Programming GPS and OpenStreetMap Applications with Java

7.7. Processing Maps with Osmosis 89

Coverage Zipped Unzipped Ratio Unzip Rezip Ratio

Germany 1,207 MB 14,875 MB 8% 2 h 30 min 5 h 09 min 200%

RGB-NW 480 KB 5,950 MB 8% 5 min 10 min 200%

Table 7.2. Uncompressing and recompressing OSM deliveries. (Hardware: dual

core CPU 1.67 GHz, 4 GB RAM, Win32 OS.)

to the source. When using different tools (or even one tool) unzipping and

rezipping a file most likely does not produce the identical byte size.

The benchmarks for the Germany map indicate that it takes almost four

hours to download the map and unpack it. For the single RGB-NW project

this is a lot of pre-processing. In a larger context, it might be worth ...