Re: outputting latitudes and longitudes that NCL computes

Hi Anneliese,
Actually, assuming you are plotting this image using trDoNDCOverlay
set to True, it should be possible to acquire the lat/lon locations
of the grid points using the function
ndctodata. If you like, I will try to create an example using your
data and script as a starting point, and post it back to ncl-talk. If
this is ok with you, let me know and I will send you uploading
instructions.

There have been a number of requests for this sort of functionality
lately. Hopefully we can implement a general solution that does not
require actually creating a plot, but gives the answer directly. We
have the code at the lower level, but need to make it more available
to users.
  -dave

On Jun 30, 2009, at 8:33 AM, Anneliese.Alexander_at_noaa.gov wrote:

> Hi,
>
> No, the satellite file only has one 2-D array in it containing the
> values of the satellite image itself. So it seems NCL knows where to
> put all the pixels in the image, but not how to share that information
> with the user?
>
> Anneliese
>
>
> ----- Original Message -----
> From: Mary Haley <haley_at_ucar.edu>
> Date: Tuesday, June 30, 2009 7:14 am
> Subject: Re: outputting latitudes and longitudes that NCL
> computes
>
>>
>>
>> On Mon, 29 Jun 2009, Anneliese Alexander wrote:
>>
>>> Hi,
>>>
>>> I have a satellite image that I know the corner points of. It
>> is a
>>> Lambert-Conformal image, and I also have the standard latitude
> (just
>>> one, not 2), and standard longitude. Using that information,
>> NCL is
>>> able to plot the image using the "gsn_contour_map" command.
>> However, I
>>> want to know the specific latitudes and longitudes of each point
>> in the
>>> image. Is there a way to get NCL to print out those values or
>> get them
>>> into a data array that I can access?
>>>
>>> Thanks,
>>> Anneliese
>>
>> Anneliese,
>>
>> As I understand your question, this is not possible with NCL.
>>
>> However, is it possible that the file with the satellite image
>> has this information availble, probably as 2D lat/lon arrays
>> on the file?
>>
>> --Mary
>>
>>
>>> --
>>>
>>
> ______________________________________________________________________
> _
>> Anneliese Alexander
> Anneliese.Alexander_at_noaa.gov
>>> CIRES Research Associate 303-497-4296 (office)
>>> NOAA/OAR/ESRL Room DSRC 3B503
>>> 325 Broadway
>>> Boulder, CO 80305
>>>
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>>
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Received on Tue Jun 30 2009 - 11:23:59 MDT