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Previous: Reducing Unnecessary Coordinates|Next: Kriging from Point Data
In this tutorial,you will learn how to create a Triangulated Irregular Network (TIN) from a 3D point dataset using the TINGenerator in FME.The TINGenerator in FME is able to create TIN's from Points/Lines or Breaklines whether the features are 2D or 3D.
In this scenario,you want to create a TIN because you are interested in draping 2D features on a 3D TIN.This tutorial will only cover the TIN creation but if you are interested in learning how to drape imagery textures on terrain surfaces,read theDraping Imagery Textures on Terrain Surfacesarticle.
The ElevationPoints dataset you are working with contains approximately 1.4 million elevation points.Without filtering out points,the TIN would be very jagged and require more processing power.In order to reduce the number of points used to create the TIN,you need to specify a surface tolerance.A larger surface tolerance value will speed up the surface model construction and simplify the TIN - the larger the value,the more input points will be filtered out.To learn more about Surface Tolerance values,see theTINGenerator Documentation.
The only parameter that needs to be changed is the Z value in the Scale Factor section.You need to change the Z scale otherwise the 3D features in the TIN will be too tall and look unrealistic.
Data used in this tutorial originates from open data made available by theCity of Vancouver,British Columbia.It contains information licensed under the Open Government License - Vancouver.
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