Replace ocean with color or texture

in Raster Data
Hello, I’m rather new to GM.
I have georeferenced aerial photos that contains a lot of ocean. I also have height data for the same areas. Is it possible to replace all photos below a threshold (say 0.1 meters) with a generic color or tiled texture?
We are using the data in a game engine where we stream in the texture tiles based on camera location, and we also have underwater seabed which currently is colored with ocean photos. I would like to replace the photos of the ocean with a generic color. Because of the varying color of the ocean in the photos I can’t just select based on color, which is why I was hoping to use the heightdata as a “mask”.
Hope this makes sense, any help is appreciated.
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