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MapDiff

MapDiff is a utility for visualising OpenStreetMap activity:

Each frame represents a daily diff, generated with Osmosis. Changes are displayed as three colours - red for deletion, blue for creation, and green for modification.

Usage

MapDiff is invoked with a base map, an input change set, and a location to save the output:

    $ mapdiff --map=Map.png --input=2008_01_01.osc --output=2008_01_01.png

The base map must follow the "Google Tile" scheme, i.e., a square mercator projection with a latitude extent of ±85.05112877980659.

The Resources/ directory contains a sample map that fits this size, along with scripts to automate the building of diff images and to convert them to a movie.

Building

MapDiff is written in D, and can be built with GDC.

Version History

  • mapdiff 1.0
    • Released 2008/03/06
    • Initial release