Auto selection of Map file depending on location

[John Rellis]

Hey,

If I have a number of maps downloaded onto my android device is there any way to select the correct map file for my current location?

Right now I have a setting that lets the user select Ireland.map or California.map, it would be great if there was some way to do this automatically.

Do the map files store any meta data that is accessible to allow me to do this?  Like bounding lat/longs or something like that??

Many thanks,

John

[Thilo Mühlberg]

Hi John,

aach map file contains some meta data about its content. See
SpecificationBinaryMapFile [1] for the low level details.

The MapView.getMapDatabase() method returns a MapDatabase for the
current map file. If you call MapDatabase.getMapFileInfo() you have an
object which contains all available meta data for the map file. [2]

Automatically switching between different map files based on your
location or the displayed map on the screen is not (yet) possible.

Best regards,
Thilo

[1] https://code.google.com/p/mapsforge/wiki/SpecificationBinaryMapFile
[2] This explanation is for version 0.3.0 of the mapsforge-map library.

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[Neil Boyd]

The map header contains the bounding box, but not the bounding
polygon.

There's no space in the header for storing arbitrary data, so you
can't just put it into the header.

I also want to do the same thing as you, but the only way I found was
to know the polygons from some other way than reading the map file.

Neil

[John Rellis]

Thanks for the responses. If I can get at the bounding box maybe I can get something to work!

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