[ncl-talk] How to convert a contour map to a raster file from a nc file?

[zoe jacobs]

Dear Dave and Dennise,
Thanks for your email, the exact error from panoply is attached.
Dave, I just saw your email, I will do what you have suggested shortly .
Many thanks,
Best wishes,

On Thu, Jun 11, 2020 at 1:20 AM Dennis Shea <shea at ucar.edu> wrote:

>
>
> re: "my nc file is just known by the remote server I work at. After
> copying the file to my desktop, and opening it by Panoply , it is no longer
> valid as a nc file"
>
> This is  "no longer valid as a nc file" does not make sense to me. Are you
> sure it was netCDF [eg: .nc, .nc4, ... extension]
>
>
>
>
>
>
>
>
>
> On Wed, Jun 10, 2020 at 10:45 AM zoe jacobs via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Dear Dave,
>> Many thanks for your explanations. My problem is that my nc file is just
>> known by the remote server I work at. After copying the file to my desktop,
>> and opening it by Panoply , it is no longer valid as a nc file ! . So I
>> look for a way to sort it out. What can I do please?
>> Many thanks in advance,
>> Best wishes,
>>
>> On Tue, Jun 9, 2020 at 10:19 PM Dave Allured - NOAA Affiliate <
>> dave.allured at noaa.gov> wrote:
>>
>>> According to this article, your original Netcdf file is already in a GIS
>>> raster format.
>>>
>>>     https://en.wikipedia.org/wiki/GIS_file_formats
>>>
>>> You should be able to skip the plotting step, and use the Netcdf file
>>> directly in ArcGIS.  Minor adjustments may be needed for coordinates and
>>> area subsetting.  My guess is that this is really what you want to do.
>>>
>>> The expression "raster format" is problematical because it is used for
>>> at least three fundamentally different things in computer graphics.
>>> Generically, this refers to common "bit-mapped" image file formats such as
>>> png, gif, and jpeg.  In GIS and satellite imagery, it refers to a variety
>>> of gridded data formats, including Netcdf.  And NCL has a specialized
>>> usage, referring to the rendering of gridded data as visibly rectangular
>>> blocks when making plots, rather than smooth or segmented outlines.  It
>>> would be nice if these nuances of terminology were discussed in NCL
>>> documentation, but, um, they are not.
>>>
>>> To make things more confusing, some of these formats can be "rendered"
>>> in one of the other formats, often losing software compatibility in the
>>> process.  The picture on your example raster_4.ncl is a perfect example of
>>> this.  That is an NCL "raster plot" projected onto a PNG "raster format"
>>> image file for website display.  The "pixels" before and after are
>>> completely different.  So be careful about which usage you are discussing.
>>>
>>>
>>> On Tue, Jun 9, 2020 at 10:06 AM zoe jacobs via ncl-talk <
>>> ncl-talk at mailman.ucar.edu> wrote:
>>>
>>>> Dear all NCL users,
>>>>
>>>> I would like to create a map plot in raster format from a nc file . So
>>>> I can then use it on ArcGIS. Please have a look at the following link
>>>> https://www.ncl.ucar.edu/Applications/raster.shtml , example
>>>> easter_4.ncl . I already could plot a contour map from my nc file, and
>>>> I just wonder which command should I add to my script to convert my plot to
>>>> be in a raster format?
>>>> Would you please kindly advise me in this regard?
>>>> Best wishes,
>>>>
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