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TIN - PIX4Dmatic

terrain_filter-16

Terrain classification

points_grid

Grid of points

 tin


TIN

 dtm

 

DTM

contour_lines

Contour lines

 manhole_detection


Road object detection

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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.

✅Included: PIX4Dmatic Pro and Analyst

❌Not included: PIX4Dmatic Standard

IN THIS ARTICLE

Input grid of points
TIN generation algorithms
Use terrain layers
Export

TIN_2.0

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.

Tip: It is possible to select more than one grid of points. This is particularly helpful in case it is needed to have different TIN resolutions in different areas.

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.
    tin_quick
  • 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.
    tin_smart

Use terrain layers

  • Use terrain layer for TIN generation. It is also possible to generate the TIN without explicitly selecting an input point grid. In this workflow, all layers used for the TIN must be tagged as Terrain, and no point grid is defined as the input.

    In this case, PIX4Dmatic uses all Terrain tagged layers to create the TIN. The software relies on the geometry of these terrain layers, such as polylines, polygons, and markers defined as breaklines, to interpolate and triangulate the surface.

    Use terrain layers for TIN UI

  • 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.
    breaklines

To define a layer as a Terrain layer:

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

Export

TIN can be exported from the Menu bar, click File, then Export. Alternatively, on the content panel, in the TIN section, export.jpg Export.

The available formats for TIN exploration are GeoTIFF and LandXML.