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Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Hello Heiko,I've been looking at this issue for a couple of days with the two files provided by Egil Storen (iceconc.nc and iceconc_1.nc). I'm not sure what is going on with Godiva, but I couldn't see much. Using the IDV, I can see the issue of right/left reversal when mapping on the south pole stereographic projection. However, when I use ToolsUI and plot a grid FeatureType, I don't see the issue. The only difference between the two figures given by ToolsUI is the scaling of the map, which I would expect given that one of the files has more information than the other. I do notice, however, that plotting iceconce.nc results in a figure without continental outlines, while iceconc_1.nc does have continental outlines.
I then incorporated your version of StereographicAzimuthalProjection.java into my thredds build, and ran a local catalog serving up the two files. Unfortunately, I saw exactly the same issue when using the IDV to plot the data - right/left reversal and a missing continental outline. ToolsUI was unaffected, and still gave consistent plots of the two files.
Did you observe different behavior when plotting the data in the two files after modifying StereographicAzimuthalProjection.java? If so, do you have a server up that I can inspect? I'm at a little bit of a loss for the moment.
Thanks, Lansing Madry Unidata Boulder, Colorado On 1/28/2013 11:55 AM, Heiko Klein wrote:
Hi,I moved this request to the netcdf-java list, since I can see the problems also in the latest toolsUI. In newer versions (4.3.14) it looks even worth with a different scale (km -> m):in https://github.com/Unidata/thredds/blob/master/cdm/src/main/java/ucar/unidata/geoloc/projection/proj4/StereographicAzimuthalProjection.javaPlease find attached a replacement for above file, fixing both south-pole x-flipping and scale.Heiko On 2013-01-25 16:28, Egil Støren wrote:Dear all, We have a netCDF file containing ice concentrations around antarctica that is available athttp://thredds.met.no/thredds/catalog/egiltest/ES/data/catalog.html?dataset=egiltest/ES/data/iceconc.nc.Using the Godiva2 viewer, it is obvious that the data is displayed inverted along a vertical line centred on the map. This is most easily seen using the south polar stereographic projection. The netCDF file has a variable containing projection info: int Polar_Stereographic_Grid ; Polar_Stereographic_Grid:grid_mapping_name = "polar_stereographic" ; Polar_Stereographic_Grid:straight_vertical_longitude_from_pole = 0.f ;Polar_Stereographic_Grid:latitude_of_projection_origin = -90.f ;Polar_Stereographic_Grid:standard_parallel = -70.f ; Polar_Stereographic_Grid:false_easting = 0.f ; Polar_Stereographic_Grid:false_northing = 0.f ; Polar_Stereographic_Grid:semi_major_axis = 6378273.f ; Polar_Stereographic_Grid:semi_minor_axis = 6356890.f ; Polar_Stereographic_Grid:proj4_string = "+proj=stere +a=6378273 +b=6356889.44891 +lat_0=-90 +lat_ts=-70 +lon_0=0" ; When I removed the following attributes from this variable, the data suddenly displayed correctly in Godiva2: Polar_Stereographic_Grid:semi_major_axis = 6378273.f ; Polar_Stereographic_Grid:semi_minor_axis = 6356890.f ; The modified version can be seen athttp://thredds.met.no/thredds/catalog/egiltest/ES/data/catalog.html?dataset=egiltest/ES/data/iceconc_1.nc.Since these attributes only gives a more exact description of the shape of the earth (compared to not having them), I think there must be a bug somewhere. Have anybody experienced this behaviour? Is this a known bug? We are using thredds version 4.2.9. Best regards, Egil Støren Norwegian Meteorological Institute_______________________________________________ netcdf-java mailing list netcdf-java@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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