Google Maps Downloader

Purpose

Google Maps Downloader can be used to download tiles from Google Maps service and glue them into one big image file

Installation

This is alpha, there is no gem installer. But you can play with it using git clone

git clone git://github.com/frantic/goo-maps.git
cd goo-maps/
bundle install
rspec --color --f doc spec

If you want to try it in action, go ahead!

cd bin/
chmode +x grab-goo-maps.rb
./grab-goo-maps.rb 3 /var/temp/

Requiriments

goo-maps library uses rspec to test-drive things, out-of-the-box Net:HTTP to download tiles and mini_magick to glue that tiles into one big image. For command-line interface (CLI) it uses ruby-progressbar - its very helpful, because "gluing" process is pretty time-consuming

CLI commands

There is only one simple command

./bin/grab-goo-maps.rb <zoom_level> <directory>

It is supposed to download all tiles by zoom level, store them into directory and glue in one big !map.jpg file. Tiles count depends on zoom level, formulas:

• Big image width and heigh (in tiles): N = 2^Z
• Image area (in tiles): T = N²
• Total required tiles (for sattelite and labels surfaces): K = T * 2

So after a while you'll get K tiles in directory

It supports HTTP proxy servers, just set $http_proxy environment variable