Hi Andrea,
You could use my plugin: Shapefile viewer (shameless plug!) if you
are using a shapefile and that shapefile doesn't have too many
vertices (less than ~10000) and you have QGIS 1.5 or greater.
How to use it:
Select the shapefile in the legend and then launch Plugins ->
Vector -> Shapefile Viewer.
After loading the shapefile into the plugin, it will show a long
list of vertices making up your polygons.
Click on a cell of one of the vertices and it is highlighted with a
red square in the canvas (all the other vertices of the same polygon
are highlighted with blue squares). Keep clicking on different
vertices cell to see where that vertex is and hopefully you will
find your intersection.
Note you cannot use the keyboard to highlight a vertex, you need to
mouse-click on one of its cells.
This is a (tedious) manual workaround but it should work...
HTH,
Benoit
On 27/10/2010 11:35, Andrea Peri wrote:
Hi,
I have an invalid geometry due to a self-intersect
I find it using the tools for validating.
But the tool report the record with the wrong geometry not report
(obviously) the vertex .
Now I must to find the vertex to correct the problem.
But the shape of geometry is quite complex, has many vertex, and
often it is touchind itself without a real self-intersect.
These touches are not error. But most probably some of these touch
are instead intersection. So I must find what between all the
touching are instead intersections and correct them.
To understand where is the intersect I need follow all the vertex
of the shape.
I don't find nothing to do something to follow all vertexs of the
geometry.
Because the geometry is a polygon, I try to build a rendering with
a fill empty and an outline with a decoration using an arrow to
see the orientation of the lines (hoping to detect the
intersection) but this choice seem to be impossible.
There a method to follow the vertex of a shape in qgis ?
Thx,
--
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
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