I don't think it would help. I need to see the evolution of the quantity through the years, so I loaded a shp file for each year. If I name the column simply Qty instead of Qty2013, how can I understand that regions coloured are according to qty2013 instead of qty2014? At the moment I'm forced to have 3 separate shp file, but I'm trying to obtain at least 1 sld file

all France at the moment, but then I will need to analyze the whole world as I said...

did you use this same plugin to resolve your issue? that's my piece of code about the layer: function layerGeoserver(lName, opac){ var lay = L.tileLayer.betterWms("http://" + ip + ":" + geoserverPort + "/geoserver/" + geoserverWorkspace + "/wms", { version: wmsVersion, layers: geoserverWorkspace + ':' + lName, format: 'image/png', transparent: true, attribution: layersAttrib, });

Really helpful answer! I just noticed that in the Geoserver layer preview there is the option "Tiled" or "Single Tile" and if I choose the former I get the same "mistake" where the latter allows me to see everything in terms of labels and pie charts. I'm giving a look to the link you suggested me...thank you @Djana