[ncl-talk] [ncl-install] Issue with ploting shapefile

[Ehsan Taghizadeh]

Dear Dave,Thank you for your helpful reply.

First, I should mention the GDAL version on our server:
$ ogrinfo –versionGDAL 3.9.2, released 2024/08/13
Additionally, the NCL version installed by Conda on our server appears to be "h7cb714c_54". I tried to find the versions h8482486_9, h9ce15c7_1, or h7290063_6 mentioned as working well in issue #56, but I couldn't locate them in the build details from conda-forge.

It seems some shapefiles work well with the default NCL version from Conda. For instance, gadm41_CAN_shp falls into this category. However, some shapefiles do not work with the default NCL in Conda. For example, "englandshp" (attached file) does not work well with the default NCL in Conda.

When I replaced $NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl with the one mentioned in issue #176, the situation changed. The "englandshp" worked well with the new gsn_code, but for gadm41_CAN_shp, the following error was displayed:

(0)     shapefile_order_lat_lon: Error: Cannot parse.(0)       Unexpected output from 'ogrinfo -al $shapefile'....(0)       Assume order of coordinates = lon/lat.(0)(0)     Diagnostics 1 for 'ogrinfo':GDAL 3.9.2, released 2024/08/13(0)(0)     Diagnostics 2 for 'ogrinfo':...(0)     Diagnostics 3 for 'ogrinfo':(0)     Parse results = False missing False False False False(0)     Number of lines in result = 1(0)     missing(0)     ----------------------------(0)       Assume order of coordinates = lon/lat.(0)     --- Working on time 2019020106 ---(0)     shapefile_order_lat_lon: Error: Cannot parse.(0)       Unexpected output from 'ogrinfo -al $shapefile'.
However, when I tried to run the simple NCL script from the NCL website to plot them, nothing was displayed for both shapefiles with the new gsn_code.

load "./shapefile_utils.ncl"
sname = "your_shapefile.shp"
print_shapefile_info(sname)
plot_shapefile(sname)
For the "englandshp", nothing was displayed. For the CAN shapefile, nothing was displayed, and the following error occurred:
(0)     Diagnostics 3 for 'ogrinfo':(0)     Parse results = False missing False False False False(0)     Number of lines in result = 1(0)     missing(0)     ----------------------------(0)       Assume order of coordinates = lon/lat.
In summary, it seems that for some shape files, we should use the default gsn_code.ncl, while for others, we should use your gsn_code.ncl. This is my understanding. I would appreciate your thoughts on this.

----------------------------------------------------------------------------- Best regards,Ehsan Taghizade 

    On Sunday, December 29, 2024 at 02:17:40 PM PST, Dave Allured - NOAA Affiliate <dave.allured at noaa.gov> wrote:  
 
 Ehsan, this is a known issue with recent NCL versions.  The lat and lon coordinates are swapped in some shape files, causing missing images, or mirror images along a 45 degree fold line.  That is what I see in your plots.
This is discussed in Github issues #151 and #176.  In #176 I show a diagnostic method to determine swapped coordinates.  I also provide a modified NCL library file that should render plots correctly for any shape file.  Please give these suggestions a try, and let us know the results.

On Wed, Dec 25, 2024 at 7:23 AM Ehsan Taghizadeh via ncl-install <ncl-install at mailman.ucar.edu> wrote:

Hello everyone,
I am trying to add a shapefile to my plot, but the location of the shapefile is incorrect as it appears to be rotated 90 degrees clockwise. Previously, I had an issue with NCL installed via Conda. I attempted to install NCL using a precompiled version, but encountered the following error: “ncl: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or directory.” Since I do not have root access, I cannot install libssl.so.10.
Attached are the incorrect and correct output maps. The desired shapefile is shown in tan. The correct version is the output from running NCL on another Linux version (Rocky), which I do not have access to. The code I used to plot these maps is quite long and may not be helpful for this issue, but I can provide a shorter version if necessary.
As I am unsure if this issue is directly related to the NCL installation, I am sending this to both emails. Apologies for any inconvenience caused.
The output of the command "conda list -n ncl_stable" is attached (condalist.txt). Some additional information is provided below:$ conda --version   conda 24.11.2$ which ncl   ~/miniconda3/envs/ncl_stable/bin/ncl$ ncl -V   6.6.2
$ env  | grep NCARG   NCARG_ROOT=/home/taghizade/miniconda3/envs/ncl_stable
Any help would be appreciated. Happy holidays!----------------------------------------------------------------------------- Best regards,Ehsan Taghizade
  
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