[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDFJava #XIR-445342]: Problem with netCDF-Java CoordinateAxis returning wrong values

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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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.

  • Subject: [netCDFJava #XIR-445342]: Problem with netCDF-Java CoordinateAxis returning wrong values
  • Date: Tue, 11 Jun 2013 09:45:35 -0600
Hi Tom 

Looks like it might be getting confused by the -999 missing values.
It appears to be swath data, but do you know why so many missing values ?

John


> Hi --
> 
> In the latest version of the IDV which I believe uses netCDF 4.3, when
> I try to read  the "11 micron temperature" variable (and others) in
> this file:
> 
> <ftp://ftp.ssec.wisc.edu/pub/ssec/tomw/NSS.GHRR.NF.D86275.S0857.E1038_NASA_LaRC_cloud_properties_3chan5.nc>
> 
> as a "grid", the longitude values in the file  are returned to the
> IDV's GeoGridAdapter are in the range of -354.6691 to -197.32988.  In
> the file (from ToolsUI dump), however, they are in the range of
> 5.33089 to 162.67013.  It appears that when the values are retrieved
> using the CoordinateAxis2D.getCoordValue(), that 360 is being
> subtracted from the values.
> 
> As a note, if I look at the values in CoordinateAxis2D.getMaxValue()
> and getMinValue(), the values are 162.67013 and 5.33089.
> 
> I tried fiddling with the metadata for the "longitude" variable to
> standardize the attributes, but to no avail....except, of course, to
> use an "add_offset" value of 360...
> 
> We tested this in the previous version of the IDV (3.1) and the
> original file geolocates just fine....
> 
> I hope you can help....soon....
> 
> Thanks.
> 
> tom
> 
> --
> Tom Whittaker
> University of Wisconsin-Madison
> Space Science & Engineering Center (SSEC)
> Cooperative Institute for Meteorological Satellite Studies (CIMSS)
> 1225 W. Dayton Street
> Madison, WI  53706  USA
> ph: +1 608 262 2759
> 
> 


Ticket Details
===================
Ticket ID: XIR-445342
Department: Support netCDF Java
Priority: Normal
Status: Open