I'm using QGIS to make maps of the maize, rice and wheat cultivated area at global level. I found these great netCDF files: http://www.geog.mcgill.ca/landuse/pub/Data/175crops2000/NetCDF/
Here's an example of the maps that they can generate: Maps
I have loaded the maize, rice and wheat files as layers in QGIS, and get a rainbow of colors. Problem is, I have no idea what they mean. According to the legend on the map above, the color scale indicates "% of total area"; the same datasets were used - I think - for this map, where the legend indicates "Cassava area (Percent cropland)".
Both those legends are bit cryptic (and the colors I get in QGIS are around 40). So I'm trying to locate where in QGIS I can find the "official" legend and descriptions of what the colors indicate. I followed the steps here and the legend I got was just the names of the three layers, with no colors. If I try just one layer, I get the name of the layer and nothing else.