New answers tagged tiles
2
You could use an XYZ layer in Openlayers. This layer should be used in OpenLayers, whenever you have tiles arranged by a standard XYZ grid. This tileset format has been popularized by OSM & then Mapbox.
A Sample is presented here: http://openlayers.org/dev/examples/mapbox.html
For an OSM-like layer you should set the property sphericalMercator: true, ...
0
If the problem depends on the browser you use, it might well be a question of Same Origin Policy.
See http://romkey.com/2011/04/23/getting-around-same-origin-policy-in-web-browsers/
for some hints.
2
Mapnik itself is basically just a rendering engine. As I understand, it can be used to render anything from tiles, to 8.5"x11", and even plotter-sized PDFs. To describe it very simply, Mapnik takes your data inputs, a spatial boundary, and a set of symbology styles (either hard-coded or an XML source), then it renders the map (potentially just a simple tile) ...
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Sadly, no. Not in 2.0. 2.1 should provide significant performance improvement over 2.0.
No matter what you attempt in the database with 2.0, you are limited by the number of times the raster objects are serialized/deserialized.
PostGIS 2.1 should be going beta in the next week or two (hopefully sooner than later).
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