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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Tod.... Something strikes me as odd: GeoX is defined as a dimension of 500. But then declared as a variable with a shape of "pixels". To follow CF conventions, I think you want to declare it as: int GeoX(GeoX); so that it is a "coordinate variable" (in Sect 5.2 of the CF conventions - see <http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.3/ch05s02.html>). You might also need a "coordinates" attribute for your 2D fields so that they know to use lat_g and lon_g. It's a little hard to interpret this automatically since two variables that apparently contain latitude values are in the file. I note that netcdf tools does not find any coordinate system or grids in the file -- probably mostly due to the lack of being able to find geo-locations. ....but I'm sure Don can help better than I. tom On Tue, Aug 12, 2008 at 2:29 PM, Tod Hagan <tod@xxxxxxxxxxxxxxx> wrote: > All, > > Two questions: > > First, regarding > http://eclipse.ncdc.noaa.gov:9090/thredds/nfdownload/iscpp-dx/2006/ISCCP.DX.0.GOE-10.2006.04.02.1800.CSU > > Is it possible to open this file with IDV? None of the options seem to > work. It's a netCDF file; ncview's display of its 2D fields look > reasonable. > > According to the global attributes it's formatted following "CF-1.0" > conventions. Here's an excerpt from the start of 'ncdump -c' output: > > dimensions: > pixel = 94379 ; > GeoX = 500 ; > GeoY = 550 ; > variables: > int pixel(pixel) ; > pixel:long_name = "Pixel Number" ; > int lat(pixel) ; > lat:long_name = "Latitude" ; > lat:units = "degrees_north" ; > lat:scale_factor = 0.1f ; > lat:add_offset = -90.f ; > int lon(pixel) ; > lon:long_name = "Longitude" ; > lon:units = "degrees_east" ; > lon:scale_factor = 0.1f ; > int GeoX(pixel) ; > GeoX:long_name = "X Position" ; > GeoX:_CoordinateAxisType = "GeoX" ; > int GeoY(pixel) ; > GeoY:long_name = "Y Position" ; > GeoY:_CoordinateAxisType = "GeoY" ; > int gxpos(GeoX, GeoY) ; > gxpos:long_name = "X Position" ; > int gypos(GeoX, GeoY) ; > gypos:long_name = "Y Position" ; > int lat_g(GeoX, GeoY) ; > lat_g:long_name = "Latitude" ; > lat_g:units = "degrees_north" ; > lat_g:scale_factor = 0.1f ; > lat_g:add_offset = -90.f ; > int lon_g(GeoX, GeoY) ; > lon_g:long_name = "Longitude" ; > lon_g:units = "degrees_east" ; > lon_g:scale_factor = 0.1f ; > > Second, browsing THREDDS catalogs is hampered by the number of parse > errors that are encountered, using both versions 2.3 and 2.5 of IDV. A > couple of examples: > > Expanding xlink > node:http://lead.unidata.ucar.edu:8080/thredds/topcatalog.html > Error parsing xml: > http://lead.unidata.ucar.edu:8080/thredds/topcatalog.html > The declaration for the entity "HTML.Version" must > end with '>'. > The declaration for the entity "HTML.Version" must > end with '>'. line:31 column:3 > > Creating > ui:http://eclipse.ncdc.noaa.gov:9090/thredds/catalog/iscpp-dx/catalog.html > Error parsing xml: The declaration for the entity "HTML.Version" > must end with '>'. > The declaration for the entity "HTML.Version" must > end with '>'. line:31 column:3 > > Has anyone else seen this? Is it a problem with IDV or TDS? Apparently > the THREDDS catalog validator that used to be available has disappeared. > > Thanks. > > Tod > > -- > Tod Hagan > Information Technologist > AIRMAP/Climate Change Research Center > Institute for the Study of Earth, Oceans, and Space > University of New Hampshire > Durham, NH 03824 > Phone: 603-862-3116 > > > _______________________________________________ > idvusers mailing list > idvusers@xxxxxxxxxxxxxxxx > For list information, to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > -- Tom Whittaker University of Wisconsin-Madison Space Science & Engineering Center (SSEC) Cooperative Institute for Meteorological Satellite Studies (CIMSS) 1225 W. Dayton Street Madison, WI 53706 USA ph: +1 608 262 2759
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