[GRASSLIST:10803] Re: How to extract polygons from vector map

[Michael Rensing]

Yeah, that's one way I figured it out. Problem is, I'm generating 
contours from a DEM for a large region, and I wanted to pick one to 
extract. There are no attributes assigned by r.contours that I can use.

Unless a better idea presents itself, I'm going to create small local 
contours around the lakes, then collect them into a single vector layer, 
add an attribute, and use the form mode of the mouse query to edit the 
new attribute. THEN I can use an attribute query to extract the vectors 
I want.

There should be a better way, but this does keep me amused...

Michael

Michael Barton wrote:
> In the new GIS Manager (gism2), if you can display only that polygon with an
> attribute query, you can extract it to a new vector. (See new vector panel
> with button to extract queried vector).
>
> Michael
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution and Social Change
> Arizona State University
> Tempe, AZ 85287-2402
>
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>
>
>
>   
>> From: Michael Rensing <michael.rensing at shaw.ca>
>> Date: Sun, 05 Mar 2006 11:18:12 -0800
>> To: <GRASSLIST at baylor.edu>
>> Subject: [GRASSLIST:10743] How to extract polygons from vector map
>>
>> I've got a vector map where I can visually identify one outline which is
>> a lake. How can I extract that one vector from the layer and turn it
>> into a filled blue polygon in a new layer?
>>
>> You've all been a huge help to me so far, and I hope that the good will
>> continues until I am able to contribute my own answers. If anyone is
>> interested in what I'm up to, I've been keeping a sketchy blog at
>> http://mjr42thoughts.blogspot.com/
>>
>> Regards,
>> Michael
>>