[ncl-talk] Trouble plotting 2D lat/lon data from NSIDC

[Rick Brownrigg]

Hi,

Are you having trouble georeferencing the plot, or not getting any sort of
plot at all.  From the printVarSummary, it looks like the x/y coordinates
are in meters on the ground, relative to some polar stereographic
cartographic projection. Is there any sort of other metadata describing the
projection?  If you are able to share the file, I can to take a look.
Otherwise, what is the output of a print-statement on the file-variable
that reads this grid?

Rick

On Mon, Oct 23, 2017 at 9:27 AM, Anne <anne.seidenglanz at unive.it> wrote:

> Hello everybody,
>
> I have a problem plotting data that have 2D latitude/longitude dimensions
> (in particular monthly sea ice concentration in the Arctic from the NSIDC,
> National Snow and Ice Data Center), even though I have used the
>
> res at sfXArray = lon2d
> res at sfYArray = lat2d
>
> resources as I have done earlier for another case (traingular ocean grid)
> which worked fine, however not so in this case.This is the information I
> got about the grid:
> "The grid is in the NSIDC Sea Ice Polar Stereographic [North/South]
> projection. This is an irregular grid in that the latitude and longitude
> are 2-dimensional arrays, where the x and the y component are specified by
> xgrid and ygrid component (see below)"
>
> This is part of the the printVarSummary of the variable:
>
> Variable:* seaice_conc_monthly_cdr*
> Type: byte
> Total Size: 46441472 bytes
>             46441472 values
> Number of Dimensions: 3
> Dimensions and sizes: [time | 341] x *[ygrid | 448]* x *[xgrid | 304]*
> Coordinates:
>             time: [141195..151544]
>           *  ygrid: [5837500..-5337500]*
> *            xgrid: [-3837500..3737500]*
> Number Of Attributes: 14
> ...
>
>
> I managed to convert time into a useful date using the cd_calender
> function, but was not successful with the latitude and longitude (neither
> with ascribing explicitly latitude and longitude to the 2nd and 3rd
> coordinate dimension, respectively).
>
> Did I overlook something?
>
> Thanks in advance,
> Anne
>
>
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20171023/2f92126e/attachment.html>