[GRASS-user] v.patch fix/workaround needed

[Markus Neteler]

On Fri, Aug 21, 2009 at 8:37 AM, <peter.loewe at gmx.de> wrote:
> Hi,
>
> I am using GRASS6.3 (on SuSE) to create a polygon layer out of several individual polygons.
>
> In a first step, a polygon ("A") is created using v.patch from an outline and a centroid. This works fine.
>
> In a second step, the newly created polygon is added to a larger set of polygons ("SET") using v.patch again.
>
> In a few cases (reproducable) the "SET" polygon is NOT extended by the proper polygon "A" but the centroid of "A" and the polyline of "A" (the process works correctly in 9 out of 10 cases).
>
> Since this process is to run as a script, how can the disjoint tuple of controid-A and polyline-A in the "SET" vector layer be mended again ?

Before we start hunting bugs for nothing, could you please try
GRASS 6.4? AFAIR there have been implemented some fixes in the
topology engine... perhaps it already works?

Markus