All you have to do in order to avoid horizon obstacles is to create a horizon in the horizon editor. Then you can let the program choose your sample locations and it will try to avoid defining any below your horizon. One or two might still end up being behind something, but no biggie. The moon is the usual elephant in the room if it's up.
Looks like you have a well mounted small refractor? Those always give the tightest models with the least scatter.
Oops, didn't see your other post...
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