I did a trick with the ground plane. I perspective UV corrected with Poser because the original aerial image didn't look good with planar projection, also had to correct with other program the mapping that Poser did that was also not good.
Of course that this setting only will works with the defined camera angle, but it will not hard to do a morphing ground plane that adjust itself its UV mapping with the different cameras angles.
Also added a little distance fog with transparent planes. I have not used Poser's depth cue because Poser has not control of the height of the fog.

All this works fine for static scenes and the scene easily can be mount picking the right background and ground images. Instead of a ground plane you can use a terrain if it is properly mapped.
For animation things get very much more complicated due the different cameras angles and so the ground and background planes becomes big and to achieve a good quality the image textures would be very huge and impossible to render. Also is waste of resources, you load a huge resource and use a tiny fragment for a scene rendering.
Tiling  can help a little because you can use normal textures, but for animation it won't look good to the repetitive and boring pattern of the textures.

Vue solve this problem easily. Vue can generate procedural clouds, sky and terrain mapping, also you have a great control of fog, haze and atmospheric effects.
Vue only creates what the camera see in the rendering, move the camera and it will create other things that the camera see and is fast.

I have very little experience with Poser's atmosphere, when I tried to do something the renderings were so slow that I quit and most things thet I wanted was unable to do.
I want smoke, fire, fog limited to a volume, ghosts, ghostly effects......

Stupidity also evolves!