Success! Thanks for making this easy for the total noob that I am.<br><br><div class="gmail_quote">On Thu, Jun 30, 2011 at 11:04 AM, Markus Metz <span dir="ltr"><<a href="mailto:markus.metz.giswork@googlemail.com">markus.metz.giswork@googlemail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">On Thu, Jun 30, 2011 at 4:47 PM, Christian Guirreri<br>
<<a href="mailto:christian@guirreri.com">christian@guirreri.com</a>> wrote:<br>
> I'm on GRASS 6.4.1. QGIS 1.7.0<br>
><br>
</div>In this version, v.generalize is still broken. You would need a recent<br>
version of GRASS 6.4.2. For Windows, you can get a recent version<br>
here:<br>
<br>
<a href="http://wingrass.fsv.cvut.cz/grass64/" target="_blank">http://wingrass.fsv.cvut.cz/grass64/</a><br>
<br>
Markus M<br>
<div><div></div><div class="h5"><br>
<br>
> On Thu, Jun 30, 2011 at 10:18 AM, Markus Metz<br>
> <<a href="mailto:markus.metz.giswork@googlemail.com">markus.metz.giswork@googlemail.com</a>> wrote:<br>
>><br>
>> On Thu, Jun 30, 2011 at 4:01 PM, Christian Guirreri<br>
>> <<a href="mailto:christian@guirreri.com">christian@guirreri.com</a>> wrote:<br>
>> > I'm a brand new user to GIS - my goal right now is to heavily simplify<br>
>> > Tiger<br>
>> > 2010 county and distrct data, without producing gaps between boundaries.<br>
>> > I've been testing this with v.generalize in grass via QuantumGIS - I've<br>
>> > had<br>
>> > tons of issues with the Grass toolbox crashing, but have narrowed down<br>
>> > to<br>
>> > using the Hermite algorithm. While it works, I'm having some bizarre<br>
>> > issues<br>
>> > with it. Apologies for the cross-post with the PostGIS mailing list.<br>
>> ><br>
>> > In the attached gif of California counties, from left to right, I have<br>
>> > used<br>
>> > the following tolerance values with the Hermite algorithm:<br>
>> > - original<br>
>> > - 1.0<br>
>> > - 0.08<br>
>> > - 0.01<br>
>> > - 0.00001<br>
>> ><br>
>> > Why do counties disappear entirely as I decrease the tolerance?<br>
>> ><br>
>> This problem has been fixed in GRASS 6.4 only 2 weeks ago (June 13).<br>
>> Please update your GRASS version if possible.<br>
>><br>
>> Markus M<br>
>><br>
>><br>
>> > In the Grass Tools I choose the v.generalize function. I choose Boundary<br>
>> > as<br>
>> > the feature type (though I've tried checking others, as well as all of<br>
>> > them<br>
>> > and it doesn't seem to change anything). Everything else is default,<br>
>> > except<br>
>> > for tolerance as notated above.<br>
>> ><br>
>> > When I tested this originally on only Arkansas and Mississippi, I got<br>
>> > really<br>
>> > nice results. I then tried it on the entire US and had the missing<br>
>> > counties<br>
>> > problem. So I tried only California, and still have the same issue.<br>
>> ><br>
>> > I've tried other algorithms, but this has so far given me the detail I<br>
>> > want<br>
>> > - of course sans counties! Any thoughts?<br>
>> ><br>
>> > Thanks,<br>
>> > - Chris<br>
>> > _______________________________________________<br>
>> > grass-user mailing list<br>
>> > <a href="mailto:grass-user@lists.osgeo.org">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>
>> ><br>
>> ><br>
><br>
><br>
</div></div></blockquote></div><br>