What is the difference between independent vehicle type adjustment and air belt adjustment?

The difference between independent model adjustment and gas zone adjustment lies in calculation method and data processing method.

Independent model adjustment is an adjustment method based on independent model, which combines measured data with prior information and solves the optimal estimate of unknown quantity by least square method. In independent model adjustment, the measured data and prior information are treated separately, and the prior information usually includes the weights and prior coordinates of the observed values. This method is suitable for small-scale adjustment problems and the calculation is relatively simple. Air band adjustment is an adjustment method based on air band model, which is mainly applied to large-scale adjustment problems, such as aerial photogrammetry. Navigation band adjustment unifies measured data and prior information, and describes the relationship between observed values by establishing navigation band model. The band model takes into account the correlation between observations and can estimate the unknown quantity more accurately. This method requires complicated calculation, but it can deal with large-scale adjustment problems.