[mkgmap-dev] mkgmap-dev Digest, Vol 162, Issue 25

Sun Jan 16 13:18:09 GMT 2022

Hi Gerd et al,

Downloaded 4865 and ran it to make a .GMAP with no changes to data nor
options

Compared with running v4286 (which works for me so I still use) :

MDR is now 43092K was 47347K

Runtime (reading .MP files) seemed slower, maybe 30% slower

Some .RGN files are bigger : now 5855K was 5823K, for example.

Searching in Basecamp runs with no problems.

Keep up the good work!

John

On Sun, 16 Jan 2022 at 12:00, <mkgmap-dev-request at lists.mkgmap.org.uk>
wrote:

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> Today's Topics:
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>    1. Please try and report results of Huffman compression
>       (Gerd Petermann)
>    2. Re: Please try and report results of Huffman      compression (7770)
>    3. Re: Please try and report results of Huffman      compression
>       (Gerd Petermann)
>
>
>
> ---------- Forwarded message ----------
> From: Gerd Petermann <GPetermann_muenchen at hotmail.com>
> To: "mkgmap-dev at lists.mkgmap.org.uk" <mkgmap-dev at lists.mkgmap.org.uk>
> Cc:
> Bcc:
> Date: Sat, 15 Jan 2022 15:59:24 +0000
> Subject: [mkgmap-dev] Please try and report results of Huffman compression
> Hi all,
>
> during the last weeks Ticker and I decoded Garmin's String compression of
> the global index for the PC (the *_mdr.img) .
> In the mdr2 branch I've coded support for that in mkgmap and I think its
> ready for a first beta test.
>
> It works with codepages 1250 ..1258 or 65001.
> I've no idea how the 2-byte pages work, but Garmin seems to support that,
> too. Maybe I'll work on this later.
>
> The branch version produces around 200 lines of diagnostic output to show
> what happens when compression is enabled.
> This will be changed to debug level later.
>
> The encoding is enabled by default, special option
> --x-no-mdr15-compression can be used to turn it off.
>
> Note that the size of the *_mdr.img file will be smaller (which is esp.
> intersting for those who get close to the 2G limit)
> Note also that a zipped *_mdr.img can and will be larger since zip cannot
> remove as much redundancy.
> Note also that this branch includes the changes from the faster-mp branch
> and introduces a few changes
> which are relavant for --lower-case maps.
>
> How to test?
> Install the map in MapSource and check if you see any unexpected
> characters in the result lists or maybe even crashes while searching.
> If so, please try the same input files with the --x-no-mdr15-compression
> to verify if this is caused by compression or maybe other changes.
>
> Please don't yet publish the maps, but let me know if you see anything
> unexpected. Some changes reg. lower-case in this branch are still
> experimental.
>
> The binary is here:
> https://www.mkgmap.org.uk/download/mkgmap-mdr2-r4865.zip
>
> If you see errors which are caused by compression, please attach the
> diagnostic output.
>
> @Ticker: Please review the source.
>
> Gerd
>
>
>
> ---------- Forwarded message ----------
> From: 7770 <7770 at foskan.eu>
> To: "mkgmap-dev at lists.mkgmap.org.uk" <mkgmap-dev at lists.mkgmap.org.uk>
> Cc:
> Bcc:
> Date: Sat, 15 Jan 2022 18:53:37 +0100
> Subject: Re: [mkgmap-dev] Please try and report results of Huffman
> compression
> Hi.
> https://files.mkgmap.org.uk/detail/544
>
> ALLVARLIG (MultiPolygonRelation): folder/77700046.osm.pbf: Internal error:
> Failed to render MultiPolygonRelation 2970267
> that was with --latin1
>
> mkgmap version 4839 works well.
>
>
> Regards
> Karl
>
> On lördag 15 januari 2022 16:59:24 CET Gerd Petermann wrote:
> > Hi all,
> >
> > during the last weeks Ticker and I decoded Garmin's String compression of
> > the global index for the PC (the *_mdr.img) . In the mdr2 branch I've
> coded
> > support for that in mkgmap and I think its ready for a first beta test.
> >
> > It works with codepages 1250 ..1258 or 65001.
> > I've no idea how the 2-byte pages work, but Garmin seems to support that,
> > too. Maybe I'll work on this later.
> >
> > The branch version produces around 200 lines of diagnostic output to show
> > what happens when compression is enabled. This will be changed to debug
> > level later.
> >
> > The encoding is enabled by default, special option
> --x-no-mdr15-compression
> > can be used to turn it off.
> >
> > Note that the size of the *_mdr.img file will be smaller (which is esp.
