[GRASS-user] square buffeer

[Pedro Camilo Alcantara]

I would rather rasterize at different grain size the same vector layer and
then vectorize it. Just using g.region, v.to.rast, and r.to.vect
respectively

Best


On Mon, Jun 16, 2008 at 10:10 AM, Jonathan Aguero-Valverde <jua130 at psu.edu>
wrote:

> Martin,
> I think using vectors and some scripting will be the way to go here.
>
> A simple script should be something like this:
> 1. create a new polygon vector with v.edit
> 2. for each point in your points vector get the x and y coords  (v.to.db or
> maybe v.report)
> 3. calculate the vertices of your polygon based on the x and y coords.
> 4. Add new feature with v.edit
> 5. add vertices to feature with v.edit.
> 6. repeat for each point in points vector layer.
>
> You can also use postgres/postgis functions and create the layer in
> postgis, you won't need a script but you have to learn some about postgis.
>
> Hope this helps.
>
> Jonathan Aguero-Valverde
> PhD. Candidate
> The Thomas D. Larson
> Pennsylvania Transportation Institute
> The Pennsylvania State University
>
> ----- Original Message ----- From: "Martin Wegmann" <
> wegmann at biozentrum.uni-wuerzburg.de>
> To: <grass-user at lists.osgeo.org>
> Sent: Monday, June 16, 2008 10:18 AM
> Subject: [GRASS-user] square buffeer
>
>
>
>  Hello,
>>
>> I am looking for a way to create a square buffer for a point vector so
>> that
>> each point is in the end the centroid of a square with defined side
>> length.
>>
>> I though about r.mapcalc statements to grow north-south and west-east and
>> then
>> somehow create an area from this square. But I have no idea how to do it
>> without a lot of hand-work.
>>
>> Any idea how to achieve that? Or hints where to find relevant documents.
>>
>> Martin
>>
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>>
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-- 
Pedro Camilo Alcántara Concepción
Department of Forest and Wildlife Ecology
Rm. 120 Russell Labs
1630 Linden Dr.
Madison WI 53706-1598
Phone +1/608/265-9219
http:/silvis.forest.wisc.edu
___________________________________________
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