[Qgis-user] TIN Interpolation from points (survey) with breaklines

Tue Apr 3 22:58:12 PDT 2018

Hi RiccardoI have communicate with alexander muriy and he works for a portability v.triangle on windows. Currently this scipt work only on unix.
https://github.com/amuriy/GRASS-scripts
The answer of Alexander Muriy :
"Hello! <v.triangle> is a shell script and uses some Unix utilities (sed, awk), so you should use Unix-like environment in Windows (like MSYS or Cygwin). So you can't simply run this script."
Maybe could you insist to advance his script?

For OPenJump what is the problem with polygon 2.5D?

Best regards

Ted
    Le lundi 2 avril 2018 à 22:21:30 UTC+2, Casoli-Risorsaterra <casoli at risorsaterra.it> a écrit :  

Thak you Teddy 

I tried installing Openjump and Interpolate Points with breaklines using the proper Sextante tool but even, if the triangulation was right (respect to the breaklines), the quotes of the 2,5D polygons generated by the tool were not right! Maybe I missed something?

Looking around for some tools useful for my purpuse, I found the v.Triangle (1) Grass module that is no more contained in the Grass Processing Tool in Qgis (or at least I couldn't find it!)

It's simply a "front-end" to the famous utility Triangle (2) of J.R. Shewchuk ...and It should be exactly what I need in Qgis.

Could I do something to support the (re)developping or new adding of this processsing module?

Thanks in advance.

Riccardo

Riccardo Casoli, Geologo (email:casoli at risorsaterra.it; cell:3289026131)

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Studio Associato Risorsaterra

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di Massimo Barbonaglia, Riccardo Casoli, 
 Michele Colombo, Federico Cravello
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via Coda, 22/E - 13900 Biella Chiavazza
 Tel e fax: 01523346
 e-mail: info at risorsaterra.it
 PEC: risorsaterra at professionistipec.it
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C.F. e P.Iva: IT02413380029
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 ______
 (1) https://grasswiki.osgeo.org/wiki/TIN_with_breaklines
 (2) http://www.cs.cmu.edu/~quake/triangle.html

  Da: Qgis-user-request <qgis-user-request at lists.osgeo.org> 
 Data: Venerdì, 30.03.2018 11:01 +0200
 A: qgis-user at lists.osgeo.org
 Oggetto: Qgis-user Digest, Vol 145, Issue 62 

 Message: 1
Date: Wed, 28 Mar 2018 20:10:21 +0200
From: teddy guerin <teddyguerin at yahoo.fr>
To: "casoli at risorsaterra.it" <casoli at risorsaterra.it>
Cc: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] TIN Interpolation from points (survey) with
	break	(interrupt or constraint) lines
Message-ID: <21A57A6C-C608-4C42-8E50-BDDB4B0FF75F at yahoo.fr>
Content-Type: text/plain; charset="utf-8"

Hi,

I seem that you use grass (module of qgis) for this action or openjump 😉.

Regards

Ted

Envoyé de mon iPad

 Le 28 mars 2018 à 19:23, "casoli at risorsaterra.it" <casoli at risorsaterra.it> a écrit :

Hi everybody

I have a PointSHP with Z field value that represents the survey on a step vineyard: points have been token along base and edge of steps to represent slope breaks.

In order to build a TIN (DEM) I created a line SHP and drew a series of lines linking  related  points (respecting morphological alignements).

Then I tried to build a triangulagion TIN (DEM) by "Interpolation TIN" tool using my points with their Z elevation field and my breaklinesline SHP to constrain triangulation inside each slope or step.
But the TIN obtained is a regular inclined surface that follows the general slope of the whole survey given by mean of z value of points: no steps no slopes.

Where I miss? What is the way to build a TIN from points with constrain lines?
I send an image that represents the points and breaklines on a orthophoto foreground and beside the same vector elements on the resulting TIN by interpolation.

Thanks in advance.  

-- 
Riccardo Casoli, Geologo (email:casoli at risorsaterra.it; cell:3289026131)

Studio Associato Risorsaterra
di Barbonaglia, Casoli, Colombo, Cravello
Agricoltura, geologia, foreste
via Coda, 22/e
13900 Biella Chiavazza
Tel e fax: 01523346
e-mail: info at risorsaterra.it
C.F. e P.Iva: IT02413380029

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