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[IDV #LTA-507350]: IDV

> Yuan,
> It is obvious that when you increase the projection to lat/lon, it will 
> increase in size.
> The number of grid points will change.
> But the question is different.
> Do you maintain the same resolution ( for example in my case 10.7)of the 
> native in the lat/lon projection.

The grid dataset is in the same resolution. But the on screen image may not be 
in the same resolution.

> If so, can you please help me with a netcdf  in the lat/lon projection?

What do you want to do with a nc lat/lon projection?

> Is there a number I can call or you may call in my cell number 405-778-9926.
> I think my email was not clear enough so that I can explain to solve my 
> problem.
> 
I think I still not understand your problem very well ;)

Yuan
> 
> Thanks a lot,
> Lalitha
> 
> 
> 
> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden]
> Sent: Tuesday, March 22, 2011 10:13 PM
> To: Lalitha Venkatramani
> Cc: address@hidden
> Subject: [IDV #LTA-507350]: IDV
> 
> 
> 
> On Tue, 22 Mar 2011, Lalitha Venkatramani wrote:
> 
> > New Client Reply: IDV
> >
> > Save the image as png.
> > You will see the number of pixels in grib and in world projection
> > When you open the image and look at properties, you will see the number of 
> > pixels.
> >
> > Is your netcdf in latlon or native lc projection?
> > If it is lc, it will be identical to grib.
> > May be if you can redirect the email to the developer of this  area, we may 
> > have an answer.
> 
> What you think about incresing the resolution is incorrected. When you
> change the projection of the display, the size of the image you saved may
> change as the area covered changed. But the resolution is still the
> same.
> 
> 
> Yuan
> > > Thanks,
> > Lalitha
> >
> > -----Original Message-----
> > From: Unidata IDV Support [mailto:address@hidden]
> > Sent: Tuesday, March 22, 2011 6:19 PM
> > To: Lalitha Venkatramani
> > Cc: address@hidden
> > Subject: [IDV #LTA-507350]: IDV
> >
> >
> >
> > On Tue, 22 Mar 2011, Lalitha Venkatramani wrote:
> >
> > > New Client Reply: IDV
> > >
> > > Ok, IDV image looks great. That is the reason I am trying to understand 
> > > the projection.
> > >
> > > As I explained in my email,
> > > minimum lat is 13.8992
> > >  maximum lat is 65.3821
> > >  minimum lon is -144.517
> > >  maximum lon is  41.9596
> > >
> > > Rows, columns, xres and yres ( xres and yres in meters)of the lambert 
> > > conformal  projection:480 576 10700 10700
> > > > Resolution in lambert conformal is 10700 meters. When I display using 
> > > > IDV, I get the image with properties set to 576 X 480 pixels.
> > >
> > > If you convert the lambert projection to latlon , FOR THE SAME RESOLUTION 
> > > 10.7 km, Latitude points are roughly,
> > >
> > > Latitude spans 52 degrees
> > > 1 degree is 100 km. so, roughly 520 points for a 10 km resolution
> > >
> > > Latitude spans = 103 degrees roughly - s0, 1030 grid points for a 10 km 
> > > resolution.
> > >
> > > When I convert the original grib file to projections/predefined/world in 
> > > IDV and display in lat/lon projection.
> > I see IDV shows 1203 x 918 points and the image looks great.
> > >
> > >
> >
> > I did the same convertion as you, but I am not sure how do you
> > see how many points in the IDV display. What I did is to export the
> > display image
> > to the nc file, and then I can tell the same number of points in both
> > projection.
> >
> >
> > Yuan
> > > You may notice, I use 10 km resolution which is the resolution in the 
> > > grib file.
> > >
> > > So, I am just interested to know if you use the same resolution.
> > > Can you please tell me how do you convert lambert to world?
> > >
> > > I see your source code, but I could not locate that area yet.
> > >
> > >
> > > Thanks a lot,
> > > Lalitha
> > >
> > > -----Original Message-----
> > > From: Lalitha Venkatramani
> > > Sent: Tuesday, March 22, 2011 5:51 PM
> > > To: 'address@hidden'
> > > Subject: RE: [IDV #LTA-507350]: IDV
> > >
> > > Ok, IDV image looks great. That is the reason I am trying to understand 
> > > the projection.
> > >
> > > As I explained in my email ,
> > > minimum lat is 13.8992
> > >  maximum lat is 65.3821
> > >  minimum lon is -144.517
> > >  maximum lon is  41.9596
> > >
