<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanks Markus.<br><br>I did test with r.mapcalc novo_raster = if"(mi flat_map==0.0234)", but the map is not appropiate. I know the area of value (0.0234), but is not is equal in the novo_raster.<br><br><br>El 13/04/2011, a las 17:27, Markus Neteler escribió:<br><br><blockquote type="cite">2011/4/13 Gaspar Reyes Póndigo <<a href="mailto:gos47@hotmail.com">gos47@hotmail.com</a>>:<br></blockquote><blockquote type="cite"><blockquote type="cite">Hello, Dear grass_user. My first forum participation in the grass_user list<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">email.<br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Welcome!<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">How to extract values of map raster with r.mapcalc? I need make new map<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">raster based on specific value of other raster.<br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Please take a look at the if() conditions:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><a href="http://grass.osgeo.org/grass64/manuals/html64_user/r.mapcalc.html">http://grass.osgeo.org/grass64/manuals/html64_user/r.mapcalc.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Therein is also a section EXAMPLES.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Markus<br></blockquote><blockquote type="cite"><br></blockquote></body></html>