 500 100 25
-large with 3" elevation data downloaded from viewfinderpanoramas.
The mkgmap parameters contain "--add-pois-to-areas", but no
"--add-pois-to-lines" (the splitter parameters contain neither - as Ralf
said).
The style for contour lines is simple:
contour=elevation & ele<=0 { delete contour; }
contour=elevation & contour_ext=elevation_major  { name
'${ele|conv:m=>ft}'; } [0x22 level 4]
contour=elevation & contour_ext=elevation_medium { name
'${ele|conv:m=>ft}'; } [0x21 level 2]
contour=elevation & contour_ext=elevation_minor  { name
'${ele|conv:m=>ft}'; } [0x20 level 0]
There are no rules for contours in the points and polygons file. The
options file defines the levels only.

Running splitter on the contour lines file only, creates several pdb
files summing up to 4.5 GB
=> the problem is with the contour lines.

Next, I'll try to cut Laos from the contour lines file and create a
contour lines map of Laos only...

Kind regards,
Bernhard

Am 02.11.2018 um 19:31 schrieb Gerd Petermann:
> Hi Bernhard,
>
> just a guess: If you use option --add-pois-to-lines and you have a rule in the points file which processes ele to add a POI
> you may see something like that.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Freitag, 2. November 2018 19:24
> An: Bernhard Hiller; Development list for mkgmap
> Betreff: Re: [mkgmap-dev] splitter: option for maximum tile area?
>
> Hi Bernhard,
>
> what are your rules for the contour lines?
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Bernhard Hiller <bhil at gmx.de>
> Gesendet: Freitag, 2. November 2018 19:18
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: Re: [mkgmap-dev] splitter: option for maximum tile area?
>
> Hi all,
> still struggling with that strange issue. But I guess I found some hint
> to the cause: inconsistent file sizes.
> - extracted OSM data: 400 MB pbf
> - elevation contour lines: 600 MB pbf
> - merged file: 1 GB pbf
> So far, sizes are consistent.
>
> When I run splitter on the OSM data only file, it produces many tiles
> summing up to some 400 MB. Consistent, too. When I run mkgmap on this
> output, I get a map within about half an hour, and it looks OK (tested
> with QLandkarte).
>
> When I run splitter on the merged file, the tiles sum up to some 9 GB.
> That is 9 times the size I'd expect. mkgmap can render several of those
> tiles (but very slowly); and then crashes on one of them with an
> OutOfMemory exception.
>
> So I think that the problem is somewhere in those contour lines, either
> when merged or alone.
> I'll try to create a contour lines only map as the next step to test
> this hypothesis.
>
> Kind regards,
> Bernhard
>
> Am 01.11.2018 um 09:32 schrieb Gerd Petermann:
>> Hi Bernhard,
>>
>> I tried to reproduce the memory problems with tile 47120005. I don't think that the sea itself is a problem here, at least not when you use the --precomp-sea option. It took only 15 secs to process that tile with asia data from August with the default style and typical options for routing etc.
>> My input file didn't contain SRTM data so I assume this is the reason. Maybe you have many contour lines with ele= your data?
>>
>> Gerd
>>
>> ________________________________________
>> Von: Gerd Petermann <gpetermann_muenchen at hotmail.com>
>> Gesendet: Mittwoch, 31. Oktober 2018 22:49
>> An: Gerd Petermann; Development list for mkgmap
>> Betreff: AW: [mkgmap-dev] splitter: option for maximum tile area?
>>
>> Hi Bernhard,
>>
>> looked again at the splitter command in your last post. You also use a rather high max-nodes value.
>> Such a high value means that you get rather large tiles and that mkgmap needs more memory for each tile
>> compared to the default 1400000. Many users use a value near 1200000.
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
>> Gesendet: Mittwoch, 31. Oktober 2018 22:20
>> An: Development list for mkgmap
>> Betreff: Re: [mkgmap-dev] splitter: option for maximum tile area?
>>
>> Hi Bernhard,
>> there is no option for this. Do you use option --precomp-sea in splitter? Maybe you use --no-trim ?
>> If that doesn't help you can try to change the values for
>> private static final int MAX_LAT_DEGREES =
>> private static final int MAX_LON_DEGREES =
>> in SplittableDensityArea.java and compile your own version of splitter.
>>
>> Gerd
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Bernhard Hiller <bhil at gmx.de>
>> Gesendet: Mittwoch, 31. Oktober 2018 22:03
>> An: mkgmap-dev at lists.mkgmap.org.uk
>> Betreff: [mkgmap-dev] splitter: option for maximum tile area?
>>
>> Hi all,
>> currently a Java OutOfMemory exception prevents me from creating a map.
>> I already use option --max-jobs=he machine has 4 physical cores) and
>> -Xmx5G (of 8 GB installed). Beyond OSM data, the map contains DEM and
>> elevation contour lines.
>>    From the tiles finished and those with a new timestamp but about 0
>> bytes length, I can see that mkgmap was rendering tiles 47120005,
>> 47120006, 47120007 at the time of crash.
>> Tile 47120005 is extremely large by physical area - some 6° x 5.5° (see
>> attached file), covering a lot of the south chinese sea, i.e. there are
>> not many actual data in that area.
>> I guess that the problem arises with that tile. I remember some case in
>> the past where a single tile covering such a large area of mainly sea
>> caused mkgmap to take an enormous amount of time for rendering - also
>> here, mkgmap already spent about 1 hour before crashing.
>> So I'd like to ask: is there some possibility for limiting the area of a
>> tile among the splitter options?
>> Kind regards,
>> Bernhard
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
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