Jon-
This is probably a discussion better for idvdevelopers so as not to
scare off the non-programmer IDV users ;-) , but....
The IDV uses the VisAD Data model not the netCDF CDM as the basis for
the data it slices and dices. VisAD allows arbitrary samplings into a
grid not limited to rows/columns like netCDF. However, there are IDV
classes that take CDM GeoGrid objects and make the requisite VisAD Fields.
So, another lightweight approach might be to use the
ucar.unidata.data.grid.GeoGridAdapter to create a VisAD FieldImpl from a
GeoGrid and then use
ucar.unidata.data.grid.GridUtil.sliceAlongLatLonLine() to get the slice
as a FieldImpl. Basically, that will be a 2D array that you could then
export to whatever graphics you want. It would require some
understanding of the VisAD data model. It might also need some
adjustments to the GeoGridAdapter methods to use outside the context of
the IDV. But, as Jeff said, we'd trade that knowledge for help
implementing ncWMS in RAMADDA. ;-)
Don
On 1/18/11 6:38 PM, Jeff McWhirter wrote:
Hi Jon,
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?
You can use the IDV in server mode, creating an ISL file that generates a
cross section display and capturing it as an image.
You can see some example code in the ramadda svn tree:
https://sourceforge.net/projects/ramadda/
under src/ucar/unidata/repository/idv/IdvOutputHandler
This is basically a web based implementation of the IDV.
Using the regular Cross Section display to do this would be inefficient
because the display would also be adding itself into a 3D view. However, if
you are interested I could work with you to make any necessary changes to
the IDV base.
Of course, you have to help me implement ncwms in RAMADDA (which I just
started doing last weekend. go figure).
-Jeff
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Don Murray
NOAA/ESRL/PSD and CIRES
303-497-3596
http://www.esrl.noaa.gov/psd/people/don.murray/
