ftools: Intersection and union don't produce a result

[qgib]

Author Name: Horst Düster (@hdus)
Original Redmine Issue: 2536

Redmine category:python_plugins
Assignee: cfarmer -

---

1. open the attached shapes (both produced with ftools/buffer)
2. select ftools union/intersection
3. proceed the union or intersection process
4. message with bad geometries appears

=> no result

My system:
gdal-1.7.1
geos-3.1.0
QGIS -r13034

---

• test.zip (Horst Düster)
• add_warnings.diff (Alexander Bruy)

[qgib]

Author Name: dr - (dr -)

---

Confirmed. I've get the same problem on some of my layers.
Moreover if both merged layer's attribute tables have the same field's name, Union tool does not consider it. At result we have table with field names: NAME, NAME_1, NAME_2... It will be useful to merge such fields (with the same type and name) into one column.

[qgib]

Author Name: Alexander Bruy (@alexbruy)

---

This is related with #12689. Also here is another problem: when field names trimmed and suffix added we will have duplicate names and get error when initialize shapefile writer. I found three tools with this problem: union, intersection, symmetrical difference

Patch to fix this problem (evaluate field name lenght, check for duplicates and display warning messages) attached

[qgib]

Author Name: cfarmer - (cfarmer -)

---

Patch applied in . Thanks to alexbruy!

Carson

---

• resolution was changed from to fixed
• status_id was changed from Open to Closed