[mkgmap-dev] New User: Inconsistent results - help!

Thu May 14 20:09:35 BST 2020

Hi Andrew

I'm not sure why the .img file is a little bit different every time but that could be because of date/time stamps ?
You can rename the *.img file to whatever you like and copy it to your garmin SSD.
You can't do harm to your device or existing maps installed. I would say: just try it

Another option is creating an installer for basecamp or mapsource, then you can see the results on your pc before you copy it to your device. And another tip would be to use preprocessed bounds & sea files with the option --precomp-sea
You can download them from http://osm.thkukuk.de/data/ that makes it easier.

Hope it helps

Kind regards
Joris

-----Oorspronkelijk bericht-----
Van: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> Namens Andrew Morris
Verzonden: donderdag 14 mei 2020 20:36
Aan: mkgmap-dev at lists.mkgmap.org.uk
Onderwerp: [mkgmap-dev] New User: Inconsistent results - help!

(Sorry for the possible repeat, the previous message was sent from the wrong e-mail address)

Recently I updated my GPS unit and decided to also update my maps (2011).  After looking at Garmin's prices I decided to take a look at OSM, and things have come a long way since I looked last (2012?).

I did some reading and headed down the road.   Things seem to be 
working, but I'm getting inconsistent results - aka the gmapsupp.img file is not the same each time I create it.

(Note: My Java isn't the latest-greatest, but it should be sufficient for this process: java version "1.8.0_202")

Here's what I've done:

1) Downloaded the latest versions of mkgmap (r4486) and splitter (r597). 
  I also downloaded and compiled osmconvert and osmfilter.  I placed them in their own directory:

(I'm a sysadmin by trade, this is what I do...)

ls -l /opt/mkgmap/ /opt/mkgmap/lib/ /opt/mkgmap/bin/
/opt/mkgmap/:
-rw-rw-r-- 1 bin bin   17989 May  6 02:37 LICENCE
-rw-rw-r-- 1 bin bin    2784 May  6 02:37 README
drwxr-xr-x 2 bin bin    4096 May  7 13:58 bin
drwxrwxr-x 3 bin bin    4096 May  6 02:38 doc
drwxrwxr-x 6 bin bin    4096 May  6 02:37 examples
drwxrwxr-x 2 bin bin    4096 May  6 02:37 lib
-rw-rw-r-- 1 bin bin 2350418 May  6 02:37 mkgmap.jar
-rw-rw-r-- 1 bin bin  413879 Jan 30 07:11 splitter.jar

/opt/mkgmap/bin/:
-rwxr-xr-x 1 bin bin 182128 May  7 13:58 osmconvert -rwxr-xr-x 1 bin bin 100640 May  7 13:58 osmfilter

/opt/mkgmap/lib/:
-rw-rw-r-- 1 bin bin 475284 May  6 02:37 fastutil-6.5.15-mkg.1b.jar
-rw-rw-r-- 1 bin bin 132654 May  6 02:37 osmpbf-1.3.3.jar
-rw-rw-r-- 1 bin bin 533455 May  6 02:37 protobuf-java-2.5.0.jar
-rw-rw-r-- 1 bin bin 120069 Jan 30 07:11 xpp3-1.1.4c.jar

2) I downloaded an OSM extract from Geofabrik, and using splitter carved up my canada-latest.osm.pbf into pieces.  As per the wiki I used osmconvert and osmfilter to build the bounds data.  These steps are consistent and repeatable.  Here are the steps I've taken just in case they are consistently wrong...

osmconvert canada-latest.osm.pbf -o=canada-latest.o5m osmfilter canada-latest.o5m \
   --keep-nodes= \
   --keep-ways-relations="boundary=administrative =postal_code postal_code=" \
   -o=canada-latest-boundries.o5m

mkdir bounds
java -cp /opt/mkgmap/mkgmap.jar \
      uk.me.parabola.mkgmap.reader.osm.boundary.BoundaryPreprocessor \
      canada-latest-boundries.o5m bounds

mkdir work
( cd work ; java -jar /opt/mkgmap/splitter.jar ../canada-latest.osm.pbf )

The final step (afaik) is to combine the split files and the bounds information into a single gmapsupp.img file.

( cd work ; java -jar /opt/mkgmap/mkgmap.jar \
                  --route --add-pois-to-areas --bounds=../bounds \
                  --series-name='Canada OSM 2020' \
                  --family-name='Canada OSM 2020' \
                  --area-name='Canada OSM 2020' \
                  --country-name='Canada' --country-abbr='CA' \
                  --description='OpenStreetMap data for Garmin (2020)' \
                  --index --gmapsupp 6324*.osm.pbf )

This always runs to completion with MapFailedExceptions and ExitExceptions returning 0.  Approximate time 19 minutes (4 core, 32G).

I am assuming that the series-name, family-name, etc are just different tags used by different Garmin units.  I haven't tried uploading it to my 
GPS unit yet as I'm concerned about the inconsistencies.   Here are the 
results from multiple runs (osm/bounds/split data is all identical):

1260027904 May 7 16:54 gmapsupp.img
1260027904 May 7 17:18 gmapsupp2.img
1259929600 May 14 10:49 gmapsupp3.img
1259929600 May 14 11:44 gmapsupp4.img

md5sum -b *.img
34053990aecc68a257e95115b2bb3f45 *gmapsupp.img
91e3d3e9f0012672da65dead8c752dd9 *gmapsupp2.img
821234ad26e17d0135bf613cf9faf161 *gmapsupp3.img
abf39cef1430c4cbd74795fa11b571b8 *gmapsupp4.img

Is this normal?  If so why?

Thank you for any help you can provide!
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