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Is there a way to convert 2D features to "3D" features in QGIS? I know there is a way to do this in ArcMap by using an attribute value in the attribute table, but I am looking to do this with shapefiles in QGIS.

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I want to convert to 3D from 2D – user39281 Oct 16 '14 at 11:15
    
Convert what? Lines, polygons, points? – Ryan Garnett Oct 17 '14 at 1:04
up vote 4 down vote accepted

You can use the v.to.3d module in the GRASS toolkit (installed with QGIS) to do 2d to 3d layer transformation:

v.to.3d - Performs transformation of 2D vector features to 3D.

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Thank you, this seems to be the exact tool, however, when I look for the tool in the GRASS Tools I do not see it. There are four tools available (r.topidx, vdrape, v.random and nviz) when filtered by 3D, but no v.to.3d. I am new to Grass Tools, is there something I am doing incorrectly? – Ryan Garnett Jun 21 '12 at 16:08
    
The module is new to version 6.4.0, see link grass.osgeo.org/announces/announce_grass640.html – artwork21 Jun 21 '12 at 16:28
    
I have downloaded and installed the newest version of Grass (6.4.1-1). After installation I do not see the v.to.3d tool available within QGIS. What am I missing? – Ryan Garnett Jun 21 '12 at 17:12

Sorry for the long time to answer, I was on vacation. I am using the QGis 2.14 in portuguese, but i'll try to show you the steps with pics bellow.

1- click in save as

enter image description here

2- On the "save window" choose the option "inclui dimensao-z" in english is equal to "include Z data" i think. enter image description here

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QGIS 2.14 version does convert 2D to 3D features.

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

3  
How? Providing some details on which tools to use would make your answer helpful. – SaultDon Mar 11 at 22:34
    
Thank you, this is really good to know – Ryan Garnett Apr 29 at 20:03

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