[Gvsig_english] Issues on intersection between two polyline layers

ernesto sferlazza e.sferlazza at gmail.com
Wed Jun 13 10:45:28 CEST 2012

Hi all, I want to submit two issues (bugs?) to developers.

First issue: multiple intersections
I want to find all intersections between two different layers of polylines.
To do this, I use the "intersection" algorythm of gvSIG.
The resulting point layer leaves out all multipart intersections (i.e. when
a line of the first layer intersects a polyline of the second layer in more
than one point).
If I perform the same geoprocess with OpenJump, the resulting layer
contains multiple intersections too (one multipart feature for each
multiple intersection), so that I can explode multipoints in many single
features (points) in a subsequent step.
The workaround using gvSIG is to split previously all polylines in single
segments, so to avoid multiple intesections.
Al gvsig versions (1.11, 1.12, 1.2) show the same behaviour.
I think that it is not a good behaviour.

Second issue: intersection between a polyline layer with a clone of itself.
No problem using gvSIG 1.11, while using gvSIG 1.12 (build 1411) it appears
an error message. The corresponding lines in gvSIG.log are the following:
DEBUG Thread-30 com.iver.andami.messages.NotificationManager -
java.lang.ClassCastException: es.unex.sextante.gvsig.gui.ToolboxDialog
cannot be cast to com.iver.cit.gvsig.project.documents.view.gui.View
 at com.iver.andami.PluginServices$1.construct(PluginServices.java:405)
 at com.iver.utiles.swing.threads.SwingWorker$2.run(SwingWorker.java:108)
 at java.lang.Thread.run(Unknown Source)
Neverthless, point and line layers are created in the destination folder,
though they are not loaded in the view.

Best regards,

ing. Ernesto Sferlazza
responsabile nodo provinciale di Agrigento del SITR Sicilia
resp. gruppo Sistema Informativo Territoriale
Provincia regionale di Agrigento
sede istituzionale: piazza Aldo Moro, 1 - 92100 AGRIGENTO
sede operativa: via Acrone, 27 - 92100 AGRIGENTO
cell. 3392718463 (personale)
       3316874296 (aziendale)
tel. uff 0922593752
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