Dear Kenneth,
Thanks a lot for you effort to reply my mail.
The problem is solve now. It was simpler than it looks. It only because
the data produced in this way is 4-D (x,y,z,t). When I convert it into
3-D(x,y,t)
everything is fine.
But I have some other problems: the Paraview *crashes* when I'm making
movie
or just make many png files series. I was forced to cut the time steps
into many
small pieces in order to keep Paraview running. It makes no difference
whether
use 1fps or 2**n fps.
A few months ago I could make avi formatted movie without any problem. And
in the time nothing has changed with my computer. By the way I'm using
version 3.10.
Cheers!
Xueli
Moreland, Kenneth wrote:
OK. I see now. Clearly I'm not familiar with the GrADS software or its
data formats. If someone else on the ParaView mailing list is familiar
with GrADS it would be great if they speak up, but according to the mail
archives GrADS has not yet been discussed.
I suspect the problem is that ParaView simply does not know how to read
the type of netCDF files written by GrADS. NetCDF is not a completely
specified file format. Rather, it is a collection of arrays that are
"self describing." That is, the arrays and dimensions are named and can
have properties, but to read them properly you really have to understand
what these metadata mean.
There are actually several readers in ParaView that use netCDF as the
underlying technology, but only one that makes an attempt to generally
read unknown "conventions." It will assume that arrays are regular grids
with up to three physical dimensions (x/y/z or lat/lon/z) and optionally a
time dimension. Based on about 5 minutes looking at the GrADS web pages,
I'm guessing that the netCDF file GrADS is outputting contains 5
dimensional arrays. In this case, the ParaView reader won't know what to
do with 5 dimensions and will therefore issue an error if you try to read
one. (You never actually said what went wrong, but perhaps that is it.)
I'm sorry that probably none of this is helping. Ultimately, it sounds
like a new reader would have to be created for ParaView.
-Ken
On 3/13/12 2:28 AM, "wang"<[email protected]> wrote:
Thanks for your reply.
Grads is a software package that widely used by meteorological societies
worldwide. http://www.iges.org/grads/.
The nc file I get can be shown by ferret (which is also a software
package
used by earth science communities) and Grads (Grads can read binary and
data).
The problem may occurred by conversion...
Xueli
Moreland, Kenneth wrote:
I don't know what you mean by a "grad" or what problem it is causing, so
I'm going to make a total guess. I am guessing that you mean gradian (a
unit equal to 9/10 of a degree). Furthermore, because I can't think of
any other way such units would mess you up, I am guessing that you are
trying to write spherical coordinates in terms of gradians, but ParaView
is interpreting them either as degrees or as Cartesian coordinates.
Assuming that this is the problem, it is caused by the fact that the
default netCDF reader for ParaView honors the CF convention
(http://cf-pcmdi.llnl.gov), and the CF convention specifies spherical
coordinates in terms of degrees. To specify angles in any other units
is
to break the convention.
Your best solution is to convert your gradians to degrees (it's OK to
have
floating-point degrees) and write a netCDF file that properly follows
the
CF convention.
If I have completely missed the point of your question, you'll have to
better explain what are grads and what problem you are having with them.
-Ken
On 3/12/12 10:13 AM, "wang"<[email protected]> wrote:
Dear Paraview users,
I have problem with data that origin of grads. We have a program to
convert grads data into NetCDF format. But this data can not be shown
in
Paraview. I don't have any problem to show normal nc data.
Have you ever experience the same problem?
Thanks!
Xueli
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