[ncl-talk] Issue with shapefile highways showing up on map

[Dave Allured - NOAA Affiliate]

This might be a known issue, swapped X and Y coordinates in the shapefile
reader.  Verify by changing your plot region, and see if the features show
up in a different place on the globe.  The alternate location is
predictable.
https://github.com/NCAR/ncl/issues/176

This was never fully investigated.  This may be due to a version update in
one of the support libraries, such as GDAL, on your new machine.  There is
a suggested workaround in that issue.


On Sun, Aug 20, 2023 at 3:30 PM Andrew Kren - NOAA Federal via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi there,
>
> For some reason I am running into issues with my highways not showing up
> when trying to plot them. As a context, we moved the scripts to a new
> computer. The old computer has the same code and it worked fine. Now when
> we installed NCL on the new machine, the script runs but does not plot the
> polylines.
>
> I have been using gsn_add_shapefile_polylines_subset to plot a select
> number of highways. I verified that the function is reading correctly, and
> there are no error messages showing up when running NCL. I am at a loss for
> what could be going on. Here is a snippet of my code where I plot the
> highways:
>
>  if (plot_highways.eq."Yes".or.plot_highways.eq."yes") then
>       ; add highways
>       ;---Section to add polylines to map.
>       plres_high             = True           ; resource list for polylines
>       colors_hwy = highway_colors
>       ;plres at gsLineColor = "(/0.66, 0.66, 0.66/)"
>        plres at gsEdgesOn = True
>        plres at gsFillColor = "transparent"
>        plres at gsFillOpacityF = 0.0
>       plres_high at gsLineThicknessF = 2.0
>       highways = highway_names
>       poly_high =
> gsn_add_shapefile_polylines_subset(wks,plot,SHAPE_DIR+shapefile_file,shapefile_descriptor,highways,colors_hwy,plres_high)
>       end if
>
> Could this be a path issue with where NCL was installed? I can't imagine
> it would be since it runs fine. Much appreciated for any help!
> --
>
> Andrew Kren
> Meteorologist
> NOAA's National Weather Service
> Raleigh Forecast Office
> 1005 Capability Drive, Suite 300
> Raleigh, North Carolina 27606
> voice: 919-326-1035
> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>
>
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