[Qgis-developer] Proposal for new features in ftools (Intersect)

Frédéric Jacon frederic.jacon at camptocamp.com
Fri May 23 08:26:09 PDT 2014

Dear all,

We would like to have your feedbacks on our proposition to add new
functionnalities in ftools.

These functions come from the 'SELECTPLUSFR' extensions, developed by
MASSE (french Ministry of Ecology) and available here :


 Originally 'SELECTPLUS' is a collection of tools for selecting objects on
vectors historically developed by Barry Rowlingson and supplemented by
Carson JQ Farmer.

*Proposal *:

 The “intersect” tool from the GeoProcessing Tools could be generalized so
that the user can :


   Choose to select on the active layer only, or on all layers, or on first
   layer (layer "highest" in the order of layers), or on first content
   selection (search for all layers and stops at the first layer that returns
   a selection).

   Perform the intersection only with selected features.

   Choose the operator among Within, Overlaps, Contains, Crosses, Disjoint,
   Equals, Intersects (default operator), Touches, DE-9IM operator (with the
   possibility to set options)

   Choose between creating a new layer, creating a memory layer or making a
   selection on a target layer*.

 * Selection on a target layer : Selection on target requires that the
active layer (which will provide the target) has at least one selection.
Target selection on all layers are scanned. The active layer itself is
scanned or not according to the option selection.

If this proposal gets your attention and interest, we could be able to work
on it for the version after 2.4.

All feedbacks welcome !

Thanks !

Frédéric Jacon
Responsable d'agence - Chef de projets
Camptocamp France
Savoie Technolac
BP 352
48 avenue du Lac du Bourget
73372 Le Bourget du Lac, Cedex

+33 614 71 28 24 (mobile)
+33 479 26 57 97 (direct France)
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+33 479 44 44 94 (standard)
+33 479 70 15 81 (fax)
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