A transport equipment comprises at least a carrier that is disposed on the window platform or balcony and thus becomes one part of a building in normal condition, or that is pushed out of the window or balcony for personnel and commodity transportation through a cantilever beam of a slow descending mechanism when in need, to descend or ascend along the outer wall of a building. The apparatus and method are used to display a set of items within a content collection, such as a set of files within a folder on a computer operating system. The single or multiple spectral band system will measure each layer and the total layers and compare the spectral bands of the two to the theoretical spectral designs over the measured region.