Dead Grass - Photogrammetry based Environment Texture

Photogrammetry based environment texture of low dead grass.
47.5mln highpoly mesh was reconstructed from 227 photos. Camera's focal length during capture was set to 35mm, apreture f/8.
Render looks fine when I use 4k texture, but when I downsize it to 1k looks noisy and lacks definition. I think I didnt want to loose highpoly data too much and picked too big area to bake from. I think I would do better by decreasing lowpoly coverage and bake more focused on details texture. Will try to fix it with the next one.