i have a Problem with Roof hights. Some I have controlled with the Tachymeter.
I have differeneces on
Garages: Tachymeter: 168,31m, Pix4d 168,14m, Ground is about 165.85
Roof: Tachymeter 174,79, Pix4d 174,26, Ground is about 165,78
I have controlled 5 Roofes, all have the same Problems.
GCp are messured with Tachymeter and Nivellement.
On a other Project (Smaller, computed as 3d Modell, not as 3dMap) has the Problem not, there the high is exact to 3 cm
What is the Problem? if i compute the Tachymeterpoints on the Roof as GCP there is a error RMS Error 0.28m.
The Points on Ground like sewer covers are correct (+/-1-2cm)
What could be wrong?