[ncl-talk] mask ocean areas: SOLVED

Sri Nandini snandini at marum.de
Tue Mar 6 06:33:05 MST 2018


Thank you its solved!!!


I was using wrong plotting resource attributes.











On Mar 6, 2018 2:22:11 PM, Karin Meier-Fleischer wrote:

> 
    Hi Sri,
> 
> 
    the landsea.nc mask file is OK. If your data is on a 1x1 deg grid
    too than it should look like the attached plot. Maybe you have to
    regrid your data to the same 1x1 deg grid.
> 
> 
    If you want to generate mask files yourself for different grids you
    can use the CDOs. 
> 
    E.g. mask ocean 1x1 deg (r360x180):
> 
>   cdo -f nc -expr,'topo = ((topo >
        0.0)) ? 1.0 : 0.0' -remapycon,r360x180 -topo
        mask_the_ocean_1x1deg.nc
> 
> 
    -Karin
> 
> Am 06.03.18 um 13:21 schrieb Sri
      Nandini:
> 
    > > 
      
> > 
      Hello
> > 
> > 
      Here i attach a plot using the same method as in mask_5.ncl
      example==>HOWEVER, the landsea.nc mask is quite coarse and
      covers large grid points.
> > 
      Is there a landsea mask available for 1x1 resolution?
> > 
> > 
> > 
> > 
> > 
> > 
> > 
      On Mar 5, 2018 11:06:13 PM, Dennis Shea wrote:
      
> > > 
        > > > 
          > > > 
            > > > 
              > > > Further ....
> > > 
> > > 
              NCL is distributed with a simple 1x1 global mask. This may
              be adequate for your needs.
> > > 
> > > https://www.ncl.ucar.edu/Applications/mask.shtml
> > > 
            > > > Example 5
> > > 
> > > 
              ----
> > > 
            
> > > https://www.ncl.ucar.edu/Document/Functions/Shea_util/landsea_mask.shtml
> > > 
> > > 
            The function indicates that multiple libraries must be
            loaded. 
> > > 
            However, if you have 6.2.0 onward these libraries are
            automatically loaded.
> > > 
> > > 
            ---
> > > 
          Good luck
> > > 
        
> > > On Mon, Mar 5, 2018 at 1:58 PM, Adam
            Phillips > > > <> > > asphilli at ucar.edu> > > >> > > 
            wrote:
> > > > 
              > > > > 
                > > > > Hi Sri,
> > > > > > > > 
                To add to Mary's reply you can also tell NCL to color
                fill the ocean basins last, thereby applying a graphical
                mask. 
                > > > > Example:
> > > > res at mpFillOn = True
> > > > > > > > 
                  > > > > res at mpFillColors = (/-1,0,-1,-1/)   ; set ocean
                    to white, see: > > > > http://www.ncl.ucar.edu/Document/Graphics/Resources/mp.shtml#mpFillColors
> > > > > > > > 
                  > > > > res at mpFillDrawOrder = "PostDraw"   ; do the map
                    fill 
> > > > 
                > > > > 
                > > > > 
                  > > > > res at mpPerimDrawOrder = "PostDraw"   ; and
                    perimeter draw last
> > > > > > > > 
                  > > > > res at mpOutlineDrawOrder = "Draw"        ; draw the
                    map outlines second
> > > > > > > > 
                  > > > > res at cnFillDrawOrder = "PreDraw"          ; draw
                    the color-filled contours first
> > > > > > > > 
                
> > > > > > > > 
                
> > > > 
                > > > > Adam 
> > > > 
              
> > > > > > > > 
              > > > > 
                > > > > 
                  
> > > > On Mon, Mar 5, 2018 at 1:06
                      PM, Mary Haley > > > > <> > > > haley at ucar.edu> > > > >> > > > 
                      wrote:
> > > > > 
                        > > > > > 
                          > > > > > Hi,
> > > > > > > > > > 
                          
> > > > > 
                          > > > > > Please see our
                            masking examples at:
> > > > > > > > > > 
                          
> > > > > 
                          > > > > > http://www.ncl.ucar.edu/Applications/mask.shtml
> > > > > 
                          
> > > > > 
                          > > > > > In particular, you
                            may want to look at example mask_5.ncl which
                            uses the landsea_mask function, or example
                            mask_12.ncl which uses a shapefile to do the
                            masking.
> > > > > > > > > > 
                          
> > > > > 
                          > > > > > --Mary
> > > > > > > > > > 
                          
> > > > > 
                        
> > > > > > > > > > 
                        
> > > > > On Mon, Mar 5, 2018
                            at 9:50 AM, Sri Nandini > > > > > <> > > > > snandini at marum.de> > > > > >> > > > > 
                            wrote:
> > > > > > 
                              > > > > > > Hello
> > > > > > 
> > > > > > 
                                I am trying to mask out ocean areas in
                                my plot. 
> > > > > > 
                                Could someone please help me out with
                                this? Is there mask data i can download
                                from NCL?
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
                              
> > > > > > 
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> > > > 
                  > > > > 
                
> > > > > > > > 
                > > > > -- 
> > > > 
                > > > > 
                  > > > > 
                    > > > > 
                      > > > > 
                        > > > > 
                          > > > > 
                            > > > > 
                              > > > > 
                                > > > > 
                                  > > > > 
                                    > > > > Adam
                                          Phillips 

> > > > > > > > 
                                    > > > > Associate
                                        Scientist,  > > > > Climate
                                        and Global Dynamics Laboratory,
                                        NCAR

> > > > > > > > 
                                
> > > > > > > > 
                                > > > > www.cgd.ucar.edu/staff/asphilli/> > > >   
                                    > > > > 303-497-1726> > > > 
                                    
> > > > > > > > 
                                > > > > 
                                > > > > 
                                  
> > > > 
                                    
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