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I am using as input a DEM with 0.5 meter resolution.

I would like to clip it in several small areas and export it as several ESRI TIN surfaces.

I did not found this format under the FME writers list.

What are my options?

I would first look into the ASCII writer, this should allow you to import the clipped DEMs straight into Arcmap. You might have to do work to them in Arc after to turn them into TIN surfaces rather then flat rasters.

I would fan out the writer on an attribute to give each ascii a unique name. Its pretty tricky to clip 3D objects so it might be easier to work with rasters and asciis throughout and then convert them to TINs in Arcmap.

Hope that helps @cec_lia

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