Either you change the heightmap to start at the proper value to hit 0, or you move the landscape up so it starts at 0, which depends on the z scale you use on import.
bascially you need to shift all the values in your 16bit png up by 65535/2
Either you change the heightmap to start at the proper value to hit 0, or you move the landscape up so it starts at 0, which depends on the z scale you use on import.
bascially you need to shift all the values in your 16bit png up by 65535/2