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Re: data source for IDV

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  • Subject: Re: data source for IDV
  • Date: Wed, 26 Mar 2003 12:43:17 -0700
Hans-Juergen,

> 
> It is also possible to update the catalog
> http://www.cdc.noaa.gov/THREDDS/catalog.xml
> 
> Loading data from this catalog (e.g. NCEP or NCEP Reanalyis Pressure Level)
> takes quite a long time (very much data , I guess). I managed to load the NCEP
> u-wind and NCEP v-wind that contain (world-wide?) daily u and v components 
> from
> 1979/01/01 till now. Unfortunately, it is not possible to select a certain 
> date
> and time before loading.

Sometimes connecting to this CDC catalog takes a long time, or even times out.
But connecting to the catalog or selecting a data source from the catalog
is not the same as downloading the actual data. Data
is downloaded by the IDV only when required for a display.  You can
pre-select times to display with the IDV, and only that data is downloaded.
You can read how here 

http://www.unidata.ucar.edu/projects/metapps/idv_help/IDV_selectingParmsTimesDisplays.html#datasourcetimes

The CDC global grids are large, and even for 10 time steps the IDV takes quite a
while
to download data and make displays.

Stuart Wier

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