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Re: drawing a rectangle on a 2D map
Hi,
Andrew suggested a good method with polygon command. You can also
plot the rectangle by using the "box.jnl" distributed with ferret
(check in your ferret/go directory).
Usage : GO box xlo xhi ylo yhi [pen_number]
Here is an example:
yes? use coads_climatology
yes? fill/x=100:300/y=-50:50/l=1 sst ! base plot
yes? go box 180,220,-10,10,7 ! red thick rectangle
yes? go box 170,230,-15,15,9 ! green thick rectangle
Hope this helps
With Regards
Jaison
On Wed, 13 Oct 2004, Andrew Wittenberg wrote:
> On 13 Oct 2004, Vincent Le Fouest wrote:
> > I did a 2D map using etopo2.cdf. Now, I would like to overlay on this
> > georeferenced map a rectangle delimited by four couples of coordinates
> > to delimit a particular area. Is there a way to do it?
>
> Hi Vincent,
>
> The following overlays a red rectangle with a black border between
> x=150:180 and y=-20:20.
>
> poly/ov/nolab/pal=red/line=1 {150,180,180,150,150}, {-20,-20,20,20,-20}
>
> The two {braces} are sequences of x- and y-coordinates. Drop the "line=1"
> for no border, or drop the "pal=red" for a transparent rectangle.
>
> Cheers,
>
> Andrew
>
>
--
___________________________________________________
Jaison Kurian
Centre for Atmospheric and Oceanic Sciences
Indian Institute of Science
B A N G A L O R E 560 012
Ph: +91-80-3942505
+91-80-3600450
Fax:+91-80-3600865
___________________________________________________
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