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<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Try with ‘g.findfile element=cell file=<your_raster_name>’
in a Perl pipe. If the module returns a series of empty strings, your raster
does not exist. I used it in Python in a way like this:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>if os.popen(‘g.findfile element=cell file=%s’ % <raster_name>,’r’).readlines()[0][:-1].split(‘=’)[1]:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> <the raster exists><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>else:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> <the raster does not exist><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>although you use Perl I suppose it will be similar (I hope).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Jose A.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
grassuser-bounces@grass.itc.it [mailto:grassuser-bounces@grass.itc.it] <b>En
nombre de </b>M S<br>
<b>Enviado el:</b> martes, 14 de agosto de 2007 18:42<br>
<b>Para:</b> GRASS user list<br>
<b>Asunto:</b> [POSIBLESPAM]: [GRASS-user] test if raster/vector exists (in
Perl)<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a Perl program that loops through the r.lake module,
and captures output. In the program, there are a few instances where I
would like to test if a given raster already exists. In perl, its
something like this to test if a file exists ... if (-e "filename") {
do stuff }.<br>
<br>
is there a way to use this feature against a raster? Otherwise, I was
going to do something like <a href="http://r.info">r.info</a> and pipe the
output to a file. then search that the file for some keyword indicating
it exists or doesnt exist.<br>
<br>
any other ideas or approaches?<br>
<br>
<br>
thanks,<br>
Mark<o:p></o:p></p>
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