Channel Question

This is probably the best place, pretty simple question really:

Can i make Channel act like blink. Aka: So that i can't target it on unexplored areas or areas that are not ground pathable. If so, how?

I made a triggered blink that works like the normal blink, heres the link:
Its got sometinh to do with a fog/black mask boolean, i dont remember
http://www.wc3campaigns.net/showpost...6&postcount=87