[GRASS-user] v.buffer bug??

GRASS GRASS user
1

When I buffer the attached line layer with 250 mapunits I get an unsiutable
result. Take a look of the buffer_error.png image. You will see that the
line at the mean right wasn't buffered correct. To reproduce this behavior I
attach the original line layer.

GRASS-6.1.0

With best regards
Horst Düster

---------------------------------------------

Dr. Horst Düster
GIS-Koordinator, Stv. Amtschef

Kanton Solothurn
Amt für Geoinformation
Abteilung SO!GIS® Koordination
Rötistrasse 4
CH-4501 Solothurn

Tel.: ++41 (0)32 627 25 32
Fax: ++41 (0)32 627 22 14

horst.duester@bd.so.ch
www.sogis.so.ch

(attachments)

test_line_shp.zip (6.59 KB)
buffer_error.png

2

Düster Horst wrote:

When I buffer the attached line layer with 250 mapunits I get an
unsiutable result. Take a look of the buffer_error.png image. You will
see that the line at the mean right wasn't buffered correct. To
reproduce this behavior I attach the original line layer.

GRASS-6.1.0

This is a known bug, see the BUGS section in the v.buffer help page.

Work-around 1: make a buffer half the size, then buffer the result a
second time.

Work-around 2: v.to.rast, r.buffer, r.to.vect

Hamish

3

When I buffer the attached line layer with 250 mapunits I get an unsiutable
result. Take a look of the buffer_error.png image. You will see that the
line at the mean right wasn't buffered correct. To reproduce this behavior I
attach the original line layer.

GRASS-6.1.0

this is bug #2765 by the way,

http://intevation.de/rt/webrt?serial_num=2765

Hamish