Hi,
another example is Kothic JS (http://kothic.org/js/), an open source
HTML5 canvas renderer based on Leaflet using GeoJSON-like vector tiles [1].
An OpenLayers example using GeoJSON vector tiles in addition to a raster
map is the Mapnik MetaWriter [2] demo:
http://r2d2.stefanm.com/mapnik/demo.html
The tile loading is done by a custom (?) Strategy.Grid class. This class
can also be used, for example, in conjunction with TileStache [3] for
serving vector tiles, but there are still some challenges, like how to
best handle features spanning multiple tiles and feature simplification
when zooming out.
Regards,
Norbert
[1] https://github.com/kothic/kothic-js/wiki/Tiles-format
[2] http://trac.mapnik.org/wiki/MetaWriter
[3] http://tilestache.org/
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