NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.

[thredds] Problems retrieving point data

Greetings,
I would like to retrieve csv files of MSL, wind direction, and wind speed for specific points, that is, a sounding of forecasted wind data. I am trying to subset the grid accessed through: http://motherlode.ucar.edu:8080/thredds/ncss/grid/fmrc/NCEP/NAM/Alaska_11km/NCEP-NAM-Alaska_11km_best.ncd/pointDataset.html 

and my query url looks like this:

http://motherlode.ucar.edu:8080/thredds/ncss/grid/fmrc/NCEP/NAM/Alaska_11km/NCEP-NAM-Alaska_11km_best.ncd?var=Wind_direction_from_which_blowing&var=Wind_speed&latitude=55&longitude=-160&time_start=2007-08-13T06%3A00%3A00Z&time_end=2007-08-24T00%3A00%3A00Z&temporal=point&time=2007-08-13T06%3A00%3A00Z&vertCoord=&accept=csv&point=true

That is, I am testing with a lat long of 55, -160,
leaving the default Specific Time that comes up when I click the radio button, 
have clicked Wind_direction and Wind_speed under 'with Vertical Levels'
and chosen csv as the output

and yet the returned text is this:
date,lat[unit="degrees_north"],lon[unit="degrees_east"],vertCoord[unit="m"],Wind_direction_from_which_blowing[unit="degrees"],Wind_speed[unit="m s-1"] 
2007-08-13T06:00:00Z,0.0,0.0,0.0,NaN,NaN
If I query the U and V components, it's a little better, although I only get one line of data, not an entire sounding through the pressure levels. 

Can anyone tell me what I am doing wrong?
Also, the data getting returned are just the data stored at the nearest grid node, correct? There isn't any interpolation going on is there? If not, how would I query the 4 nearest grid nodes for a location so that I could do an interpolation? 

Thanks much for any suggestions
Evan

--

Evan Thoms
Geologist\GIS Specialist
U.S. Geological Survey, Alaska Science Center 4200 University Drive, Anchorage, AK 99508 voice: 907-786-7409 fax: 907-786-7401 ethoms@xxxxxxxx
  • 2007 messages navigation, sorted by:
    1. Thread
    2. Subject
    3. Author
    4. Date
    5. ↑ Table Of Contents
  • Search the thredds archives: