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  Hi Juan -

I have done this for a rotated mercator projection.  (Jonathan Callahan
helped me through this problem when I first started up on ferret.)  The
procedure was fairly straight forward.

I am not sure what map projection you use.  (I think non equidistant
lat-lon projection is not a specific projection.)  But regardless of the
projection, the procedure should be somewhat straight forward.

There are two or more ways you can do this:

(1) The first and easiest is using the 3-argument SHADE, FILL, or CONTOUR
command, as follows:

   shade my_data, x_page, y_page

where x_page and y_page are the latitude and longitude descriptions of
each data point.  This should plot your data on a standard lat-lon
grid.  Form there, you can run GO LAND.  See
for more information.

(2) Now if you want to get fancier, you can also have ferret plot the
country and land/sea borders on top of your data.  This procedure is a bit
more complicated.  The nice thing about this method is that portion of the
map that falls outside of your domain is not plotted.  If you are 
interested method, I am help you through it.  Also, see mp_demo.jnl for a

(3) You could probably interpolate your data onto a lat-lon grid.  This
may be useful for some purposes (e.g. comparing your model to observations
which are supplied on a lat-lon grid.).  It should also be fairly easy to
implement, but I do not know how to do it.

Let me know if you have any further questions.

  - Jeremy

On Wed, 24 Nov 1999, Juan Antonio Prego wrote:

>     Dear ferreters?
>     Any experience using go land for non equidistant lat-lon projections?
>     Ferret is confused and thinks that X and Y axis are longitude and latitude,
> but they are not, since x=i=1:50 and y=j=1:51. The output is from a REGIONAL model,
> any experience with that?
>     Any suggestion about how to change land.jnl script for non equidistant lat-lon
> projections?
>     Any help would be greatly appreciated.
>     Juan

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