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I develop an Android app that uses Mapsforge to display OSM maps. I could use a pre-built map in the MapsForge file format but that makes my APK file to big and I only need a small part of my country anyway.

How can I only get a small rectangle part of the world of OSM and put it in a map file?

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3 Answers 3

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A ready-to-go solution can be the web service of http://extract.bbbike.org/, there you can define a boundingbox on an online map and choose many different output formats for OSM based maps. They also have mapsforge format there.

Have not tried on my own so far, so I cannot give any information about size limit for downloads, like a whole continent or similar

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I assume that you require the .OSM format.

Start by downloading the Planet.osm file, and use the program Osmconvert.

The command osmconvert planet-160104.osm -b=-144,20,-50,90 -o=subset.osm will subset to a square AOI as specified.

See more info here and specifically for subsetting the dataset here.

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  • I guess I could do it with the Argentina map also? Since I can't download 46GB.
    – juergen d
    Commented Jan 8, 2016 at 11:08
  • Yes, you could also use a Argentina.osm file, if you had that available.
    – Mikkel Lydholm Rasmussen
    Commented Jan 8, 2016 at 11:24
  • I think the Mapsforge file format is somewhat different than OSM: github.com/mapsforge/mapsforge/blob/master/docs/…
    – juergen d
    Commented Jan 8, 2016 at 13:38
  • @juergend - Then follow the guide here github.com/mapsforge/mapsforge/blob/master/docs/… and convert your subsetted .osm file into the Mapforge format.
    – Mikkel Lydholm Rasmussen
    Commented Jan 8, 2016 at 14:13
  • I used OSMosis to convert a OSM file to a Mapsforge MAP and did only take a part of the map in the process with: .\bin\osmosis.bat --rb c:\\argentina.osm.pbf --mw c:\\argentina.map bbox=-27.12881324,-55.20423889,-26.50621777,-54.56977844
    – juergen d
    Commented Jan 8, 2016 at 16:48
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You could try DogSheep Customizable Maps app. It lets you download maps by cutting it with a bounding box. The app uses MapsForge, so you could grab the map.map file from the download/dog_sheep/map_name directory, where map_name is the name you gave to the map when you downloaded it.

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