Get yourself above it by placing some floor tiles one level higher than the terrain - then look down. If it looks OK from above then it just needs moving downwards to a ground plane below the player.
If its sitting too high then it would look as in your picture anyway.
I have found the level placement somewhat unpredictable with large terrains especially in FPSC.
If you cant get it where you want it in FPSC just move it downwards in your modeller save back to FPSC ubtil it appears in the right place (height) trial and error will get you there.
Hope that helps
