Re: [thredds] Problems retrieving point data

• To: Evan Thoms <ethoms@xxxxxxxx>
• Subject: Re: [thredds] Problems retrieving point data
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Mon, 20 Aug 2007 18:11:50 -0600

Hi Evan:

I's seeing the problem also, ill check to see whats going on, thanks.

John

Evan Thoms wrote:

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

• References:
  • [thredds] Problems retrieving point data
    • From: Evan Thoms