I was established 8 control stations around the building. I have been conducted building survey with total station for relative Geo-referencing.
Each control station having 4mm error and total station- Pentex laser light accuracy 3mm
Now I got GCP accuaracy RMSE xy = 1.97 cm RMSE z = 0.7 cm.
For check points RMSE xy = 1.64cm RMSEz = 0.9 cm
According to article Horizontal accuracy should come 2* GSD = 6mm for my model. but I am having high error.
can you please suggest regarding this information