We are in a process of developing tools for visualization of raster data, like a digital picture which is put together by many cells each containing a measurement value.
This is one of our visualization tools where you can compare datasets of for example CO2 flux or temperature. The datasets are provided by researchers. Choose dataset (service), variable and date and you will get a visualization of the combined data. The Gamma in this case represents the intesity of values in the image.
A prototype of an alternative visualization based on the THREDDS server is also available.