[gradsusr] Mask out information

[Roger Rodrigues Torres]

Dear Grads Users,
I am trying to mask out some part of my map, outside the Minas Gerais state
in Brazil (see the attached figure). Someone knows how can I do this using
the Minas Gerais state shapefile? Is there another way to do this?
Just emphasizing that I can not remove the data, but just put a layer to
hide that "unnecessary information".
Thanks in advance


Prof. Dr. Roger Rodrigues Torres
Universidade Federal de Itajubá - Unifei
Instituto de Recursos Naturais - IRN
Curriculum Lattes: http://lattes.cnpq.br/5641165392004404
Webpage: http://rtorres.webnode.com.br
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