> First, let me stipulate that I know IDV does many things Panoply doesn't, and > I use and proselytize it regularly. But lately i have run into a couple > discrepancies where Panoply can handle data through OPeNDAP that IDV > struggles with due to performance reasons. I wonder if there is anything you > can do to catch up... > > Case #1: MODIS Level 3 data in OPeNDAP, hyrax variety (please do not > advertise this URL, though, it is intended primarily for machine use by our > Giovanni app): > > http://disc1.gsfc.nasa.gov/opendap/Aqua_MODIS_Level3/MYD08_D3.051/2011/MYD08_D3.A2011001.051.2011005093254.pscs_000500527176.hdf > > This is a very large file with many, many variables. That said, Panoply > takes about 20-25 seconds to inventory the variables in the file, and another > 5-10 secs to display one. IDV takes ~6 minutes to inventory the data file on > a MacBook Pro, but then about the same time as Panoply to display one > variable. (BTW, this is actually a subset of the original MODIS L3 file, > which is even larger!) > I tried this url and it took about 15 seconds, so it really depends on the network traffic and loads of the server. > Case #2 Merged IR in OPeNDAP of the GrADS Data Server (GDS) variety: > http://disc2.nascom.nasa.gov:80/dods/MergedIR > > GDS presents the whole dataset as one huge "file". Panoply can display this > after a few minutes of churning; however IDV eventually errors out after > several minutes with a message about Java heap space. > > Case #2 would be more useful for us to get fixed--we had a user asking us how > to read the Merged IR through IDV. > > Anything you can do? My IDV has 4G memory, and it has no problem to load the data. So the solution for your user is to increase the memory. Yuan > -- > Dr. Christopher Lynnes NASA/GSFC, Code 610.2 phone: 301-614-5185 > > > Ticket Details =================== Ticket ID: FDK-698636 Department: Support IDV Priority: Normal Status: Open
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