Polymaps provides speedy display of multi-zoom datasets over maps, and supports a variety of visual presentations for tiled vector data, in addition to the usual cartography from OpenStreetMap, CloudMade, Bing, and other providers of image-based web maps.
Because Polymaps can load data at a full range of scales, it’s ideal for showing information from country level on down to states, cities, neighborhoods, and individual streets. Because Polymaps uses SVG (Scalable Vector Graphics) to display information, you can use familiar, comfortable CSS rules to define the design of your data. And because Polymaps uses the well known spherical mercator tile format for its imagery and its data, publishing information is a snap.
The provided examples give a hint about the possibilities you have with Polymaps. Here are two elegant examples for maps based on custom tiles made with CloudMade:
The following example shows different ways to display data. The used tiles are served by another great piece of code by Stamen named TileStache:
This visualization shows the pavement quality of San Francisco streets, mashing up two datasets from DataSF. Streets with high pavement quality are shown in green, while those in the worst quality are red.