Hi Fan, I took a look on your file and it looks like the time dimension definition is causing some confusion. It declares the time axis as the lon axis: double time(time) ; time:units = "days since 2000-01-01" ; time:_CoordinateAxisType = "Lon" ; time:axis = "T" ; time:bounds = "time_bnds" ; time:calendar = "standard" ; time:long_name = "time" ; time:standard_name = "time" ; The attribute time:_CoordinateAxisType has to be time:_CoordinateAxisType = "Time" ; If you don't have control on how the file is written you can override the attribute using ncml: <?xml version="1.0" encoding="UTF-8"?> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2" location="./ta_AIRS.2002.09.01.L3.RetStd030.v5.0.14.0.G07283162057.hdf.nc"> <variable name="time"> <attribute name="_CoordinateAxisType" value="Time"/> </variable> </netcdf> Cheers! Ticket Details =================== Ticket ID: YXL-373395 Department: Support THREDDS Priority: Normal Status: Open