Q: "A snowboarder seemingly suspended in midair." Does this mean that "the snowboarder is on the ground"?
A: no

Q: "A girl sits in a harness ready to lift up into the air and behind her is a sign that says "active."" Does this mean that "Someone sits in a harness in front of a sign"?
A: yes

Q: "A black dog running through water." Does this mean that "There is a black dog."?
A: yes

Q: "A worker piles some objects on a rocky road." Does this mean that "A worker prepares a pile for the road construction crew."?
A:
it is not possible to tell