64 various ground textures I've made over time (ground, grass, cobble, stones, moss, mud, snow, sand...).
They are PBR-friendly, 1024x1024, TGA format.
For each you have:diffuse/albedo + normal + mask (rgba)
-R : Specular
-G : Roughness
-B : Ambient Occlusion / Cavity
-A : Height
This asset can also be found on my Unity's assetstore and UE4's Marketplace.