This is a rendered (by a 3D CGI algorithm) HDR image of an equirectangular grass (moorland) landscape at noon in a sunny day, with clear sky (the environment sky simulated by the algorithm and rendered with different exposure values).
Preview images (spheres and monkey) rendered in Blender 3D Cycles; 3d models and scenes not included in the zip archive.
Equirectangular, 8k x 2k resolution, 4 exposure stops; formats included: psd, hdr, exr, 8bit jpeg (see preview).