[GRASS-user] Suggested workflow for Importing DXF Wind Turbines onto Map in Grass 6.4.4

Hi,

I have imported a single wind turbine (dxf) into grass with v.in.dxf successfully. I need to position it on a map but do not know where to start.

From the grasswiki pages it says it is best to use XY location but how do you assign known location co-ordinates to the base of a wind turbine (without a copy of AutoCAD). I would also need to add many more wind turbines onto the same map.Do i need to use v.proj/v.transform/v.rectify?

I might also need to set the height of the turbine but again not sure which is the best action.

Thanks,

Paul J. Shapley MSc CGeog (GIS) FRGS

On Wed, Jul 30, 2014 at 10:57 PM, Paul Shapley <p.shapley@gmail.com> wrote:

Hi,

I have imported a single wind turbine (dxf) into grass with v.in.dxf
successfully. I need to position it on a map but do not know where to start.

From the grasswiki pages it says it is best to use XY location

Not sure - better import it into your real world location and then
shift it around therein.

but how do
you assign known location co-ordinates to the base of a wind turbine
(without a copy of AutoCAD). I would also need to add many more wind
turbines onto the same map.Do i need to use v.proj/v.transform/v.rectify?

Say, you have a UTM location, import it into it with v.in.dxf.
Then get it into the right position with v.transform (scale x, y, and z).

I might also need to set the height of the turbine but again not sure which
is the best action.

The z scale of v.transform will do that. I got the water tower in
http://grasswiki.osgeo.org/wiki/Help_with_3D#Vector_3D_polygons
like that into the right position.

Sorry for the late answer,
Markus