This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Matt, Great, glad to be of assistance. Best, Unidata IDV Support > Hello, > > The issue was the parameter alias was not set. Once I set it, the derived > True Wind Vectors worked. Thank you very much! > > > Matt > > -----Original Message----- > From: Unidata IDV Support [mailto:address@hidden] > Sent: Thursday, February 11, 2016 16:16 > To: Matthew Muscato <address@hidden> > Cc: address@hidden > Subject: [IDV #ZYC-601489]: Trying to make Wind Barbs from U and V components > > Brian, > > Can you upload your data to > > http://motherlode.ucar.edu/repository/alias/idvupload > > and let us know when it is there? > > You should just be able to plot your vectors by selecting the correct field > under "derived" in the "Field Selector" in the IDV dashboard. You should see a > "True Wind Vectors" option there. > > If not there, it is possible you may have to set a parameter alias to have it > recognize the U and V. > > https://www.unidata.ucar.edu/software/idv/docs/userguide/tools/AliasEditor.html > > Either way, let us know. > > Best, > > Unidata IDV Support > > > Full Name: Matt Muscato > > Email Address: address@hidden > > Organization: Weather Routing, Inc. > > Package Version: 5.2 build date:2015-08-26 18:19 UTC > > Operating System: Windows 7 > > Hardware: Java: home: C:\Program Files\IDV_5.2\jre version: 1.8.0_45 > > j3d:1.6.0-pre9-daily-experimental daily > > Description of problem: > > > > Creating display: Wind Barb Plan View 1 > > > > I created a map with sea heights color shaded and pressure contoured in > > a sold black line. I wanted to plot wind barbs over this from my U and > > V components but it's failing to plot the wind barbs. I'm not sure if > > I'm doing something wrong but I'm going into the Formulas and picking > > "Speed from 2 components" then picking my u component for my x and the > > v component for my v. > > > > Thanks. > > > > ****************** > > Stack trace: > > java.lang.ArrayIndexOutOfBoundsException: 1 > > at ucar.visad.display.FlowDisplayable.setFlowMaps(FlowDisplayable.java:606) > > at ucar.visad.display.FlowDisplayable.setType(FlowDisplayable.java:876) > > at ucar.visad.display.FlowDisplayable.loadData(FlowDisplayable.java:803) > > at > > ucar.unidata.idv.control.PlanViewControl.loadDataAtLevel(PlanViewControl.java:1266) > > at > > ucar.unidata.idv.control.PlanViewControl.loadDataAtLevel(PlanViewControl.java:1176) > > at > > ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:720) > > at > > ucar.unidata.idv.control.FlowPlanViewControl.setData(FlowPlanViewControl.java:275) > > at ucar.unidata.idv.control.PlanViewControl.init(PlanViewControl.java:489) > > at > > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1402) > > at > > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1085) > > at > > ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:986) > > at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:911) > > at ucar.unidata.util.Misc$3.run(Misc.java:1243) > > > > > > > > > Ticket Details > =================== > Ticket ID: ZYC-601489 > Department: Support IDV > Priority: Normal > Status: Closed > > Ticket Details =================== Ticket ID: ZYC-601489 Department: Support IDV Priority: Normal Status: Closed