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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You need some extra information, as you can’t do all this from just one precipitation field.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You need to acquire or develop a land/sea mask on the same grid as the precipitation data – you could look around for a land mask from a model, or create one given some other dataset on land/sea distribution (e.g. look at ISLSCP II website, although there are dozens of other possible sources, and you will need something on the same grid as your precip).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Doug<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> gradsusr-bounces@gradsusr.org [mailto:gradsusr-bounces@gradsusr.org] <b>On Behalf Of </b>Farah Ikram<br><b>Sent:</b> 18 July 2012 16:13<br><b>To:</b> gradsusr@gradsusr.org<br><b>Subject:</b> Re: [gradsusr] help required in using "maskout" function in grads<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>i have only one variable of precipitation in the data. how can i make land and sea variables from it to mask the ocean area. plus the variable has positive values in the ocean area aswell<o:p></o:p></p><div><p class=MsoNormal>On Wed, Jul 18, 2012 at 4:59 PM, Farah Ikram <<a href="mailto:farahuni@gmail.com" target="_blank">farahuni@gmail.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal>i am trying to mask the data of sea precipitation in my calculations. please tell me how to use 'maskout" function in for this. <o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div><br />--
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