Ok!
Say you have a game level that is 500,000 x 500,000 it being the only level in the game.
How would you approach the situation where you would want extreme detail on the ground?
Tilemap, One Large Image, Many medium sized images lined up or what?
Tilemap.
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tilemap and use the tilemap's technique.
so if you have grass, make 1 small grass sprite that you can layer on top of each other, change sizes and angles, opacity or any other attribute... reuse everything...