Re: [thredds] aggregation / arithmetic between variables

• To: Jay Alder <jay.alder@xxxxxxxxxxxxxxxxxxx>
• Subject: Re: [thredds] aggregation / arithmetic between variables
• From: Roland Schweitzer <Roland.Schweitzer@xxxxxxxx>
• Date: Fri, 15 Apr 2011 10:30:06 -0500

Hi,

Jon, any suggestions for how to track down this error?

Roland

java.lang.NullPointerException

    at thredds.server.wms.ThreddsDataset.<init>(ThreddsDataset.java:102)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

    at java.lang.Thread.run(Thread.java:662)

On 04/12/2011 09:38 PM, Jay Alder wrote:

Have there been any updates on this? It would be ideal if I could use F-TDS to 
create anomalies between two datasets and plot them via WMS. It is possible to 
do this offline and add the product NetCDF files to the thredds catalog, but 
there are so many permutations its would make my thredds catalog very 
verbose/cluttered.

On Apr 1, 2011, at 4:11 PM, Roland Schweitzer wrote:

On 04/01/2011 11:12 AM, Jay Alder wrote:

While we're on the topic, can F-TDS serve WMS or just OpENDAP? Essentially what 
I'd like to do is get a WMS map for dataset A - dataset B.

A virtual variable in F-TDS behaves like any other netCDF variable being served 
by TDS, so if it has the characteristics of a variable for which WMS works it 
will also be available via WMS.  At least in theory.

However, when we tried it ourselves we get this error from the WMS software:

2011-04-01T15:50:05.338 -0700 [    326689][      26] ERROR - 
thredds.server.wms.ThreddsWmsController - dispatchWmsRequest(): Exception:
java.lang.NullPointerException
         at 
uk.ac.rdg.resc.ncwms.cdm.CdmUtils.getOptimumDataReadingStrategy(CdmUtils.java:221)
         at thredds.server.wms.ThreddsDataset.<init>(ThreddsDataset.java:102)
         at 
thredds.server.wms.ThreddsWmsController.dispatchWmsRequest(ThreddsWmsController.java:164)
         at 
uk.ac.rdg.resc.ncwms.controller.AbstractWmsController.handleRequestInternal(AbstractWmsController.java:195)
         at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
         at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
         at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
         at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
         at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
         at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
         at 
thredds.servlet.filter.RequestQueryFilter.doFilter(RequestQueryFilter.java:121)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
         at 
thredds.servlet.filter.RequestPathFilter.doFilter(RequestPathFilter.java:105)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
         at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
         at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
         at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
         at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
         at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
         at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
         at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
         at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
         at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
         at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
         at java.lang.Thread.run(Thread.java:662)

The two netCDF URL's are:

Original data set:
http://ferret.pmel.noaa.gov/geoide/carbontracker.html?dataset=ct_flux

Data set with a new variable (ft1000):
http://ferret.pmel.noaa.gov/geoide/catalog/las/catalog.html?dataset=las/test_ftds_wms.jnl

Roland

Thanks

On Apr 1, 2011, at 8:40 AM, Roy Mendelssohn wrote:

yes it can.  Instructions are at that link.  I've done it several times and can 
help people walk through it once they get Ferret installed.

-Roy

On Apr 1, 2011, at 8:37 AM, Kevin Manross wrote:

Kyle,

I'm interested in the same thing.  Can F-TDS be run without the entire LAS 
system?

Thanks!

-kevin.


On Fri, Apr 1, 2011 at 10:23 AM, Kyle Wilcox<KWilcox@xxxxxxxxxxxxxx>  wrote:
That functionality doesn't exists in TDS.  You will need to postprocess the 
files, or use F-TDS (Ferret TDS) to accomplish:

http://ferret.pmel.noaa.gov/LAS/documentation/the-ferret-thredds-data-server-f-tds/

---------
Kyle Wilcox, Engineer
Applied Science Associates
55 Village Square Drive
South Kingstown, RI 02879
p: (401) 789-6224
e: kwilcox@xxxxxxxxxxxxxx

-----Original Message-----
From: thredds-bounces@xxxxxxxxxxxxxxxx [mailto:thredds-
bounces@xxxxxxxxxxxxxxxx] On Behalf Of Ivan PRICE
Sent: Friday, April 01, 2011 11:14 AM
To: thredds@xxxxxxxxxxxxxxxx
Subject: [thredds] aggregation / arithmetic between variables


Hi again,

I'm sorry to ask so many questions, i am looking around before asking
these..

My next problem is that I'd like to define a 'virtual variable' that is
the result of simple operations on existing variables, for example a
new
variable that is the sum of 2 existing ones.

I have read all about aggregating between datasets and over dimensions
such as time, but i think this is different. My goal is to have a
virtual WMS layer that is the result of the relationship between
existing variables.

Does this sort of functionality exist at this stage, or should i be
pre-processing the dataset before the thredds stage ?

cheers and have great weekends

-i



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**********************
"The contents of this message do not reflect any position of the U.S. Government or 
NOAA."
**********************
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Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
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• Follow-Ups:
  • [thredds] WMS and F-TDS virtual datasets [was: Re: aggregation / arithmetic between variables]
    • From: Ethan Davis
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Roy Mendelssohn

• References:
  • [thredds] aggregation / arithmetic between variables
    • From: Ivan PRICE
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Kyle Wilcox
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Kevin Manross
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Roy Mendelssohn
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Jay Alder
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Roland Schweitzer
  • Re: [thredds] aggregation / arithmetic between variables
    • From: Jay Alder