Land use classes map of Catania in GeoJSON format. This data comes from Sicily Region as a shapefile of the entire region with CRS Gauss-Boaga "Monte Mario Italy Zone 2" EPSG:3004.
I stripped the unnecessary information about other cities, then reprojected and converted in geojson format the data.
The source file is disposable at http://tinyurl.com/khxrx35
You could check the github documentation for using the GeoJSON object in your Javascript application.
A working example is visible on the github webpage of this project. It is provided with a leafletjs implementation and Bootstrap/jQuery. The colors and legends correspond to the official specifications. The code of this example could be accessed by gh-pages branch.