Las dataset to raster, ground points only

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I'm trying to make a raster from a las dataset. I want to only use points classified as ground points but I can't figure out how to do this. What I've tried is:

• Create las dataset from 2 .las files
• Filter dataset on ground using
• LAS Dataset toolbar Open LAS Dataset to raster tool
• Pick the dataset and use linear interpolation on avarage cell assignment type

The result is a raster with all points including non-ground points.

When I'm in the "LAS Dataset to raster"-tool I'm choosing an external file that doesn't get affected from what I've done in the LAS Dataset toolbar. How do I make the filter affect the dataset before turning it into a raster?



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