Johannes,<div>thank you very much, that was all i needed. so simple, i appreciate the explanation!</div><div>thanx,</div><div>Janet<br><br><div class="gmail_quote">On Wed, Mar 14, 2012 at 1:12 AM, Johannes Radinger <span dir="ltr"><<a href="mailto:jradinger@gmx.at">jradinger@gmx.at</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Janet,<div><br></div><div>if you choose "use=attr" then the value of the</div>
<div>attribute you set with "column=xxx" is used</div><div>as the value for the raster pixel. You can check</div><div>your attribute table to find out which attribute values</div><div>are assign to each road section.</div>
<div><br></div><div>If you just want a "fix value" for each raster pixel of the road,</div><div> you have to set "use=val" and then</div><div>provide a value you want (value=xxx).</div><div><br></div><div>
So it depends what you're looking for. Which values</div><div>do you want to be assigned to you road-pixel in the raster format?</div><div><br></div><div>best regards,</div><div>Johannes</div><div><br></div><div><div>
<div>Am 14.03.2012 um 07:29 schrieb Janet Choate:</div><br><blockquote type="cite"><div><div class="h5">Hi users,<div>i've read the help and other posts regarding v.to.rast, but i'm still not piecing it all together and would appreciate some help.</div>
<div>i have a vector map of roads that i want to convert to a raster, so it is lines. v.support - fine, but i can not figure out what i need to do with v.digit (and if v.digit is necessary), don't know how to use. after running v.support, if i just run v.to.rast as:</div>
<div><div><br></div><div>v.to.rast input=roads output=roads</div><div>ERROR: Column parameter missing (or use value parameter)</div></div><div><br></div><div>but if i run as:</div><div>v.to.rast input=roads output=roads5 use=attr column=ROADNR<br>
</div><div>(or column=CODE, etc..)</div><div><br></div><div>then i get a raster. values of the raster differ based on what column i choose. so my question is, how do i choose the column, and how do i know what to set use= to (<em style="font-size:medium;font-family:Times">attr,cat,val,z,dir)</em></div>
<div><em style="font-size:medium;font-family:Times"><br></em></div><div><span style="font-size:medium;font-family:Times">running db.describe on the road vector, i get the following info:</span></div>
<div><span style="font-size:medium;font-family:Times"><div>db.describe -c table=roads</div><div>ncols: 14</div><div>nrows: 383</div><div>Column 1: cat:INTEGER:11</div><div>Column 2: UserId:INTEGER:11</div>
<div>Column 3: FNODE_:INTEGER:11</div><div>Column 4: TNODE_:INTEGER:11</div><div>Column 5: LPOLY_:INTEGER:11</div><div>Column 6: RPOLY_:INTEGER:11</div><div>Column 7: LENGTH:DOUBLE PRECISION:20</div><div>Column 8: GI00701_:INTEGER:11</div>
<div>Column 9: GI00701_ID:INTEGER:11</div><div>Column 10: YEAR:INTEGER:11</div><div>Column 11: ROADDEC:INTEGER:11</div><div>Column 12: CODE:INTEGER:11</div><div>Column 13: STAT:CHARACTER:1</div><div>Column 14: ROADNR:INTEGER:11</div>
<div><br></div><div>if anyone can please advise the process of turning a vector into a raster, i.e. what commands are necessary first and how to apply them, i would really appreciate it.</div><div>thank you, </div><div>Janet</div>
<div><br></div></span></div><div><br></div></div></div>
_______________________________________________<br>grass-user mailing list<br><a href="mailto:grass-user@lists.osgeo.org" target="_blank">grass-user@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/mailman/listinfo/grass-user" target="_blank">http://lists.osgeo.org/mailman/listinfo/grass-user</a><br>
</blockquote></div><br></div></div></blockquote></div><br></div>