I found this old AVI test of the reveal methodology described below.

The schematic flat map subdivides into 3D terrain+aerial photography as the plane moves across.

The next step (not shown), as ground units move in, the terrain further subdivides to its “true” configuration, and the aerial photographs morph into the real texture set, and the actual terrain features (brush, trees, buildings, enemy units) fade in as well.

The resulting battlefield pastiche would be reminiscent of a David Hockney photo-collage.

[ I’m testing out a new video plugin that opens in a popup. Feedback welcome.]