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[IDV #CQF-979333]: export satellite image to netcdf



> 
> I'm not sure if you have time to revisit this, but I thought I'd ask
> since perhaps other people are back from Christmas break.  You were
> right: it can take a very long time to cut-and-paste.  You warned me
> about this earlier, but when I first tried it, it took less than 5
> seconds.  I don't know if my test case was adequately sized, or if I
> passed some threshold, but it took about half an hour for one
> cut-and-paste action.  And that just one of 2000 or so times.  Is there
> any other way to get out the lat and lon information from the satellite
> image?
> 

Hi David,
      The answer is yes. To it you need to: first save the image to a nc grid 
file, and then load the nc file back to the IDV and use the "Formulas > Export 
> Export Grid to Excel" in the Field Selector to create the excel file with 
lat/lon.

> I've done a variety of things.  I tried a jython function on the IDV
> webpage
> http://www.unidata.ucar.edu/software/idv/docs/userguide/tools/JythonLib.html
> called|extractLatitudeFromNWPGrid|.   I was able to extract the latitude
> of each pixel in the satellite image, but I could not figure out how to
> extract longitudes.  I tried the command "extractLongitudeFromNWPGrid",
> but it doesn't seem to exist.  Oddly there is no corresponding jython
> function for longitude...

No, the extract function for longitude is no there. I think extract latitude 
function is a side product of creating coriolis grid.

Yuan

> 
> 
> 
> 
> 
> > Hi David.
> >
> > Dashboard -->  Field Selector Tab  -->  Displays Panel -->  General -->  
> > Grid Table -->  Create Display
> >
> > This action will produce a data table.
> >
> > Copy and paste your data into a text file.
> >
> > -Julien
> >
> >> Thanks for the heads up about PTO.   Here's an .xidv file.
> >>
> >> Have a good vacation!
> >>
> >>
> >>
> >> On 12/21/2010 03:19 PM, Unidata IDV Support wrote:
> >>> Hi David.
> >>>
> >>> At this point I need to know more about the data you are looking at. 
> >>> Please send over some bundles and / or put some data files at 
> >>> http://motherlode.ucar.edu/repository/alias/idvupload.
> >>>
> >>> Thanks.
> >>>
> >>> -Julien
> >>>
> >>> PS I am on PTO for the next couple of days so support may be slow  with 
> >>> the upcoming Christmas holiday. I will be around next week though.
> >>>
> >>>
> >>>> Hi Julien  -
> >>>>
> >>>> I did what you suggested, but the results look similar to before. The nc
> >>>> file still has no lat/lon arrays.  Maybe I'm not doing what you
> >>>> suggested correctly  When you say "sub-setting", is that what I did when
> >>>> I requested a 600x1100 pixel grid centered on 14.5N -68 E in the Data
> >>>> Choosers panel? Or is it something more?
> >>>>
> >>>> --Dave
> >>>>
> >>>>
> >>>>
> >>>>> Hi David.
> >>>>>
> >>>>> I would generate the image you want (sub-setting the data as you wish) 
> >>>>> in the projection you want and then:
> >>>>>
> >>>>> Dashboard -->    Displays Tab -->    File Menu -->    Save -->    
> >>>>> Export displayed data to netCDF
> >>>>>
> >>>>> Give that a shot and let us know how it goes.
> >>>>>
> >>>>> -Julien
> >>>>>
> >>>>>> Full Name: David ahijevych
> >>>>>> Email Address: address@hidden
> >>>>>> Organization: ncar
> >>>>>> Package Version:
> >>>>>> Operating System:
> >>>>>> Hardware:
> >>>>>> Description of problem: First I'll state my goal. If you know a way to 
> >>>>>> do this, then perhaps my netCDF question is irrelevant.  Ultimately 
> >>>>>> I'd like to calculate the mean IR cloud top temperature in concentric 
> >>>>>> rings around a tropical storm.
> >>>>>>
> >>>>>> My netCDF question is: how to I export the 2-D lat/lon arrays with the 
> >>>>>> image?  I exported the image array using exportGridToNetcdf, but it is 
> >>>>>> in satellite projection and I don't know how to convert that to 
> >>>>>> lat/lon.
> >>>>>> Thanks - !
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> Ticket Details
> >>>>> ===================
> >>>>> Ticket ID: CQF-979333
> >>>>> Department: Support IDV
> >>>>> Priority: Normal
> >>>>> Status: Closed
> >>>>>
> >>> Ticket Details
> >>> ===================
> >>> Ticket ID: CQF-979333
> >>> Department: Support IDV
> >>> Priority: Normal
> >>> Status: Closed
> >>>
> >>
> >>
> >
> > Ticket Details
> > ===================
> > Ticket ID: CQF-979333
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> >
> 
> 
> 


Ticket Details
===================
Ticket ID: CQF-979333
Department: Support IDV
Priority: Normal
Status: Closed


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