Ramp (OpenData)

An inclined flat surface providing access for wheeled objects between adjacent areas of different heights. It is spatially abstracted to an Area. Entity type: Thing一种倾斜平面，可为带轮物体在不同高度的相邻区域之间提供通行路径。该对象在空间维度上被抽象为区域（Area），实体类型：实体（Thing）。