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[mkgmap-dev] splitter, mapid

From Thorsten Kukuk kukuk at suse.de on Mon Dec 17 08:21:24 GMT 2018


On Mon, Dec 17, Gerd Petermann wrote:

> Hi all,
> I've never tried it, but my understanding was that you can have the same tile (mapid) in two different gmapsupp files.
> E.g. you might create a tile containing an area around Hamburg and put that tile into a gmapsupp for Germany as well as another
> one for Lower Saxony.
> If that is right it would explain why you have to make sure that the content of two tiles with the same id doesn't differ.

Correct, this works, but only if the tile is 100% identical for both maps.
Or in other words: create a big map and select tiles from this map to build smaller
maps. So the same as if you select tiles in mapsource from a bigger map and transfer
them to the GPS device.


> @Brad: I think the current documentation about the meaning of all those names and ids is not perfect because the authors of mkgmap
> were still learning when the docu was created, and it's an ongoing process ;-)
> Feel free to improve the docu (post a patch or maybe a new version of one or more files).
> Gerd
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von brad <bradhaack at fastmail.com>
> Gesendet: Montag, 17. Dezember 2018 01:47
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: [mkgmap-dev] splitter, mapid
> One thing I think I missed, is that each tile on a garmin device needs a
> unique mapid.   A different family-id and mapname for each gmap is not
> sufficient.   Does this sound correct?
> I'd been downloading US states from Geofabrik, creating maps with unique
> family-id, mapname, every name & id that seemed important, (with
> mkgmap)  but when I put them on the Garmin they all wouldn't show up.
> Only when I went back to the splitter step & used a different mapid did
> they all show up.
> Sometimes I'm not too good at reading directions,  did I overlook this
> someplace?
> Brad
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Thorsten Kukuk, Distinguished Engineer, Senior Architect SLES & MicroOS
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nuernberg, Germany
GF: Felix Imendoerffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nuernberg)

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