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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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To learn about what's going on, see About the Archive Site.
This aggregation is nothing more than a TDS software aggregation of the narrmon-a_221_* files. The Vegetation Type parameter is a static fixed field: http://nomads.ncdc.noaa.gov/thredds/catalog/narr/catalog.html?dataset=narr/AWIP32-fixed.grb I do not know why it would even appear in the narrmon-a files. ALL fields in the narrmon fields and files are averages of the <days_in_month>*8 fields in that month. Even for fields where avg() doesn't make sense, such as precipitation rate or anything with time in the denominator of the unit - which are typically more useful as a sum() statistical operation. -Dan On Tue, Nov 15, 2011 at 2:08 PM, Glenn Rutledge <glenn.rutledge@xxxxxxxx>wrote: > Hello Cedric, > Myself or one of the NOMADS Team will reply to your questions soon- were > looking into it. > Glenn- @ NOMADS > > On Thu, Nov 10, 2011 at 12:00 PM, Cédric David < > cedric.david@xxxxxxxxxxxxxxx> wrote: > >> Dear THREDDS user group,**** >> >> I’m unsure whether or not this is the right place to send these >> questions. If not, I’d love some advice on who to direct them to.**** >> >> I’ve been getting North American Regional Reanalysis (NARR) data from >> http://nomads.ncdc.noaa.gov/thredds/narr.html using the netCDFSubset >> tool. I am running some analysis on these netCDF files with focus on >> Precipitation, Evaporation, Runoff, Vegetation and Surface Air >> Temperature. I have therefore downloaded the following variables:**** >> >> **· **Evaporation (time, y, x)**** >> >> **· **Subsurface_runoff_baseflow (time, y, x) **** >> >> **· **Surface_runoff_non-infiltrating (time, y, x) **** >> >> **· **Total_precipitation (time, y, x)**** >> >> **· **Vegetation (time1, y, x)**** >> >> **· **Temperature_height_above_ground (time1, >> height_above_ground, y, x)**** >> >> ** ** >> >> I’m interested in a 20-year average of these fields (from 1980-01-01-0000 >> to 2000-12-31-2100) so I figured I’d use the “NARR-A Monthly Complete PoR >> Aggregation” and download monthly averages in one unique file which I’d >> then use to compute a 20-year average. The process ran fine but I’m >> curious about the netCDF file that I was able to download. The first four >> variables (Evaporation, Subsurface_runoff_baseflow, >> Surface_runoff_non-infiltrating and Total_precipitation) indeed have >> several monthly grids. However the last two variables (Vegetation and >> Temperature_height_above_ground) only have one unique grid each. **** >> >> ** ** >> >> So I downloaded several 3-hourly NARR-A files from the NetcdfSubset tool >> that I picked randomly from the entire dataset:**** >> >> **· **narr-a_221_19790101_0000_000.grb.nc **** >> >> **· **narr-a_221_19800101_0000_000.grb.nc**** >> >> **· **narr-a_221_20001231_2100_000.grb.nc**** >> >> **· **narr-a_221_20100101_0000_000.grb.nc**** >> >> **· **narr-a_221_20111031_2100_000.grb.nc**** >> >> ** ** >> >> I realized that the Vegetation variable had the same exact grid for all >> these files. So it makes sense to only have one grid in the aggregation . >> However, the Temperature_height_above_ground grid varies with time.**** >> >> ** ** >> >> So here are my two questions:**** >> >> **1) **Is the NARR Vegetation variable static?**** >> >> **2) **How is the Temperature_height_above_ground grid in the >> NARR-A Monthly Complete PoR Aggregation computed?**** >> >> ** ** >> >> Any help and advice would be greatly appreciated!!!**** >> >> Many thanks,**** >> >> Cedric **** >> >> _______________________________________________ >> thredds mailing list >> thredds@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/mailing_lists/ >> > > > _______________________________________________ > thredds mailing list > thredds@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > -- ======================================= Dan Swank STG, Incorporated - Government Contractor NCDC-NOMADS Project: Software & Data Management Data Access Branch National Climatic Data Center Veach-Baley Federal Building 151 Patton Avenue Asheville, NC 28801-5001 Email: Dan.Swank@xxxxxxxx Phone: 828-271-4007 =======================================
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