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[IDV #HDU-702111]: Contours over Topography Error

> Hi Andrea,
> 
> Just touching base with you that we are looking into this issue. The problem 
> is
> we can reproduce this issue, but intermittently. Sometimes it works, sometimes
> it does not and we get the error you report. Is this what you observed?
> 
> You may wish to try in the IDV Dashboard, Field Selector tab, right-click on 
> the
> elevation data (data.nc), go to Properties, Spatial Subset Tab and subset over
> North America assuming that is your region of interest. Now plot the contours
> and wind vectors as you were doing.
> 
> Subsetting seems to help, but not consistently unfortunately. See the attached
> bundle for an example.
> 
> Apart from that, we will continue to look into this matter.
> 
> Best,
> 
> Unidata IDV Support
> 

Hi Andrea,

The problem of using the topography data you downloaded from (from: 
http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NGDC/.GLOBE/.topo/) is that the 
elvelation
field is in (longitude, latitude) and the datasets of GFS or HRRR are in 
(latitude, longitude), and the elevation of topo file is from (-180, 180), the 
GFS
is from (0, 360). So, it is impossible for the IDV to do both swapping the 
lat/lon and subset to the region of wind vector field.

In general, you should use the geopotential height at the ground level as your 
topo field when creating the display of Vectors Over Topography. Doing so can 
avoid the
problem you were experienced.


Yuan
> 
> > Full Name: Andrea LaRocca
> > Email Address: address@hidden
> > Organization: Plymouth State University
> > Package Version: 5.3 build date:2016-05-23 19:17 UTC
> > Operating System: Windows 7
> > Hardware: Java: home: C:\Program Files\IDV_5.3\jre version: 1.8.0_45 
> > j3d:1.6.0-pre9-daily-experimental daily
> > Description of problem: Creating display: Vectors Over Topography
> > visad.SetException: visad.SetException: Gridded2DSet: samples do not form a 
> > valid grid
> > Gridded2DSet: samples do not form a valid grid
> >
> > I am running IDV v5.3 on both a Mac and PC and have imported a 3-D 
> > Topography field (from: 
> > http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NGDC/.GLOBE/.topo/) and am 
> > trying to overlay 3-D height contours and wind vectors (initally from HRRR 
> > CONUS 2.5km). When I try and load the display the above error message shows 
> > up. I have tried different catalog model runs (GFS 20/40/80km) and 
> > different parameters (1000-500mb thickness, geostrophic wind vectors) as 
> > well as, but the same message keeps popping up.
> >
> > ******************
> > Stack trace:
> > visad.SetException: Gridded2DSet: samples do not form a valid grid
> > at visad.Gridded2DSet.<init>(Gridded2DSet.java:99)
> > at visad.Gridded2DSet.<init>(Gridded2DSet.java:56)
> > at ucar.unidata.data.grid.GridUtil.swapLatLonFF(GridUtil.java:6788)
> > at ucar.unidata.data.grid.GridUtil.swapLatLon(GridUtil.java:6689)
> > at 
> > ucar.unidata.data.grid.DerivedGridFactory.create2DTopography(DerivedGridFactory.java:949)
> > at 
> > ucar.unidata.data.grid.DerivedGridFactory.create2DTopography(DerivedGridFactory.java:844)
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> > at java.lang.reflect.Method.invoke(Unknown Source)
> > at 
> > org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
> > at 
> > org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
> > at org.python.core.PyObject.__call__(PyObject.java:478)
> > at org.python.core.PyObject.__call__(PyObject.java:482)
> > at org.python.pycode._pyx77.f$0(<string>:1)
> > at org.python.pycode._pyx77.call_function(<string>)
> > at org.python.core.PyTableCode.call(PyTableCode.java:167)
> > at org.python.core.PyCode.call(PyCode.java:18)
> > at org.python.core.Py.runCode(Py.java:1386)
> > at org.python.core.__builtin__.eval(__builtin__.java:497)
> > at org.python.core.__builtin__.eval(__builtin__.java:501)
> > at org.python.util.PythonInterpreter.eval(PythonInterpreter.java:251)
> > at ucar.unidata.data.DerivedDataChoice.getData(DerivedDataChoice.java:795)
> > at ucar.unidata.data.DataChoice.getData(DataChoice.java:628)
> > at ucar.unidata.data.DataInstance.getData(DataInstance.java:243)
> > at ucar.unidata.data.DataInstance.getData(DataInstance.java:207)
> > at ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:206)
> > at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:163)
> > at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:144)
> > at 
> > ucar.unidata.idv.control.GridDisplayControl.doMakeDataInstance(GridDisplayControl.java:294)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:3319)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:3275)
> > at 
> > ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:664)
> > at 
> > ucar.unidata.idv.control.FlowPlanViewControl.setData(FlowPlanViewControl.java:300)
> > at ucar.unidata.idv.control.PlanViewControl.init(PlanViewControl.java:489)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1441)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1124)
> > 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: HDU-702111
Department: Support IDV
Priority: Normal
Status: Open
===================
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