Hi Dave-
I know Jeff answered you personally on this, but I'm replying to
the list for the benefit of others who've seen your post.
First, this is a bug in 2.1 but has been fixed in the latest
nightly/beta release at:
http://www.unidata.ucar.edu/software/idv/release/nightly
The problem is that older Level II files have no geolocation
information in them (i.e. where they are). In previous versions
of the IDV, we used the chooser to force the location instead
of looking in the file. When we moved to the new Common Data
Model (CDM) way of reading the Level II files, this functionality
got lost. By default, if there is no geolocation information,
we set the location of the radar to 0 lat/ 0 lon.
You have a couple of options with version 2.1:
- After loading in the dataset, double click on the Data Source
in the Field Selector to bring up the Properties dialog. Select the
correct location from the list. Then, plot your data.
- use the old way of reading in the data by clicking off the
"Use CDM" checkbox in the Level II selector. This eliminates
one step, but we have found that the displays are sometimes
not correct.
One more note is that there are problems with the CAPPI displays
for Level II data in versions 2.1 and earlier. We have fixed that
also in the latest releases.
Don Murray
Dave Dempsey wrote:
IDV users,
We have some Level II radar data on a local file system and are trying
to plot it using the IDV (v.2.1 on various Macs), following the
instructions in the Users Guide. We can plot the data themselves OK, but
the map background is centered at 0 degrees N and 0 degrees E (in
Africa's Gulf of Guinea) no matter what we've tried.
The data are in a local file named KOAX20040522_011610. (I've also tried
renaming it KOAX_20040522_0116.) I've tried placing the file in a
directory called KOAX and also in a directory called OAX. The file (and
a number of others like it) are accessible on the Web at:
http://funnel.sfsu.edu/data/cases/jm/040522_nebraska_trndos/LevII/KOAX/.
Here's the procedure(s) we've tried:
(1) New Data Source > From the File System. In the "FIles" list,
click on "Radar". Select "Omaha/Valley" from the "Radar Location" menu.
Navigate to the directory containing the data file. Select the file.
Click on the "Add Source" button.
(2) In the Dashboard, under "Data Sources", I get the entry "Level II
Radar Data (XXXX)", so it appears that the IDV doesn't know where the
station is, even though it was specified using the "Radar Location" menu
and resides in a directory called KOAX (or OAX). In the "Fields" window
a list of fields appears. Selecting a field and a display type and
clicking on the "Create Display" button produces a display. It is
located in the Gulf of Guinea.
On the Map Display - One Pane" window, under "Displays", the field is
identified as "XXXX Reflectivity - 2D Radar Sweep View". Clicking on
this name produces a Dashboard dialog window in which the station is
correctly identified as "OAX Lat: 41.3 Lon: -96.4 Alt: 350.0".
None of these problems occur if I access Level II data via an ADDE server.
Can anyone spot what we might be doing wrong? (I think I've been here
before but can't remember the answer!)
-- Dave
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* Dr. Dave Dempsey | ^ ___ \|/ *
* Dept. of Geosciences | ) ^ /||_||\ --0-- *
* San Francisco State University | ) ) / ||_|| \ /|\ *
* 1600 Holloway Ave. | ) ) / ||_||
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* | ) )
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Begin forwarded message:
From: John Monteverdi <montever@xxxxxxxxxxxxx>
Date: March 13, 2007 3:59:37 PM PDT
To: Dave Dempsey <ddempsey@xxxxxxxxxxxxxxx>
Subject: Bug in idV...running on Pentium Macs
Dave,
I think I encountered a pretty serious bug in iDV (and Nexrad Radar
Viewer) running on "tornado" but not on my home desktop (which is not
Pentium).
I downloaded Level II and Level III data sets for February 25, 2004
for KMUX. On idv these data sets misplot geographically. The Level
II stuff plots at too small a scale relative to the map background
(meaning, echoes over SF appear over San Mateo). On Nexrad Radar
Viewer, the option to "smooth" the radar crashes the software.
Both idv and Nexrad Radar Viewer run OK and plot OK at home.
Thus, I think the issue might be with the Pentium chip, and/.or Java
running natively on a Pentium Mac.
John
--
*************************************************************
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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