[mkgmap-dev] PATCH reduce index size

Sun Dec 5 14:57:28 GMT 2021

are you sure this works fully?
I still have some strings in the display.jar output.
I updated the gmapsupp.img here: https://openmtbmap.org/gmapsupp.img

The log file from display.jar decreased by around 15% in size - but there
are still entries like:
00036727 | 00300e | 4d 30 2e 20             | [1082] str: M0.
0003672b | 003012 | eb 28                   | Index?  10475
0003672d | 003014 | 4d 31 2e 20             | [1083] str: M1.
00036731 | 003018 | ec 28                   | Index?  10476
00036733 | 00301a | 4d 32 2e 20             | [1084] str: M2.
00036737 | 00301e | ed 28                   | Index?  10477
00036739 | 003020 | 4d 33 2e 20             | [1085] str: M3.
0003673d | 003024 | ee 28                   | Index?  10478
0003673f | 003026 | 4d 34 2e 20             | [1086] str: M4.

Another thing which could be optimized - no number only entries. I don*t
know any country where you would have an address with the street consisting
of numbers only. Maybe this should be optional with another switch?
I know addresses without a street name at all - it*s just name of the place
plus a number. But I do not know streets with only number as name. Maybe
some countries have that? Most definitely do no.
Even one letter and numbers is a bit strange. I think most streets have ref
and name (e.g. B11 myname) - not sure if some searches for say B11
housenumber instead of myname housenumber. Maybe they would search for B11
myname housenumber.

On Sun, 5 Dec 2021 at 11:24, Gerd Petermann <GPetermann_muenchen at hotmail.com>
wrote:

> Hi all,
>
> as a result of the discussion with Felix in this thread
> https://www.mkgmap.org.uk/pipermail/mkgmap-dev/2021q4/033394.html
> I've created a rather small patch to change the meaning of the --mdr7-del
> option.
>
> With this patch the option has one more effect:
> If --split-name-idex is in use, any additional entry produced by that
> option which starts with a string that appears in the given list is
> skipped.
>
> I think this is probably wanted by all users and it should not cause
> trouble with existing scripts.
>
> For Felix sample with a single tile the PC index size decreases from
> 449.536 bytes to 409.600,
> index in gmapsupp it's about 31kb bytes smaller.
>
> With the default style the change should be much smaller.
>
> Gerd
>
>
>
> _______________________________________________
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> mkgmap-dev at lists.mkgmap.org.uk
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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
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