[Qgis-user] TIN Interpolation from points (survey) with break (interrupt or constraint) lines

[casoli at risorsaterra.it]

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 <mailto: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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