> > > Rows, columns, xres and yres ( xres and yres in meters)of the lambert 
> > > conformal  projection:480 576 10700 10700
> > > > Resolution in lambert conformal is 10700 meters. When I display using 
> > > > IDV, I get the image with properties set to 576 X 480 pixels.
> > >
> > > If you convert the lambert projection to latlon , FOR THE SAME RESOLUTION 
> > > 10.7 km,
> > > Latitude points are roughtly,
> > >
> > > Latitude spans 52 degrees
> > > 1 degree is 100 km. so, roughly 520 points for a 10 km resolution
> > >
> > > Latitude spans = 103 degrees roughly - s0, 1030 grid points for a 10 km 
> > > resolution.
> > >
> > > When I  convert the original grib file to projectons/predefined/world in 
> > > IDV and display in lat/lon projection. I see IDV shows 1203 x 918 points 
> > > and the image looks great.
> > >
> > >
> > > You may notice, I use 10 km resolution which is the resolution in the 
> > > grib file.
> > >
> > > So, I am just interested to know if you use the same resolution.
> > > Can you please tell em how do you convert lambert to world?
> > >
> > > I see your source code, but I could not locate that area yet.
> > >
> > >
> > > Thanks a lot,
> > > Lalitha
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Unidata IDV Support [mailto:address@hidden]
> > > Sent: Tuesday, March 22, 2011 11:53 AM
> > > To: Lalitha Venkatramani
> > > Cc: address@hidden
> > > Subject: [IDV #LTA-507350]: IDV
> > >
> > > > Dear Support,
> > > > I have a grib file with
> > > > Min/Max Lat/Lon 13.8992 -144.517 65.3821 -41.9596
> > > > Rows, columns, xres and yres ( xres and yres in meters)of the lambert 
> > > > conformal  projection:480 576 10700 10700
> > > > Resolution in lambert conformal is 10700 meters. When I display using 
> > > > IDV, I get the image with properties set to 576 X 480 pixels.
> > > >
> > > > I use projectons/predefined/world in IDV and display in lat/lon 
> > > > projection.
> > > > I see for the converted image ( 1203 X918) pixels.
> > > >
> > > > If the native resolution 10.7 km ( roughly 0.1 degree is maintained, I 
> > > > am wondering how we get 1203 X918 pixels.
> > > >
> > > > Thanks,
> > > > Lalitha
> > > >
> > > I loaded an image and changed the projection, I didn't see any resolution 
> > > change, can you give me more detail information of what you were doing?
> > >
> > >
> > > Yuan
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: Unidata IDV Support [mailto:address@hidden]
> > > > Sent: Tuesday, March 22, 2011 10:55 AM
> > > > To: Lalitha Venkatramani
> > > > Cc: address@hidden
> > > > Subject: [IDV #LTA-507350]: IDV
> > > >
> > > > > Dear Support,
> > > > >
> > > > > I am using IDV to display grib files.
> > > > >
> > > > > When I convert lambert to Latlon using projectons/predefined/world, I 
> > > > > get
> > > > > lat/lon projection.
> > > > >
> > > > > Do you maintain the native resolution in this conversion?
> > > > >
> > > > > I can send my file and discuss more when I hear from you?
> > > > >
> > > > > Thanks,
> > > > > Lalitha
> > > > >
> > > >
> > > > Hi Lalitha,
> > > > I don't think the resolution being changed in this conversion.
> > > >
> > > >
> > > > Yuan
> > > > >
> > > >
> > > >
> > > > Ticket Details
> > > > ===================
> > > > Ticket ID: LTA-507350
> > > > Department: Support IDV
> > > > Priority: Normal
> > > > Status: Closed
> > > >
> > > >
> > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: LTA-507350
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Open
> > >
> > >
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: LTA-507350
> > > Department: Support IDV
> > > Priority: Normal
> > > Status: Open
> > > Link:  
> > > https://www.unidata.ucar.edu/esupport/staff/index.php?_m=tickets&_a=viewticket&ticketid=12991
> > >
> >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: LTA-507350
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: LTA-507350
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> > Link:  
> > https://www.unidata.ucar.edu/esupport/staff/index.php?_m=tickets&_a=viewticket&ticketid=12991
> >
> 
> 
> 
> Ticket Details
> ===================
> Ticket ID: LTA-507350
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 


Ticket Details
===================
Ticket ID: LTA-507350
Department: Support IDV
Priority: Normal
Status: Open