I am downloading data of http://www.earthstat.org/harvested-area-yield-175-crops/#ind-crops, which gives me the harvest area of different crops around all the world.
Once I downloaded the data for one crop, I have two files, one IrfanView TIFF File and one XML file. To import the IrfanView TIFF File to QGIS I do "Layer", "Add Layer" and "Add Raster Layer". I obtain a map scaling by colors. I try to get the data from the Attribute Table but there is no attribute table, so I am not sure how I should procedure to get/obtain the data to use it.
On the other hand, to import the XML file, I downloaded the Plugging LandXML and when I import the file it says
Python error : An error has occurred while executing Python code: See message log (Python Error) for more details.
I am new in QGIS.so How can I obtain the information of the files to use (maybe transforming the tif file in a shp file? I have just searched online how to import them. Should I mix both files? Are they complementaries? Am I importing them wrong?
According to the web page, the dataset contains a map of spatial resolution five minute by five minute, 4320x2160 cell grid, the spatial reference is GCS_WGS_1984, the cell size is 0.083333 degrees, etc. And one of the main data is the average fractional proportion of a gridcell that was harvested in a crop during the 1997-2003 era. However, I am not able to get the data with that two files.
I attach a image of the type of files I have: