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[IDV #LAG-627777]: Data are plotted to wrong locations

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  • Subject: [IDV #LAG-627777]: Data are plotted to wrong locations
  • Date: Fri, 17 Sep 2010 16:41:20 -0600
> Thank you Yuan again for your quick response. I appreciate your time and
> efforts.
> 
> I did the coversion using a tool from one of my colleagues. I do not
> know much about that tool. I will check with him. Is there something you
> can do with IDV to plot it correctly?
> 
> Thanks,
> 
> Junhua

No, the IDV doesn't have this feature.


Yuan
> 
> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden]
> Sent: September 17, 2010 4:20 PM
> To: Zhang,Junhua [Ontario]
> Cc: address@hidden
> Subject: [IDV #LAG-627777]: Data are plotted to wrong locations
> 
> > Hi, Yuan,
> >
> > Thank you very much for checking. The minor change of map position
> > does not matter to me. However, the location of the data is wrong. I
> > am ploting Canadian emissions, but they were plotted to US side.
> > Attached is a plot I just did which shows clealy that the emissions
> > are at US side. I checked the lat, lon in the netcdf file, they seem
> > OK. Could you please check it again?
> >
> > Many Thanks,
> >
> > Junhua
> 
> Hi Junhua,
> 
> I see the problem this time, I am guess you are using some GIS
> software packages to do the conversion. This software package has
> difference setting of y coordinate, and it is the opposite to our netcdf
> convention, that counting the 0 index at the lower left, and you need to
> flip the data after the conversion.
> 
> 
> Yuan
> 
> >
> >
> >
> > -----Original Message-----
> > From: Unidata IDV Support [mailto:address@hidden]
> > Sent: September 17, 2010 3:51 PM
> > To: Zhang,Junhua [Ontario]
> > Cc: address@hidden
> > Subject: [IDV #LAG-627777]: Data are plotted to wrong locations
> >
> > > Dear IDV developer,
> > >
> > > I am using IDV 2.9u1 to plot some netcdf data. Originally the data
> > > is in netcdf format. When I plotted it using IDV, the location of
> > > the data is correct as seen in "Original_field.jpg". I then
> > > converted it into other data format and did some data modification.
> > > After that I converted it back to netcdf format. Unfortunately, IDV
> > > plotted the new
> >
> > > netcdf data onto different locations. More specifically, it changed
> > > the north-south direction as seen in "After_conversion.jpg". Please
> > > noted that the data was modified. Therefore, the values are not the
> > > same but the location should be the same.
> > >
> > > I also attached the "after conversion" netcdf file in this email. I
> > > checked the data using "ncdump". It looks fine. Could you please
> > > check
> >
> > > why IDV could not plot it correctly?
> > >
> > > Thank you in advance for your kindly help,
> > >
> > > Junhua
> > >
> > Hi Junhua,
> >
> > The minor change in the map position might be caused by the lose
> > precision in your conversion process, I am not sure how you control
> > the precision in the new file, if it is a jave program, change the
> > variable type to double instead of float may help.
> >
> >
> > Yuan
> >
> > Ticket Details
> > ===================
> > Ticket ID: LAG-627777
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: LAG-627777
> Department: Support IDV
> Priority: Normal
> Status: Closed
> 
> 


Ticket Details
===================
Ticket ID: LAG-627777
Department: Support IDV
Priority: Normal
Status: Closed