based on microsoft kinect developer [13], the depth sensor has two depth ranges: the default range and the near range(shown in the depth range enumeration).
In figure 2 illustrates that the sensor depth ranges in meters.
the default range is available in both the kinect for windows sensor and the kinect for xbox 360 sensor; whereas the near range is only available in the kinect for windows sensor which shown in figure 2.
as such, the depth sensor can be seen as a device that returns(x,y,z)- coordinates of 3D objects.
From figure 1,default range has a blind spot from 0m to 0.8m,where in cannot generate raw depth data for anything in that region .
It also generate raw depth data for anything after 4 meters.
On the other hand,the near range has a blind spot from 0m to 0.4m where it cannot generate any raw depth data for anything in that region
it also a cannot generate any raw depth data for anything after meters