Interpolates elevation values along a non-aggregated linear feature from a starting value to an ending value. The resulting feature’s elevation will monotonically increase (or decrease) from the starting value to the ending value.
Input Ports
Input
This transformer accepts any feature. Only linear features will be affected.
The elevation of an arc is interpolated on its defined end-points and possibly mid-point (if the arc is an arc by 3 points).
If the feature was two-dimensional, it becomes three-dimensional.
If the feature was three-dimensional, its previous elevations are removed and replaced.
Output Ports
Output
The features with interpolated elevation values.
Parameters
You can enter the parameters as a number, or choose them from the value of a feature attribute by selecting the attribute name from the pull-down list.
Starting Elevation
The elevation value for the first vertex of the input feature.
Ending Elevation
The elevation value for the last vertex of the input feature.
Usage Notes
The SurfaceDraper transformer (available in FME Professional edition and higher) can be used to supply interpolated elevation values based on a 3D grid or set of 3D features to the vertices of two-dimensional features.
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click 
beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
Transformer Categories
FME Licensing Level
FME Professional edition and above
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Technical History
Associated FME function or factory: @Interpolate