[GRASS-user] serious problem with "ROUND-OFF"

[Hamish]

try temporarily increasing the region resolution by 2x for
the r.to.vect step.

?
Hamish 



--- On Tue, 29/9/09, achim <ak7 at jupiter.uni-freiburg.de> wrote:

> From: achim <ak7 at jupiter.uni-freiburg.de>
> Subject: [GRASS-user] serious problem with "ROUND-OFF"
> To: "grass-user" <grass-user at lists.osgeo.org>
> Received: Tuesday, 29 September, 2009, 11:01 PM
> Hi all,
> 
> I have a problem, I really would like to solve, because
> many problems
> occur in my theses in further steps.
> 
> What I do is:
> 
> 1. I break lines at some lengths.
> 2. I use both vector- and raster-data for analysis, which
> is eg.
> updating points with raster-values or converting lines and
> points to raster.
> 
> The Problems are (due to rounding or "non-snapping"?):
> !Points from lines on the edge between two diagonal cells
> (see pictures)!
> These points do:
> 1. not belong precisely to one cell (compared with the line
> they come
> from (see picture v.to.rast.png)
> 2. These points sometimes don't lie on on the cells, the
> line is
> referred to (see picture break.png)
> 
> Any hints are very welcomed!
> 
> Thanks in advance,
> Achim
> 
> -----Inline Attachment Follows-----
> 
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