> > intersting for those who get close to the 2G limit) Note also that a
> zipped
> > *_mdr.img can and will be larger since zip cannot remove as much
> > redundancy. Note also that this branch includes the changes from the
> > faster-mp branch and introduces a few changes which are relavant for
> > --lower-case maps.
> >
> > How to test?
> > Install the map in MapSource and check if you see any unexpected
> characters
> > in the result lists or maybe even crashes while searching. If so, please
> > try the same input files with the --x-no-mdr15-compression to verify if
> > this is caused by compression or maybe other changes.
> >
> > Please don't yet publish the maps, but let me know if you see anything
> > unexpected. Some changes reg. lower-case in this branch are still
> > experimental.
> >
> > The binary is here:
> > https://www.mkgmap.org.uk/download/mkgmap-mdr2-r4865.zip
> >
> > If you see errors which are caused by compression, please attach the
> > diagnostic output.
> >
> > @Ticker: Please review the source.
> >
> > Gerd
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev at lists.mkgmap.org.uk
> > https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
>
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: Gerd Petermann <gpetermann_muenchen at hotmail.com>
> To: "mkgmap-dev at lists.mkgmap.org.uk" <mkgmap-dev at lists.mkgmap.org.uk>
> Cc:
> Bcc:
> Date: Sun, 16 Jan 2022 09:38:14 +0000
> Subject: Re: [mkgmap-dev] Please try and report results of Huffman
> compression
> Hi all,
>
> see https://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4866
> and https://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4867
>
> Please use https://www.mkgmap.org.uk/download/mkgmap-mdr2-r4867.zip for
> further tests.
>
> Gerd
>
> ________________________________________
> Von: 7770 <7770 at foskan.eu>
> Gesendet: Samstag, 15. Januar 2022 18:53
> An: mkgmap-dev at lists.mkgmap.org.uk
> Cc: Gerd Petermann
> Betreff: Re: [mkgmap-dev] Please try and report results of Huffman
> compression
>
> Hi.
> https://files.mkgmap.org.uk/detail/544
>
> ALLVARLIG (MultiPolygonRelation): folder/77700046.osm.pbf: Internal error:
> Failed to render MultiPolygonRelation 2970267
> that was with --latin1
>
> mkgmap version 4839 works well.
>
>
> Regards
> Karl
>
> On lördag 15 januari 2022 16:59:24 CET Gerd Petermann wrote:
> > Hi all,
> >
> > during the last weeks Ticker and I decoded Garmin's String compression of
> > the global index for the PC (the *_mdr.img) . In the mdr2 branch I've
> coded
> > support for that in mkgmap and I think its ready for a first beta test.
> >
> > It works with codepages 1250 ..1258 or 65001.
> > I've no idea how the 2-byte pages work, but Garmin seems to support that,
> > too. Maybe I'll work on this later.
> >
> > The branch version produces around 200 lines of diagnostic output to show
> > what happens when compression is enabled. This will be changed to debug
> > level later.
> >
> > The encoding is enabled by default, special option
> --x-no-mdr15-compression
> > can be used to turn it off.
> >
> > Note that the size of the *_mdr.img file will be smaller (which is esp.
> > intersting for those who get close to the 2G limit) Note also that a
> zipped
> > *_mdr.img can and will be larger since zip cannot remove as much
> > redundancy. Note also that this branch includes the changes from the
> > faster-mp branch and introduces a few changes which are relavant for
> > --lower-case maps.
> >
> > How to test?
> > Install the map in MapSource and check if you see any unexpected
> characters
> > in the result lists or maybe even crashes while searching. If so, please
> > try the same input files with the --x-no-mdr15-compression to verify if
> > this is caused by compression or maybe other changes.
> >
> > Please don't yet publish the maps, but let me know if you see anything
> > unexpected. Some changes reg. lower-case in this branch are still
> > experimental.
> >
> > The binary is here:
> > https://www.mkgmap.org.uk/download/mkgmap-mdr2-r4865.zip
> >
> > If you see errors which are caused by compression, please attach the
> > diagnostic output.
> >
> > @Ticker: Please review the source.
> >
> > Gerd
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev at lists.mkgmap.org.uk
> > https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
>
>
>
>
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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