This is a whole slab of concrete photoscanned on a farm, measuring about 8 feet by 12 feet and 5 inches (2.44x3.79 meters), and a resolution of 13,200x8,5321 pixels (Over 1,000 pixels per foot). There are albedo and roughness maps included. I have also included a rain roughness map jpeg file, and a rain shader setup in the Blender file, to switch between dry and wet.
There is a secondary mesh in both the .blend and .obj files that marks the locations for particle grass generation between the cracks.
As a bonus, the Simple Grass and its particle settings you see in the example renders are included in the Blender file for free.