Export DF world map for use in GIS tools

[chdoc]

The goal of this plugin is to export the world map at the region-tile (i.e., embark tile or midmap-tile) level for use with GIS programs like ArcGIS or QGIS. For a medium-sized map, this amounts to (129*16)^2 = 4260096 region tiles with biome information for every region tile fetched from one of the surrounding world tiles.

In order to keep the output down to a manageable size (17 MB of CSV for a medium-sized world), region tiles are clustered by the world tile they take their information from, and every cluster is exported as a single feature with its geometry described as a WKT (MULTI)POLYGON, resulting in an export of only 129^2 = 16641 features.

• [ ] proper classification for site export
• [ ] documentation and change log