Making a1:1 Scale Map from Real World Height Maps

I know this is a tad old of a thread but it seemed to apply so, just wondering is there no way to export a heightmap from method you described above, to get say a precise sq mile size, in my case 25sq x 12sq ?

I’ve searched, but short of world machine ‘pro’ which faik is the only way to get tiles ( cant afford it atM!), I see no other way to do this, short of manally doing all of it.

Speaking of doing it manally, to make my own terrain if I were to do it in unreal editor, how do I get a precise size, as the one in this post ?

thx!
nl