About draw mark command

[hersala]

Dear Eric,

It worked perfectly. Thank you very much for your help.
Best regards.

Hernán

2009/6/10 Eric Altshuler <ela at cola.iges.org>

> You can use the query command to convert from geographic (world)
> coordinates to screen (virtual page) coordinates. First you need to display
> something, for example a variable 'var'.
>
> d var
> q w2xy LON LAT
>
> where (LON,LAT) are the longitude and latitude of the point where you want
> to draw the mark. The output from the 'q w2xy' command will be of the form:
>
> X = xpos  Y = ypos
>
> where (xpos,ypos) are the virtual page coordinates of the point with
> geographic coordinates (LON,LAT). To draw the mark, do:
>
> draw mark MARKTYPE xpos ypos SIZE
>
> See http://grads.iges.org/grads/gadoc/gradcomddrawmark.html for
> documentation on the 'draw mark' command.
>
> Best regards,
>
> Eric L. Altshuler
> Assistant Research Scientist
> Center for Ocean-Land-Atmosphere Studies
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705-3106
> USA
>
> E-mail: ela at cola.iges.org
> Phone: (301) 902-1257
> Fax: (301) 595-9793
>
> ----- Original Message -----
> From: "hersala" <hersala at GMAIL.COM>
> To: GRADSUSR at LIST.CINECA.IT
> Sent: Wednesday, June 10, 2009 2:34:57 PM GMT -05:00 US/Canada Eastern
> Subject: About draw mark command
>
> Hi Gradsusers,
> Has anybody know how to use de *draw mark* command using geographic
> coordinates instead of x and y inches (on the virtual page) as it is set as
> default ?
> Tks in advance !
> Hernán
>
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