Re: adding properties to a map

Frank,

See my comments interspersed.

On Apr 29, 2014, at 1:29 AM, Kreienkamp Frank <Frank.Kreienkamp@dwd.de> wrote:

> Hello,
>
> based on my understanding of ncl features I have created the attached map. Currently I fail to add certain features.
>
> I have marked the needed features in the map with red arrows.
>
> This includes
> - a wish for 2 lines of a title including the possibility to change the font size and the position (left side assignment)

See example "text_9.ncl" at:

http://www.ncl.ucar.edu/Applications/text.shtml

This shows how to add strings outside a plot. You can add two strings on the left, but you will need to adjust the "amOrthogonalPosF" resource as described in this example.

> - a added unit beside the colour scale

I don't think there's a way to add a unit in the exact location you're indicating, but you can add a labelbar title, and then move it right or left using pmLabelBarOrthogonalPosF.
See example "lb_3.ncl" at:

http://www.ncl.ucar.edu/Applications/labelbar.shtml

> - the removal of not needed colour parts on both sides of the colour scale

When you create contours with NCL, the default is that you will always get one more color box than you have contour levels, because NCL is giving you color boxes that show values above and below the min/max contour levels.

If you don't want these extra boxes, then you need to select two fewer contour levels. If you also want the end labelbar boxes labeled, then you will need to set

   res@lbLabelAlignment = "ExternalEdges"
   res@lbLabelStrings = (/...array of label strings.../)
 
See example lb_14.ncl at:

http://www.ncl.ucar.edu/Applications/labelbar.shtml#ex14

> - the possibility to add several lines at a position like the indicated by the top-down-arrow on the right bottom corner

Do you mean lines of text, or just lines?

You can see gsn_text_ndc and gsn_polyline_ndc for ways to add lines using NDC coordinates. NDC coordinates are coordinates in a unit square, and hence go from 0 to 1 inclusive. These are what you need to use when adding text, lines, markers, etc, that fall outside a plot's boundaries.

See the examples at:

http://www.ncl.ucar.edu/Applications/polyg.shtml

>
> A additional question is, how to create not erratic looking grid boxes of a raster based data set in a stereographic projection (the data are not in the same projection).

I'm not sure what you mean by "erratic", but perhaps you want:

   res@cnRasterSmoothingOn = True

For more raster examples, see:

http://www.ncl.ucar.edu/Applications/raster.shtml

--Mary

>
> Thanks for help in advance
> Frank
>
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Received on Tue Apr 29 08:58:25 2014