Re: [visad] How to use the Lambert Conformal Conic Projection

• To: "Wang Lizhi" <wlz@xxxxxxxxx>
• Subject: Re: [visad] How to use the Lambert Conformal Conic Projection
• From: "Tom Whittaker" <whittaker@xxxxxxxx>
• Date: Sun, 18 Nov 2007 22:10:34 -0600

LIzhi --

What parameters are giving you difficulty?  The constuctor signature is:

  public LambertConformalConic( RealTupleType reference,  //- earth Reference
                                double r_major,           //- semimajor axis
                                double r_minor,           //- semiminor axis
                                double s_lat1,            //- 1st
standard latitude
                                double s_lat2,            //- 2nd
standard latitude
                                double lon_center,        //-
longitude of grid origin
                                double lat_center,        //- latitude
of grid origin
                                double false_easting,     //- x offset
                                double false_northing     //- y offset
                                                        )
Depending on how you want to describe your projection, you might also
want to look at the class:
visad.jmet.GRIBCoordinateSystem which contains some "short-cuts" for
some of the more common
GRIB coordinate systems.

Best regards,

tom
On Nov 17, 2007 4:56 AM, Wang Lizhi <wlz@xxxxxxxxx> wrote:
> Dear all,
>
> I want to use visad to display the MM5's output with the Lambert conformal 
> conic projection. But I can not find enough information about the 
> CoordinateSystem (LambertConformalConic) and the meaning of the parameters.
>
> What I want to do is :
> float[nz][ny][nx] is the mm5's output, ny and nx is the grid size(60km), with 
> center point at LAT, LON. I want to display the 3D data with Lambert 
> Conformal conic projection. Could you help me or give me a example code about 
> this case?
>
> thanks,
>
> lizhi
>
> ##########################################################################
>
>   WANG Lizhi
>
>   Key Laboratory of Regional Climate-Environment for East Asia,
>   START/RRC Temperate East Asia, Institute of
>   Atmospheric Physics, Chinese Academy of Sciences
>
>   Tel(O)  :  86-10-82995140
>   Fax(O)  :  86-10-82995135
>   E-mail  :  wlz@xxxxxxxxx
>   Address :  P.O.Box 9804,Beijing 100029,  P.R.China
> ##########################################################################
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-- 
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

• References:
  • [visad] How to use the Lambert Conformal Conic Projection
    • From: Wang Lizhi