(last updated July 2013)
- Should I create separate layers for labels and then for the features (roadways, buildings, etc) themselves ?
Yes. If you’re intending to display text of any feature (like the name of a building or road), create a separate layer for them. You can name it as ‘labels’ or whatever you’d like. Labels are not yet automatically set to render on top of every other feature (<a href=”https://github.com/mapnik/mapnik/issues/87>) layer so the text will not display as you intend in some instances (Dane Springmayer gave me a much more detailed explanation at State of the Map-US 2012).
Should each feature (roadways) have a separate layer ?
Do you have different layers for each zoom level ?
It’s common practice to have separate layers for highways based on different zoom levels.
Wnat data sources should I use ? Is there an advantage to use SHPs over PostGIS Databases ? GeoJSON instead of sqlite ?
I haven’t found any Tilemill stylesheets that extensively use layers from postgis besides osm-bright and am curious to see what others do.
- Other Tips:
Remember to ask yourself at each particular zoom level, what do I specifically want to show at this zoom level ?
– (J. Lord – State of the Map, US 2012)
Debugging, or why is my code or Tilemill, not working ?!
– Normally, Tilemill will point out a specific error in your Carto if it’s not formatted correctly.
If you want to see some carto in action, of howto write, manage your stylesheets, here’s a couple that I admire,
Osm-bright – Made by Mapbox.
Uses Postgis layers as their data sources;