[mkgmap-dev] Problem with global index POI search

Sun Nov 14 17:04:05 GMT 2021

Hi Gerd

I notice that Mdr8, which is commented as having the same relationship
to Mdr7 as Mdr12 does to Mdr11, is commented out.

On my test area with 2 tiles and ~40k POI, Mdr12 has 4 records. 

Ticker

On Sun, 2021-11-14 at 16:21 +0000, Gerd Petermann wrote:
> Hi all,
> 
> I think I finally found what's wrong. MapSource doesn't like the
> Mdr12 index which contains a few pointers with the first 4 characters
> of a POI name. The funny thing is that MapSource works well when this
> section isn't written at all. Maybe it is slower but I found no
> difference. The attached patch changes only the content of the
> section. The code now works similar to that in PrefixIndex class so
> that strings are compared with the collator that is set to compare
> only primary strength.
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Sonntag, 14. November 2021 11:33
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Problem with global index POI search
> 
> Hi all,
> 
> my findings so far:
> I can also reproduce the problem with the default style for a
> complete map of Italy (geofabrik extract from 2021-06-23) using
> options
> java -jar mkgmap.jar  --preserve-element-order --bounds=bounds.zip  -
> -max-jobs --code-page=1252 --lower-case --add-pois-to-areas -c
> template.args
> Will try to find a much smaller set of files...
> 
> The uppercase.patch helps also in this case, so it is probably a good
> approach. Index size doesn't change with this patch, uppercase2.patch
> increases it.
> Have to analyse memory peak usage, though.
> @Ticker: I also tried various alternatives with
> Collator.setStrength() and similar but nothing fixed the search. I
> guess we really need a very small set of tiles with only a few
> strings to fully understand what's wrong.
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Samstag, 13. November 2021 11:16
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Problem with global index POI search
> 
> Hi,
> 
> this problem is possibly related to --lower-case.
> Both attached mini-patches seem to fix the problem (but may introduce
> others).
> No idea yet if this is the right way to tackle this problem.
> 
> Gerd
> 
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Gerd Petermann <GPetermann_muenchen at hotmail.com>
> Gesendet: Samstag, 13. November 2021 09:49
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: [mkgmap-dev] Problem with global index POI search
> 
> Hi devs,
> 
> Enrico has contacted me in a PM about a rendering problem with his
> maps and while analysing that I found an obvious bug searching for
> e.g.
> "Scuola Dell Infanzia Fondazione Pietro Caprettini" as name of the
> POI without filling any further fiels in MapSource.
> When I start to type that name MapSource updates the list of
> candidates.
> For scuo it shows the full name "Scuola Dell Infanzia Fondazione
> Pietro Caprettini" but when I select that entry with the mouse the
> search returns "no items found"
> When I type scuol the name "Scuola Dell Infanzia Fondazione Pietro
> Caprettini" disappears from the candidates list as well as all other
> names starting with "Scuola dell".
> My understanding is that we probably create wrong Mdr11 entries, but
> MdrCheck doesn't complain.
> 
> The tiles are at https://files.mkgmap.org.uk/detail/536
> The command to reproduce the problem:
> java -jar mkgmap.jar --code-page=1252 --index --gmapi  66923003.img 
> 66923005.img 66923006.img
> 
> The tiles were created with the --lower-case option and a rather
> special style which sometimes adds leading / trailing blanks to
> names. It also produces lots of equally named POI.
> 
> Gerd
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