Jon-
The attached program will get a slice from a grid as a VisAD FieldImpl
and print it out. You can test it using:
java TestSlice
http://motherlode.ucar.edu/repository/entry/show/output:data.opendap/entryid:f20290c6-9ee3-4d5a-b3c0-f72010abfc38/CONUS_80km_20090606_1200.grib1/dodsC/entry.das
Temperature
This is accessing the grid via OPeNDAP from the Unidata RAMADDA server
but you can use a local file.
If you need more help, contact me directly.
Don
On 1/17/11 2:13 PM, Jon Blower wrote:
Dear IDV folk,
I've seen that IDV can produce vertical section plots. I'm interested in
re-using this capability in other software (ncWMS) if possible. I'd like to
produce a plot as a standalone image (i.e. outside the context of Swing or any
particular desktop), ideally as a BufferedImage. Could someone please point me
to the relevant bit in the libraries please?
Thanks,
Jon
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--
Don Murray
NOAA/ESRL/PSD and CIRES
303-497-3596
http://www.esrl.noaa.gov/psd/people/don.murray/
import ucar.unidata.data.grid.GeoGridAdapter;
import ucar.unidata.data.grid.GeoGridDataSource;
import ucar.unidata.data.grid.GridUtil;
import ucar.nc2.dt.grid.*;
import visad.*;
import visad.georef.LatLonTuple;
public class TestSlice {
public static void main(String[] args) throws Exception {
if (args.length == 0) {
System.out.println("Must supply at least a filename");
System.out.println("Usage: java TestSlice <filename> <parameter>");
System.exit(1);
}
String file = args[0];
GridDataset gds = GridDataset.open(file);
GeoGridDataSource ggds = new GeoGridDataSource(null, gds, "my data",
file);
String paramName = "T";
if (args.length > 1) {
paramName = args[1];
}
GeoGrid geoGrid = gds.findGridByName(paramName);
if (geoGrid == null) {
System.out.println("Can't find grid named " + paramName);
System.exit(1);
}
GeoGridAdapter gga = new GeoGridAdapter(ggds, geoGrid);
FieldImpl fi = gga.getSequence();
System.out.println(fi.getType());
FieldImpl slice = GridUtil.sliceAlongLatLonLine(fi, new
LatLonTuple(40,-120), new LatLonTuple(30,-70));
System.out.println(slice);
}
}
