[mkgmap-dev] PATCH reduce index size

Sun Dec 5 15:35:37 GMT 2021

ah okay - too bad the entry itself cannot be removed completely.

On Sun, 5 Dec 2021 at 16:32, Gerd Petermann <gpetermann_muenchen at hotmail.com>
wrote:

> Hi Felix,
>
> yes, I think it works as documented. Those entries can come from labels
> which start with M0. , so it's not an additional entry produced by the
> --split-name-index option. I also tried to remove the full entry but then
> the search didn't work any more.
>
> Check what happens when you remove the clause "st.getNameOffset() > 0 && "
> .
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Sonntag, 5. Dezember 2021 15:57
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] PATCH reduce index size
>
> 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<mailto: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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>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
>
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>

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