L3DT landscapes

Hi there,

I am pretty sure that this hasn’t been asked so far.

I want to know what settings I must have in the landscape tool to use an L3DT landscape in its original size. Last time, I exported the heightmap as a 1024x1024 px PNG and then imported it to UE4. As the outline appeared, it was way too small, so I decided to play with the size (x, y, z) values a bit. Nevertheless, I am not sure if the size of the map is correct, so I want to know better for the next time I import an L3DT terrain.