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I'm looking for implementations of spatial tag clouds or "tag maps". Some papers I found talk about a Yahoo Tag Maps API, but I couldn't find any such thing.

I'd prefer OpenLayers-based solutions, but others would be interesting too.

Edit: Example images can be found at, e.g:

alt text

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could you post an example/link of such a map? – radek Dec 13 '10 at 14:05
@radek: Thanks, I updated the question. – underdark Dec 13 '10 at 15:51
One of the guys here at Esri Australia created one for geotagging #tags on twitter. Unfortunately was a WPF app which only ran on the desktop. I could ask him to put it out – CDBrown Dec 16 '10 at 8:38
@CDBrown: Thanks, that would be great! – underdark Dec 16 '10 at 9:49

The key paper describing this work is Interactive Tag Maps and Tag Clouds for the Multiscale Exploration of Large Spatio-temporal Datasets, by: Aidan Slingsby, Jason Dykes, Jo Wood, Keith Clarke, In IV '07: Proceedings of the 11th International Conference Information Visualization (2007), pp. 497-504. doi:10.1109/IV.2007.71 However I can't find a reference to the actual tag-map applet they used in the paper (and I think I pointed that out when I reviewed the paper, so much for peer-review).

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Thanks iant, that's the paper mentioning Yahoo Tag Maps API if I'm not mistaken. Reference #11 should have linked to the Yahoo developer page of the API, but it doesn't exist (any more?). – underdark Dec 14 '10 at 17:16
Looks like it is now closed ( – iant Dec 14 '10 at 18:28

working example

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Thanks Mapperz, but these don't look quite right ... I'd expect differently sized labels depending on how many same-tagged features are found in close proximity. – underdark Dec 13 '10 at 21:09

Some of the things we talk about in HEALTH GeoJunction: place-time-concept browsing of health publications could be relevant. We didn't put the tags on the map but we do discuss how to build a tag cloud with spatial aspects.

The actual app is at (but you will need flash enabled).

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I keep getting a 'No data returned' error in the flash app. – underdark Dec 16 '10 at 9:42
Sorry about that the database password had expired which took some tracking down. – iant Dec 16 '10 at 20:50

This is Yahoo's Flash-based solution:

Too bad, the API link is broken.

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