Re: [las_users] OpenDAP error trying to create LAS difference plot with 2 different LAS versions

[Roland Schweitzer <Roland.Schweitzer@xxxxxxxx>]

Penny,

This data set http://mynasadata.larc.nasa.gov/thredds/dodsC/mcsst_daily.html shows a variable which is 4D (Float32 water_surf_temp[stime = 183][time = 1][lat = 1501][lon = 3600];) when really what I think you are trying to achieve is to create a new variable via aggregation which is 3D that looks like this (Float32 water_surf_temp[time = 183][lat = 1501][lon = 3600];).

In order to do this aggregation you probably created a new time variable and used it a the time dimension of the existing variable in the join existing since each file has exactly the same values in the time variable since the origin is different for each file.

I think you can fix this problem by changing your aggregation to look something like this:

  <dataset name="penny_sst" ID="PENNY_SST" urlPath="penny/sst.nc">
    <serviceName>gridded</serviceName>
    <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2">
      <aggregation dimName="time" type="joinExisting">
        <netcdf location="file:/home/rhs/Users/Oots/mcsst_k10_20050601.nc" coordValue="0."/>
        <netcdf location="file:/home/rhs/Users/Oots/mcsst_k10_20050602.nc" coordValue="24."/>
        <netcdf location="file:/home/rhs/Users/Oots/mcsst_k10_20050603.nc" coordValue="48."/>
        <netcdf location="file:/home/rhs/Users/Oots/mcsst_k10_20050604.nc" coordValue="72."/>
        <netcdf location="file:/home/rhs/Users/Oots/mcsst_k10_20050605.nc" coordValue="120."/>
        <netcdf location="file:/home/rhs/Users/Oots/mcsst_k10_20050606.nc" coordValue="144."/>
      </aggregation>
    </netcdf>
  </dataset>

Then you'll get a nice 3D data variable like the one shown in the screen snap of the resulting data access form.

I'm pretty sure there might still be some problems with your F-TDS installation, but let's start by fixing this aggregation.

Roland



On 10/08/2010 04:37 PM, Roland Schweitzer wrote:

Penny,

I looked around at your TDS server.  I wasn't able to get any of the data sets to load up the HTML page that shows the contents of the data (I only tried a couple).  For example:
 

http://mynasadata.larc.nasa.gov:8080/thredds/dodsC/las/Monthly_NOAA_WindSpeed/data_clm12m1995to2005.nc.jnl.html
and
http://mynasadata.larc.nasa.gov/thredds/dodsC/las/SRB_DAY_ALLSKY_GLOBAL_PAR/catalog.html?dataset=las/SRB_DAY_ALLSKY_GLOBAL_PAR/data_usr_local_fer_data_data_SRB_DAILY_srb_rel3.0_shortwave_daily_utc_par.nc.jnl.html

both timed out.  Therefore I was unable to verify for myself that the "F-" part of the F-TDS server was properly installed.

Assuming that it is, I'm guessing the issue with this particular data set has to do with how it is defined (via  descriptor files).

Would it be possible to have a very small sample of all of the configuration needed to run this data set in an LAS and F-TDS so we can do some local testing?

Roland



Oots, Penny C. (LARC-E301)[SCIENCE SYSTEMS APPLICATIONS] wrote:

I get the following error when trying to produce a difference plot of a parameter that is created using a Thredds server aggregation with LAS 7.0 beta Classic interface, Ferret 6.1:

 

            OPeNDAP Error: Error parsing the text on line 1 at or near: Error

The descriptor object returned from the dataset was null.

Check that the URL is correct.

(OPeNDAP/netCDF Error code 1001)

             Data set: http://mynasadata.larc.nasa.gov/thredds/dodsC/las/mcsst_1dayperweek/data_mynasadata.larc.nasa.gov_thredds_dodsC_sst1perwk.jnl

 

I also get an error trying to create a diffierence plot using a .des descriptor file for this parameter instead of using Thredds.

 

What is confusing is that a single data plot or a time series can be produced using either the Thredds aggregation or the descriptor file version of the data.

 

On our development system (LAS 7.1.2, Ferret 6.2), I tested the difference plot using the thredds aggregation but still get an OpenDAP error for the difference plot (overlay produces plot):

STOP -script mode, ERROR RUNNING SCRIPT

**Internet Data error

             NetCDF: DAP server error (OPeNDAP/netCDF Error code -70)

I also get an error (‘An error occurred in the service that was creating your product.’) when trying Compare and click Difference using the thredds dataset with the V7 UI.

The thredds dataset can be accessed from http://mynasadata.larc.nasa.gov/las13/servlets/dataset, click Sea, then Daily Sea Surface Temperature. (This LAS is not generally used.)

The descriptor file version of this dataset can be accessed from http://mynasadata.larc.nasa.gov/las/servlets/dataset, click Oceans, Daily Sea Surface Temperature. This is our production web site.

This is a real bottleneck for us.  Hope you can help us figure out a solution.

Penny Oots

 

 

 

 

 

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