These materials are part of the results of my journey into photogrammetry.
I used an old canon to capture as straight as possible unto these surfaces on an overcast day. They're meant to serve a forest scene, and covers the different varieties you normally find in a Nordic pine forest.
I developed a process using RealityCapture and Substance to create these that you can read more about here on my blog: https://www.artstation.com/blogs/emilskriver/MQZM/ground-photogrammetry