Worldwide mesh coverage... 300m resolution

OK Simviation has a very nice 76m mesh, that is great for flying around in.
But that one needs some distance patching, as the stuff that is beneath it is on a 1 km grid and gives leaks in the distance.
So what i'm searching for is 150m-300m resolution mesh to cover the distance holes a bit.
I already have europe and a bit of canada, but not much else outside that area...
But that one needs some distance patching, as the stuff that is beneath it is on a 1 km grid and gives leaks in the distance.
So what i'm searching for is 150m-300m resolution mesh to cover the distance holes a bit.
I already have europe and a bit of canada, but not much else outside that area...