No problem Chris - you have a great weekend too! Sean > Thank you so much! You've been a ton of help! I will check out the OPeNDAP > classes/methods in netCDF this weekend. Sounds like the best way to go. > > Have a great weekend! > > Chris > > > -----Original Message----- > From: Unidata netCDF Java Support [mailto:address@hidden > Sent: Friday, May 22, 2015 2:41 PM > To: Chris Delaney > Subject: [netCDFJava #YYY-811129]: GridDataset Issues > > Hi Chris, > > I think this is the url you want to use in the Dataset.open call: > > http://nomads.ncep.noaa.gov:9090/dods/wave/mww3/20150522/multi_1.glo_30mext20150522_00z > > Cheers! > > Sean > > > Hi Sean - > > > > Here is the OpenDAP address: > > > > http://nomads.ncep.noaa.gov/dods-alt/wave/mww3 > > > > Thanks again for the help! > > > > Chris > > > > > > -----Original Message----- > > From: Unidata netCDF Java Support > > [mailto:address@hidden > > Sent: Friday, May 22, 2015 1:19 PM > > To: Chris Delaney > > Subject: [netCDFJava #YYY-811129]: GridDataset Issues > > > > Hi Chris, > > > > The netCDF-Java API has an Dataset.open() method that takes an input stream. > > > > If you know the array indicies you want to subset with, OPeNDAP will allow > > you to do so. Can you send me a link to the catalog on the NOMADS TDS that > > has the dataset you are looking for? The bonus of going through OPeNDAP is > > that you can pass the url directly into the open method and you're done. > > > > Cheers! > > > > Sean > > > > > Hi Sean - > > > > > > Thanks for the rapid response! > > > > > > I have little familiarity with OPeNDAP, as I am also just learning > > > netCDF. The reason I was going with the current method was because I am > > > able to query by a subset of lat and lon and therefore greatly reduce the > > > size of the grib file. This might also be an option with OPeNDAP and yes > > > the dataset I'm interested in is available on the url you provided. > > > > > > If I need to go with the inputstream approach does the netCDF API have a > > > method for this? > > > > > > Thanks! > > > Chris > > > > > > > > > -----Original Message----- > > > From: Unidata netCDF Java Support > > > [mailto:address@hidden > > > Sent: Friday, May 22, 2015 12:58 PM > > > To: Chris Delaney > > > Subject: [netCDFJava #YYY-811129]: GridDataset Issues > > > > > > Greetings Chris, > > > > > > GridDataset.open won't work in this case, as you are requesting a stream > > > of data back from the server over the http protocol, which means you need > > > to make an actual HTTP request for it. That said, you might be able to > > > use some http client code to make the request and read the result as an > > > inputstream, and then read that into netCDF-Java. I've not tried that > > > exactly, so I am not sure how well it would work. Also, going this route > > > would mean that your dataset would need to fit into memory. > > > However, if the data exist on the NOMADS THREDDS Data Server (TDS), then > > > it would be easier to read the data into netCDF-Java using the OPeNDAP > > > url: > > > > > > http://nomads.ncdc.noaa.gov/thredds/catalog.html > > > > > > Is you dataset available on their TDS? > > > > > > Cheers, > > > > > > Sean > > > > > > > Hello - > > > > > > > > I am trying to access a grib2 file from NOMADS website using the > > > > GridDataset.open() method. If I download the grib dataset into my > > > > resources folder then everything works OK, but if I try to use the > > > > command to open the file directly from the internet I receive and error. > > > > > > > > The URL for the grib2 dataset is: > > > > > > > > > > > > String filename = > > > > "http://nomads.ncep.noaa.gov/cgi-bin/filter_wave_multi.pl?file=multi_1.glo_30mext.t00z.f000.grib2&lev_surface=on&all_var=on&leftlon=235&rightlon=235&toplat=38&bottomlat=38&dir=%2Fmulti_1.20150522"; > > > > > > > > > > > > I then execute the following method: > > > > > > > > GridDataset.open(filename) > > > > > > > > And receive the following error: > > > > > > > > java.io.IOException: Server does not support Content-Length > > > > > > > > It seems strange that I can open the file from my resources folder in > > > > my java project but I can't access it directly from the internet. > > > > Anyhow any assistance would be appreciated. > > > > > > > > Thanks, > > > > Chris > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > Chris J. Delaney, P.E. > > > > Agency Engineer - Water Resources Planning Sonoma County Water > > > > Agency > > > > 404 Aviation Blvd > > > > Santa Rosa, CA 95403 > > > > Phone: 707-547-1946 > > > > address@hidden > > > > > > > > > > > > > > > > > > Ticket Details > > > =================== > > > Ticket ID: YYY-811129 > > > Department: Support netCDF Java > > > Priority: Normal > > > Status: Open > > > > > > > > > > > > Ticket Details > > =================== > > Ticket ID: YYY-811129 > > Department: Support netCDF Java > > Priority: Normal > > Status: Open > > > > > > > Ticket Details > =================== > Ticket ID: YYY-811129 > Department: Support netCDF Java > Priority: Normal > Status: Open > > Ticket Details =================== Ticket ID: YYY-811129 Department: Support netCDF Java Priority: Normal Status: Open
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