Kevin-
Kevin R. Tyle wrote:
Thanks Don! I need to keep you busy before you leave!!!
No rest for the weary. ;-)
Couple related questions:
1. Is there a way (or future plans for) to use a different vertical
coordinate than height? Typically in a cross section one uses pressure
as the y-axis.
It's on the todo list, but with Jeff and I leaving, it probably won't
happen soon.
Also, when using isosurfaces with one parameter colored
by another, it would be nice to be able to have, say, the jet core
colored by pressure in hPa instead of geopotential height in gpm.
For the colored-by parameter, you could select Formulas->Grid->Define a
Grid Diagnostic and in the dialog enter the formula
extractPressureFromNWPGrid(a). When prompted for A, pick any field in
the data source that has pressure as it's vertical coordinate. This
will create a pressure grid and then use it to color the wind speed
isosurface.
2. Can parameters be scaled (aka like the SCALE parameter in GEMPAK) by
powers of ten? Say I wish to display height values in decameters
instead of meters?
Tom Whittaker wrote:
> In the Display Control, click on the "Edit" menu and "Change Display
> Unit". For example, if the unit is "gpm", change it to "gpm*10". You
> will have to change the contour interval stuff as well. Hope that
> helps.
Tom is correct and you can use things like m*10E5. However, it should
automatically adjust the contour values to the new unit (as best it can
when the new unit is not just a scale e.g. K->degF).
If you always want decageopotential meters for height fields, you can
use the Tools->Parameter Defaults Editor to set that, or once you have
it displayed and have the units correct, select the File->Save->Save as
Parameter Default from the control window to do that.
Don
On 05/21/2010 12:36 PM, Don Murray wrote:
Kevin-
Oh sure, just when we are about to do a release, you have to find a
bug. ;-)
I've implemented a fix and it will be in the next nightly build (and
the 2.9 release). Thanks for catching this.
To the list, we are planning a 2.9 full release next week. Please
check out the test release at:
http://www.unidata.ucar.edu/downloads/idv/test
(or the nightly build) and let us know ASAP of any issues you find.
Don
Kevin R. Tyle wrote:
I've run into this problem where if I try to draw cross-sections on a
derived field (e.g., potential temperature) and try to load more than
one forecast time, the display will not appear and I get the
following errors:
ERROR: Creating display: Color-Shaded Cross Section
java.lang.NullPointerException
java.lang.NullPointerException
at
ucar.unidata.data.grid.GridUtil.setSpatialDomain(GridUtil.java:353)
at
ucar.unidata.data.grid.GridUtil.setSpatialDomain(GridUtil.java:333)
at
ucar.unidata.idv.control.CrossSectionControl.make2DData(CrossSectionControl.java:1736)
at
ucar.unidata.idv.control.CrossSectionControl.loadData(CrossSectionControl.java:1582)
at
ucar.unidata.idv.control.CrossSectionControl.loadDataFromLine(CrossSectionControl.java:1566)
at
ucar.unidata.idv.control.CrossSectionControl.applySmoothing(CrossSectionControl.java:1613)
at
ucar.unidata.idv.control.DisplayControlImpl.applyAttributesToDisplayables(DisplayControlImpl.java:1517)
at
ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1066)
at
ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:987)
at
ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:912)
at ucar.unidata.util.Misc$3.run(Misc.java:1089)
The problem also occurs with another derived field (Relative
humidity), and with different NWP models, so I suspect this may be a
general problem with "derived" quantitites. I've run this on both
OSX and Linux 64-bit systems . . .
Thanks,
Kevin
______________________________________________________________________
Kevin Tyle, Systems Administrator **********************
Dept. of Atmospheric & Environmental Sciences ktyle@xxxxxxxxxxxxxxxx
University at Albany, ES-235 518-442-4578 (voice)
1400 Washington Avenue 518-442-5825 (fax)
Albany, NY 12222 **********************
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*************************************************************
Don Murray UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000
(303) 497-8628 Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
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