Page History

...

It is also possible to set points on the underlying level and their coordinates in meters (at least 3). This setting is not obligatory. Points setting allow getting track position in absolute coordinates. Points are to be located on one level. Points are not to be on the same line. The more uniformly the points are, the higher the accuracy is. If calibration objects are set, then less than three points can be set. If calibration objects are not set, not less than three points are to be set. 

If the perspective is to be considered when setting maximum and minimum object size do the following:

...