Above Ground
On The Ground
noun, の adjective
Remember 地下, which is "below ground." Well, this is ground and above combined together, so I bet you can guess that this means above ground. But usually things above ground don't float (unless you're in space), so it's really on the ground.
ちじょう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
木のはが地上におちた。
The leaves fell to the ground.
コウイチは地上1kmの所に、ひみつき地をもっている。
Koichi has a Secret Base 1km above ground.
東京タワーは、地上から見上げると物凄い迫力がありますね。
When you look at Tokyo Tower from the ground it feels tremendously powerful.