How to use Husky on rugged terrain?

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I have created and imported a heightmap in Gazebo, and I would like to drive Husky on it. My problem is spawning a Husky robot causes him to fall from some height and drop somewhere random. Probably the problem is that coordinates for spawning don't have this additional height from heightmap included so Gazebo is trying to spawn a robot in some position (ex. x=0 y=0) but there is some terrain and that causes a problem. Could someone explain me how to solve this problem of interaction and spawning a Husky on heightmap?

I have used this video to learn how to create and import heightmap in Gazebo: https://vimeo.com/58409707 This is mine version: http://pokit.org/get/img/4d2c1ca7e6b8...