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Amcl initialpose coordinate system

I'm still in the process of learning ros and i have a question regarding the initialpose topic. I'm transforming points from the kinect pcl to map coordinates (for sending goals) and using initalpose orientation to known which way is forward in a map. The problem is that when i get the point from the inital pose its values are: x,y,z = 0,0,-1. Why is z set and not x? Isn't the z axis the axis pointing up?

Thanks.

Amcl initialpose coordinate system

I'm still in the process of learning ros and i have a question regarding the initialpose topic. I'm transforming points from the kinect pcl to map coordinates (for sending goals) and using initalpose orientation to known which way is forward in a map. The problem is that when i get the point from the inital pose its values are: orientation with values: x,y,z = 0,0,-1. Why is z set and not x? Isn't the z axis the axis pointing up?

Thanks.