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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hi Jay- Please send these questions to support-idv instead of me. That way you'll be sure to get a timely response by someone here in case I'm out of the office. > Becky and I made some MSG eumetcast images into netCDF files with our > new CF=YES keyword in IMGCOPY (which makes CF compliant netCDF files). Well, since there isn't a standard for images yet, I guess they are CF compliant grids. ;-) > When we display them in -V and the IDV the time and date are wrong. The > day/times seem to be in the netCDF file header correctly. Can you check > these files and let us know what you think? > > ftp://ftp.ssec.wisc.edu/pub/mug/eumetcast/ > > File:MSG-12UM0003.nc - 600x600 centered at lat/lon 0,0 (4 MB) CF > compliant (CF=YES) > File:MSG-12UM0004.nc - 600x600 centered at lat/lon 0.0 (4 MB) old format > (CF=NO) There is no value given for the time variable. ncdump shows it as missing, so it's probably a NaN in the IDV which would be a large negative number. time = _ ; Since your units are seconds since the epoch, that will give you something back in early 20th century. A couple more notes. Your time variable is listed as: int time(time) ; time:long_name = "seconds since 1970-1-1 0:0:0" ; time:units = "seconds since 1970-1-1 0:0:0" ; The long name should probably be "nominal image time" and the units should ideally have the leading zeros: seconds since 1970-01-01 00:00:00 It works as is, but is much more exact as I have it. Also, if you want them to be CF compliant, you'll need to have the global attribute: :Conventions = "CF-1.0" ; It would be helpful to have some other global attributes like: :nominal_image_time = "1998-06-30 00:15:00Z" ; :history = "netCDF encoded on 2008-09-13 22:21:05Z" ; to help with the readbility. It might also be a good place to put the audit trail. > To view them in -V or the IDV I use the General - Files/Directories > chooser and use "I'm Feeling Lucky" to make a Color-Shaded Plan View. > The actual time on the image is 0Z on day 2009042. -V and the IDV lists > the date as 1901-12-13 at 20:45:53Z. That would be the way to load them in, but the time needs to be fixed first. Ticket Details =================== Ticket ID: RNL-400249 Department: Support IDV Priority: Normal Status: Open