I am developing a mobile app for which an offline map is required. Is it possible to have such map within few 10s of MBs? The requirement is to have:

  1. Map with smaller zoom size; e.g. In this URL of Google Maps, the z denotes the zoom size (following longitude, latitude): https://www.google.co.in/maps/@12.9677753,77.6490654,15z; Hence 15 Google Map equivalent zoom size is manageable, I am ok with 14 as well if it reduces the size considerably
  2. The map can be a big image file with names of the street etc. printed
  3. The map should cover at least a country as big as US/Canada (if not the whole world)

Google maps doesn't seem to help. I also tried OpenStreetMap and its various links but what I found was the map size of 30-40 GB. I referred following question as well, but unable to get answer:
Offline Map Service with Mapnik and Leaflet

From where can I download such small size map or what is the minimal size of map which has bare minimal street view (not sure if this link can help)?


There is no way you can get the map that small and still be readable like at that zoomlevel.

Just consider this:

  • the scalebar on gmaps (bottom right corner) is roughly 1", so even at z14: 1 km = 1 inch
  • an imaginary country with 1000km*1000km, so a map of that country would take 1000"x1000" (1000000)
  • you want it colored, so at least 8bit, i.e. *8
  • you want to identify objects within that 1km (=1"), so you can't use 1dpi .. let's take 50dpi, so *50

now we are at 1000000 * 8 * 50 =~ 50MB

what do we get for our 50MB?

  • 256 colors (might be enough for a street-map)
  • 50dpi, which isn't close to readable
  • a 1000*1000km country (as comparison: canada is ~5500km*4500km)
  • +1 thanks. Is it possible at least to download all the co-ordinates against the addresses in the world or a given country in simple text format. Using Google API, it takes too much of time. e.g., if we run Google API then 1 big city is covered in 3 hours, with .001 precision. (i.e. AB.XYZ, AB.XYZ format); This is too slow and I believe all these data should be stored somewhere ready made for quick download. – iammilind Mar 6 '15 at 10:41
  • Both, detailed Map-/Sat-Images and georeferenced Adresslists are a big Business. I don't think there is a way to get them (legally) for free. – ymirsson Mar 6 '15 at 11:17
  • Is it not possible through the free sites like OpenStreetMap or blueblackworks? I tried their FTP server, but couldn't find it in a downloadable way. – iammilind Mar 6 '15 at 12:02
  • You can download a full copy of the OSM Database here and extract all building nodes ... but OSM is nowhere near complete. As example: in Austria are roughly 2.7M registered buildings (i.e.: with street/houseno.). According to the latest Analysis OSM contains about 600k of them. So just 1/4 in a - more or less - high active area. – ymirsson Mar 6 '15 at 12:32

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