Creating terrain heightmap from real world unidrectional radar image?

It doesn’t need to be accurate, a guess/false positives are alright. It’s just to get the texture on the terrain for better viewing of features. I already have a lower res elevation map of the region.

I can’t get any more data, this isn’t even from earth. Also the picture I posted is just a small cropping of the entire region which is nearly 100x100 km so the terrain editor isn’t an option.

So all of that said, is there any method to even get some texture out of the image? Again it doesn’t have to be accurate.