NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Thanks for the reply Robb. I misunderstood how the query worked. I thought I could specify the variable and a height and a file would be created. I am new to this stuff, thanks for your help. If I need wind in the u and v directions at various heights (10, 20, 30, 40...1000m) is that possible? I guess I need to know what data is available with what product. Should I check the model descriptions for that information? Thanks again. # =================== Kyle Shannon Physical Science Technician RMRS Fire Sciences Lab Fire, Fuels & Smoke - RWU 4405 5775 Highway 10 W. Missoula, MT 59808 (406)646-6577 kshannon@xxxxxxxxx ksshannon@xxxxxxxxx # =================== On Mon, Nov 2, 2009 at 3:54 PM, Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>wrote: > On Mon, 2 Nov 2009, Kyle Shannon wrote: > > Hello everyone, >> I am trying to use the netCDF subset tools and I was wondering what values >> are >> acceptable for the 'vertCoord' >> variable. Can I specify height above ground level and set vertCoord to n >> meters above the ground? >> > > Hiya Kyle, > > I'm not quite sure I understand your question but the netCDF subset tool > can only return values that are in the file. For instance, if the file has 2 > meter height above ground level, you can not request 5 meters above ground. > > Here's a sample url DGEX_Alaska_12km grid > > > http://motherlode.ucar.edu:8081/thredds/ncss/grid/fmrc/NCEP/DGEX/Alaska_12km/files/DGEX_Alaska_12km_20091101_1200.grib2/dataset.html > > Looking at the page, you can see that the values that are acceptable are > the values next to variable Geopotential_height. > > with Vertical Levels (pressure) : 100000.0 85000.0 70000.0 50000.0 25000.0 > Pa > Geopotential_height > > Documentation about vertical coordinates says: > > For Grid as Point only , you may specify the vertical coordinate. The > vertical slice closest to the requested coordinate will be returned. The > possible vertical coordinates are shown in the Dataset Descriptor document. > If you specify multiple variables with different vertical coordinates, > ambiguous results are possible, and you are advised not to use the service > in this way. If you do, the following rules are used: > > 1. Variables are examined in order they appear in the query, and the > vertical coordinate for the first variable that has one is used. > 2. The service loops through the levels of that vertical coordinate, and > for each variable looks for the closest value (ignoring units!!) > 3. If the value is outside the range for that variable, a missing value > (NaN) is used. > > Example: > > * vertCoord=850 > > > For more information: > > http://www.unidata.ucar.edu/projects/THREDDS/tech/interfaceSpec/NetcdfSubsetService.html > > Robb... > > > > > >> # =================== >> Kyle Shannon >> Physical Science Technician >> RMRS Fire Sciences Lab >> Fire, Fuels & Smoke - RWU 4405 >> 5775 Highway 10 W. >> Missoula, MT 59808 >> (406)646-6577 >> kshannon@xxxxxxxxx >> ksshannon@xxxxxxxxx >> # =================== >> >> >> > > =============================================================================== > Robb Kambic Unidata Program Center > Software Engineer III Univ. Corp for Atmospheric > Research > rkambic@xxxxxxxxxxxxxxxx WWW: > http://www.unidata.ucar.edu/ > > ===============================================================================
thredds archives: