buffer question

[Giovanni Manghi]

Hi all,

a friend is asking me if there is a straight way in GRASS to make a
buffer like the one represented in this arcgis screenshot

http://evora.sigaberto.org/downloads/buffer.jpg

the buffer would be calculated along a line splitted with v.split

thanks in advance

-- Giovanni --

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[achim]

It seems, that there are line-segments and a buffer is made for each. Do
you mean that?

Otherwise check:
http://grass.itc.it/grass64/manuals/html64_user/v.buffer.html

eg.
v.buffer input=map output=buffer type=line distance=100

Flags:

-s
    Make outside corners straight
-c
    Don't make caps at the ends of polylines


Cheers,
Achim


Giovanni Manghi schrieb:

> Hi all,
>
> a friend is asking me if there is a straight way in GRASS to make a
> buffer like the one represented in this arcgis screenshot
>
> http://evora.sigaberto.org/downloads/buffer.jpg
>
> the buffer would be calculated along a line splitted with v.split
>
> thanks in advance
>
> -- Giovanni --
>
> _______________________________________________
> grass-user mailing list
> [hidden email]
> http://lists.osgeo.org/mailman/listinfo/grass-user

_______________________________________________
grass-user mailing list
[hidden email]
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[achim]

Here I tried a bit and it seems, that v.buffer works for whole geometry,
not for each part (like each line segment gets its own area).

So there is no direct way, as I can find out.

...some missing feature!

..doing it for each extracted line and patch them together would be a
workoround here...

Achim


Giovanni Manghi schrieb:

> On Fri, 2009-10-09 at 19:32 +0200, Achim Kisseler wrote:
>> It seems, that there are line-segments and a buffer is made for each. Do
>> you mean that?
>
>
>
> yes, I meant that
>
>
> cheers
>
> -- Giovanni --
>

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[Giovanni Manghi]

On Fri, 2009-10-09 at 19:58 +0200, Achim Kisseler wrote:
> Here I tried a bit and it seems, that v.buffer works for whole geometry,
> not for each part (like each line segment gets its own area).
>
> So there is no direct way, as I can find out.
>
> ...some missing feature!



It would be useful also to have a "side" parameter.




> ..doing it for each extracted line and patch them together would be a
> workoround here...



it seems it would be painful for more than a few line segments, but
meanwhile is better than nothing.


thanks

-- Giovanni --

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