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[IDV #LIK-107130]: netcdf 2dlat lon question

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  • Subject: [IDV #LIK-107130]: netcdf 2dlat lon question
  • Date: Thu, 13 May 2010 15:39:01 -0600
> hi Yuan,
> 
> That is my problem I do not know what values I should put there for Alaska.
> 
> Thank you

Elchin,
      I don't what the values are. When you convert the GIS data to the netCDF 
format, you must have a projection file, can you upload to the same site?
Also, is there any reason you pick the lambert conformal projection? I see 
polar stereographic projection is most used in this area.


Yuan
> 
> --El
> 
> On 5/13/10, Unidata IDV Support <address@hidden> wrote:
> >> > hello
> >> > I created netcdf file using fortran.
> >> > here is its structure
> >> >
> > I see the upload file, the one obvious problem is that the projection has a
> > wrong latitude_of_centrol_meridian, the value is "-154.0", I don't think
> > this is make sense to your dataset.
> >
> >
> > Yuan
> >> > perm {
> >> > dimensions:
> >> > y = 1320 ;
> >> > x = 2015 ;
> >> > time = 3 ;
> >> > variables:
> >> > float y(y) ;
> >> > y:units = "km" ;
> >> > y:long_name = "y coordinate of projection" ;
> >> > y:standard_name = "projection_y_coordinate" ;
> >> > float x(x) ;
> >> > x:units = "km" ;
> >> > x:long_name = "x coordinate of projection" ;
> >> > x:standard_name = "projection_x_coordinate" ;
> >> > double lat(x, y) ;
> >> > lat:units = "degrees_north" ;
> >> > double lon(x, y) ;
> >> > lon:units = "degrees_east" ;
> >> > int time(time) ;
> >> > time:units = "1980-08-01T12:00:00Z" ;
> >> > time:long_name = "time" ;
> >> > double temperature(time, y, x) ;
> >> > temperature:units = "celsius" ;
> >> > temperature:long_name = "air temperature" ;
> >> > temperature:missing_value = "-9999." ;
> >> > temperature:grid_mapping = "Lambert_Conformal" ;
> >> > }
> >> > which the number of  GIS files with the following structure.
> >> > ncols         2015
> >> > nrows         1320
> >> > xllcorner     -2301787.7731349
> >> > yllcorner     108069.7858797
> >> > cellsize      2000
> >> > NODATA_value  -9999
> >> >
> >> > I would like to map using IDV or WRF Panoply but their regret to map it.
> >> > I do not know how to handle correctly 2d lats and lons so that I can
> >> > map according to it lats and lons.
> >> > Could you please suggest me any documentation where I can read about
> >> > 2d lat lon mapping?
> >> >
> >> > Thank You.
> >> >
> >> > --El
> >> >
> >> > Research Assistant
> >> > Permafrost Laboratory
> >> > tel: 907 474 7184
> >> > Geophysical Institute
> >> > Univ. of Alaska Fairbanks
> >> >
> >> >
> >> Elchin,
> >> This may be the problem of scaling of different x/y coordinate variables,
> >> could you upload a sample to the following link, so I can try it locally
> >> and find out the exact problem.
> >>
> >> http://motherlode.ucar.edu/repository/alias/idvupload
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: LIK-107130
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> >
> 
> 
> --
> Research Assistant
> Permafrost Laboratory
> tel: 907 474 7184
> Geophysical Institute
> Univ. of Alaska Fairbanks
> 
> 


Ticket Details
===================
Ticket ID: LIK-107130
Department: Support IDV
Priority: Normal
Status: Open