<HTML><BODY DEFANGED_STYLE="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">I figured out how to set up attribute data for a point layer in a mysql database. Very handy because I can now select points for display based on attributes (population > n, type like "whatever", etc.) However, now I want to perform operations on those data based on the same select criteria. For example, I want to create buffer vector layer from just some of the points in that point layer. There does not appear to be any way to do this in GRASS. I would have to create a copy of the layer or a new layer that contains a subset of the points. This seems like such a obviously useful feature that if there is no way to currently do this, I'd like to suggest that it be considered in GRASS's development. After all, what's point in having the wonderful capability of selecting geometry with a database query if all you can do with it is display it?<DIV><BR class="khtml-block-placeholder"></DIV><DIV>Just my 2 cents.</DIV><BR><BR><DIV> <P DEFANGED_STYLE="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" DEFANGED_STYLE="font: 12.0px Helvetica">Jason Horn</FONT></P> <P DEFANGED_STYLE="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" DEFANGED_STYLE="font: 12.0px Helvetica">Boston University Department of Biology</FONT></P> <P style="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" DEFANGED_STYLE="font: 12.0px Helvetica">5 Cumington Street<SPAN class="Apple-converted-space"> </SPAN>Boston, MA 02215</FONT></P> <P DEFANGED_STYLE="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><BR></P> <P DEFANGED_STYLE="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" DEFANGED_STYLE="font: 12.0px Helvetica"><A href="mailto:jhorn@bu.edu">jhorn@bu.edu</A></FONT></P> <P DEFANGED_STYLE="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">office: 617 353 6987</FONT></P> <P DEFANGED_STYLE="margin: 0.0px 0.0px 0.0px 0.0px"><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">cell: 401 588 2766</FONT></P> <BR class="Apple-interchange-newline"> </DIV><BR></BODY></HTML>