This page shows the tags distribution over geographical area
For each month, from August 2008 to March 2012 the 3000 most popular question were obtained. For each question, the geographical location of the owner user was extracted. The raw textual location was then converted to geographical coordinates using Google Maps Geocoding API. The location was then associated to the tags on the question.
The results are represented in a geographical map with a clustered overlay using the Google Maps API with the MarkerCluster extension. The markers color and number represent how many questions with a specific tag are present in that area
Click on a tag:

Showing locations for: php