[GRASS-dev] creation of turntable

Štěpán Turek stepan.turek at seznam.cz
Mon Sep 30 00:45:18 PDT 2013


working on integration of turns support into GRASS 7 I see two possibilities
how to integrate creation of the turntable. 

New module v.net.turntable can be added, which will manage creation of the 

There already exists v.net module which is doing maintenance and preparation
of a network for a network analysis. Creation of the turntable can be 
considered also like preparation of network for analysis. Also in future it 
would be good to  add into connect operation support for modification of the
turntable. And this will require extension of the v.net interface for the 
turntable support.

Suggestion of interface changes of v.net module: 

operation=turntable - create turntable (what v.net.turntable do)


tlayer and tuclayer - two layers where information about turns is stored 
(for description see [1])

                              - these two parameters would need to be added 
into v.net even if v.net.turntable would exist in order to be the connect 
operation able to adjust the turntable. Adding of these parameters could be 
avoided if another connect method would be implemented into v.net.turntable,
 but it would be probably quiet confusing for user. 

-t  flag if this flag would be attached, the connect method would work with 
the turntable support

On the other hand v.net module interface will become even more complex and 
it can become difficult to use by some users.


[1] http://grasswiki.osgeo.org/wiki/Turns_in_the_vector_network_analysis

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