Vector map rendering

Kothic

Workflow

1. load OSM data - plain *.osm XML files only at the moment
2. generate vtiles - basically tiled textfiles
3. render from vtiles - only Cairo supported at the moment

Issues

Vtile generation doesn't scale

For example, for processing the Czech Republic data (state 16.10.2012) requires about 9.5 GB of RAM. It also just runns in a single thread.

There are two possible solutions for the RAM issue:

• iterate more times over the data
• use on disk cache/database for the temporary results
  • this is what ​the old OJWs tile data server does during import