TIN - PIX4Dmatic

Terrain classification

Grid of points

TIN

DTM

Contour lines

Road object detection

Surface comparison

The TIN (Triangular Irregular Network) is a seamless set of triangles representing a surface. In PIX4Dsurvey, the TIN usage is primarily intended to model the ground, from points and breaklines.

Input grid of points

The primary input for the TIN generation are points generated with the Grid of Points process. For more information and settings, please see the Grid of points article.

To select the Input grid of points:

• In Surveying - TIN, select the generated grid of points in the drop-down menu.

TIN generation algorithms

It is possible to generate the TIN by choosing two algorithms:

• Quick: Triangulates all the grid points together, even on edges, resulting in a convex border fitting holes on the grid's edges.
  
• Smart edges: Involves extra post-processing by trying to build a border that fits more closely the shape of the grid points (a concave shape), and remove all the TIN triangles that are outside of this border.
  

Use terrain layers

• Use terrain layer for TIN generation. It is also possible to generate the TIN without explicitly selecting an input grid of points. In this case, all the layers used for the TIN must be tagged as Terrain, and no grid of points is defined as the input.
  In this case, PIX4Dmatic uses all layers that are tagged as Terrain to create the TIN. The software will rely on the geometry of these terrain layers—such as polylines, polygons, and markers defined as breaklines—to interpolate and triangulate. 
  
  
• Use terrain layers as breaklines (Enabled - default): This feature allows the use of polyline, polygon, and marker object types as breaklines if the vector layer is defined as a terrain layer. All layers with the tag Terrain are used.
  

To define a layer as a Terrain layer:

• In the Content - Layers, and Layer properties.
• Toggle the Terrain Layer switch.