Rich- I am belatedly getting around to this issue. I built a local dataset of the form: Dataset { Float32 eta[time = 2816][ny = 251][nx = 131]; } testStandardTdsScan/lmf.nc; To test the problem in a simpler setting, and the query http://localhost:8080/thredds/dodsC/testStandardTdsScan/lmf.nc.dods?eta[1019][80][35] worked. So, I am assume that I am going to need the original .nc file Lake_Michigan_Forecast_Collection_3D_best.ncd Can you put it somewhere where I can download it? =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: WSO-347281 Department: Support THREDDS Priority: Normal Status: Closed