video preview: https://youtu.be/wN5lVN1b8VQ 
8k lawn material under snow. The actual size is ~4×4 meters. The material was created using scanning by photogrammetry.

Highly detailed seamless textures:
Diffuse Normals 8192x8192px Displacement (EXR 32-bit): 4096x4096px

To save RAM it is possible to reduce detail by reducing the size of images by 2 times in the photo editor.
In the scene the sample plane is 12×12 meters. Displacement height ~15cm. Used Vray HardWax SSS (Corona absorption) Vray(Corona)NormalMap

*When importing FBX set input gamma = 1 to NormalMap.
Vray 4 and later Corona 7 and later