地面 (dìmiàn) means 'the ground' or 'the floor surface.' It refers to the surface of the earth or a floor. It is used in both indoor and outdoor contexts to describe the surface one walks on.
雨后地面很滑,走路要小心。
Yǔ hòu dìmiàn hěn huá, zǒulù yào xiǎoxīn.
The ground is very slippery after rain; be careful when walking.
孩子们坐在地面上画画。
Háizimen zuò zài dìmiàn shàng huàhuà.
The children are sitting on the ground drawing.
地面上有一层薄薄的灰尘。
Dìmiàn shàng yǒu yī céng báobáo de huīchén.
There is a thin layer of dust on the ground.