use geojson and simplestyle features rendered with mapnik
npm install tilelive-overlay
Add GeoJSON features with simplestyle styles in a tilelive pipeline.
npm install --save tilelive-overlay
* overlaydata://GEOJSONSTRING
* overlaydata://2x:GEOJSONSTRING (retina)
Provides a overlaydata://GEOJSONSTRING scheme for tilelive,
which transforms GeoJSON into a Mapnik stylesheet
using geojson-mapnikify, and then provides
raster tiles of it.