Javad-LS averaging question

[Joe D]

If I have RTK Boundary shots and Quick Topo shots for an observation, more weight seems to be applied to the QT shots when averaging. Is this because of the 5 engines required for the QT? Is it unwise to include the QT shots as they had not undergone the validation phase?

 

[Shawn Billings]

Averages are weighted only by the statistics of the point. Longer observations will develop more realistic statistics as the individual positions (epochs) drift over time and give a better indication of the precision of the shot. With a short observation (for example, Quick Topo is only 2 epochs long), there aren't enough epochs to give a realistic error estimate, so it is likely that it will give have a higher weight in the average even though it's more likely in reality to have a better precision than a longer observation. It's best to only average points that have similar duration of observation, particularly the number of epochs in the solution.

 

[Joe D]

Thank Shawn. That makes sense.