&operation=netcdf3 &var=Latitude,Longitude,Optical_Depth_Land_And_Ocean &file=/data/modis/MOD04_L2.A2015021.0020.051.NRT.hdf &file=/data/modis/MOD04_L2.A2015021.0025.051.NRT.hdf &file=/data/modis/MOD04_L2.A2015021.0030.051.NRT.hdf