----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.
_From owner-netcdf-java@xxxxxxxxxxxxxxxx Fri May 13 07:13:08 2005
Received: (from majordo@localhost)
by unidata.ucar.edu (UCAR/Unidata) id j4DDBnqX005490
for netcdf-java-out; Fri, 13 May 2005 07:11:49 -0600 (MDT)
Received: from vimg3.rdg.ac.uk (vimg3.rdg.ac.uk [134.225.1.80])
by unidata.ucar.edu (UCAR/Unidata) with ESMTP id j4DDBmP3005482
for <netcdf-java@xxxxxxxxxxxxxxxx>; Fri, 13 May 2005 07:11:48 -0600
(MDT)
Organization: UCAR/Unidata
Keywords: 200505131311.j4DDBmP3005482
Received: from vimp2.rdg.ac.uk ([134.225.16.91])
by vimg3.rdg.ac.uk (Exim: gateway)
with esmtp id 1DWZx9-0005PU-00
for netcdf-java@xxxxxxxxxxxxxxxx; Fri, 13 May 2005 14:11:43 +0100
Received: from vimh1.rdg.ac.uk ([134.225.16.83])
by vimp2.rdg.ac.uk (Exim: virusscanner)
with esmtp id 1DWZx4-0006yB-00
for netcdf-java@xxxxxxxxxxxxxxxx; Fri, 13 May 2005 14:11:38 +0100
Received: from mercury.nerc-essc.ac.uk ([192.171.166.1])
by vimh1.rdg.ac.uk (Exim: host)
with esmtp id 1DWZx3-0006zl-00; Fri, 13 May 2005 14:11:37 +0100
Received: from sweeney.nerc-essc.ac.uk (sweeney.nerc-essc.ac.uk
[192.171.166.116])
by mercury.nerc-essc.ac.uk (8.12.10/8.12.10) with ESMTP id
j4DDBbXZ010756;
Fri, 13 May 2005 14:11:37 +0100 (BST)
Received: from localhost.localdomain (sweeney [127.0.0.1])
by sweeney.nerc-essc.ac.uk (8.12.8/8.12.8) with ESMTP id j4DDBbwX009402;
Fri, 13 May 2005 14:11:37 +0100
Received: (from apache@localhost)
by localhost.localdomain (8.12.8/8.12.8/Submit) id j4DDBak9009400;
Fri, 13 May 2005 14:11:36 +0100
Received: from brahman.nerc-essc.ac.uk (brahman.nerc-essc.ac.uk
[192.171.166.139])
by www.nerc-essc.ac.uk (IMP) with HTTP
for <ads@xxxxxxxxxxxxxxxxxxxxxxx>; Fri, 13 May 2005 14:11:36 +0100
Cc: support-netcdf-java@xxxxxxxxxxxxxxxx
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
User-Agent: Internet Messaging Program (IMP) 3.2.2
X-Originating-IP: 192.171.166.139
X-Scanner: exiscan *1DWZx4-0006yB-00*BjAtZdRdWiY* (The University of Reading)
Sender: owner-netcdf-java@xxxxxxxxxxxxxxxx
Precedence: bulk
Hello folks,
I was just wondering if anyone in the community has been using the netcdf
library for manipulating GRIB files and if you have come across any problems
related to extracting subsets of data along x-y space of a 4D grid
(T,Z,lat,lon) where size (Z=20,lat=630,lon=899).
When I am trying to extract it at one go, I am getting the following error
messages:
for range:
myList.add(0, new Range(0, 0, 1));
myList.add(1, new Range(0, 9, 2));
myList.add(2, new Range(500, 550, 1));
myList.add(3, new Range(700, 725, 1));
Array arr = myVar.read(myList);
ArrayList newList = new ArrayList();
Error:
java.lang.ArrayIndexOutOfBoundsException: 6630
at ucar.ma2.ArrayFloat.setFloat(ArrayFloat.java:193)
at ucar.ma2.IteratorFast.setFloatNext(IteratorFast.java:61)
at
ucar.nc2.iosp.grib.GribServiceProvider.readXY(GribServiceProvider.java:177)
at
ucar.nc2.iosp.grib.GribServiceProvider.readLevel(GribServiceProvider.java:150)
at
ucar.nc2.iosp.grib.GribServiceProvider.readData(GribServiceProvider.java:134)
at ucar.nc2.NetcdfFile.readData(NetcdfFile.java:848)
at ucar.nc2.Variable._read(Variable.java:737)
at ucar.nc2.Variable.read(Variable.java:451)
at Test2netcdf.readData(Test2netcdf.java:50)
at Test2netcdf.main(Test2netcdf.java:112)
I have to extract the data in two stages.In the first step, I just have to
extract data at a particular time and depth level(s) but all of
latitude-longitude space.
Then, in second stage I have to apply the range for latitude-longitude.
ArrayList myList = new ArrayList();
myList.add(0, new Range(0, 0, 1));
myList.add(1, new Range(0, 9, 2));
myList.add(2, new Range(0, 629, 1));//all of lat
myList.add(3, new Range(0, 899, 1));//all of lon
Array arr = myVar.read(myList);
ArrayList newList = new ArrayList();
int[] newShape = arr.getShape();
newList.add(0, new Range(0, 0, 1));
newList.add(1, new Range(0, (newShape[1]-1), 1));
newList.add(2, new Range(500, 550, 1));//apply range for lat
newList.add(3, new Range(700, 725, 1));//apply range for lon
Array new_arr = arr.sectionNoReduce(newList);
float[] data = (float[])new_arr.copyTo1DJavaArray();
This approach is ok when extracting data from small number of files but the
performance would deteriorate if extracting from 100+ files having quite big
lat-lon spaces.
Your comments would be much appreciated.
Cheers,
Adit
