Bug report #8354

Improve documentation for interpolation plugin

Added by Paolo Cavallini about 7 years ago. Updated over 5 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Documentation and Help
Affected QGIS version:master Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:duplicate
Crashes QGIS or corrupts data:No Copied to github as #:17134

Description

Notes from the mailing list, to be added to the manual:

So, how are line features supposed to work in interpolation plugin? Or how can i give structure lines hight values that make sense?

Well, somehow you need to say the plugin what the values to interpolate are. Currently possible is to take from attribute or from z-value (for 2.5D geometry types). Where do you have the height values in your data?

So, how are line features supposed to work in interpolation plugin?

The line features are used to modify the triangulation. The triangulation is modified such that no edge crosses a breakline or structure line (constrained Delaunay triangulation). The difference between handling of breaklines and structure lines is that cubic interpolation produces a sharp break rather than a continuous one.

Please note that the interpolation plugin has some numerical problems in the TIN creation that may lead to crashes (especially for data in degrees). There is the option to dump the generated triangle net, so you can see what the plugin does.


Related issues

Duplicates QGIS Application - Feature request #3103: interpolation plugin could have better documentation Closed

History

#1 Updated by Alexander Bruy over 5 years ago

  • Resolution set to duplicate
  • Status changed from Open to Closed

Duplicates #3103

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