Re: Curvilinear grids and subregions...

[Jonathan Callahan <callahan@xxxxxxxxxxxxx>]

Gary,

I believe you don't even need the SET REGION command at all.  You've
already specified the mid_lon and mid_lat so the region information
isn't needed by the mp_lambert_cyl script.

-- Jon

Gary Strand wrote:
> 
> I've got some data on the PCM POP grid (see http://www.cgd.ucar.edu/pcm for
> more about it) and the necessary grid information for it.
> 
> In what order should I do the following calls to get a subregion (say, the Gulf
> Stream) of that grid properly plotted? I've been stumped for a couple days on
> this!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> use pop_data.nc
> use gridinfo.nc
> !
> let xmin = -90; let xmax =  10
> let ymin =  20; let ymax =  80
> let xdel =  10; let ydel =  10
> let mid_lon = `xmin+(xmax-xmin)/2`
> let mid_lat = `ymin+(ymax-ymin)/2`
> !
> go mp_lambert_cyl `mid_lon` `mid_lat`
> set region/x=`xmin`:`xmax`/y=`ymin`:`ymax`
> let mp_lambda = lon[d=gridinfo.nc] * deg2rad
> let mp_phi    = lat[d=gridinfo.nc] * deg2rad
> set grid `var[d=1],return=grid`
> shade var[d=1]*mp_mask, x_page, y_page
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> 
> The above doesn't work - the "set region" command uses the i,j of the original
> data, which is only "indexical" space, not geographic space.
> 
> I'm hoping I just need to rearrange the order of the calls to get it to work
> right!
> 
> Thanks.
> --
> /\        Gary Strand (303) 497-1336                                NCAR ML262A
>   \_][    www.cgd.ucar.edu/ccr/strandwg                      1850 Table Mesa Dr
>       \___strandwg@ucar.edu                       Boulder, Colorado, USA  80305