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

[zoe jacobs]

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and opening it by Panoply , it is no longer valid as a nc file !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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