Hello Support Team and Pix4Dmapper Users,
In recent months we frequently faced Z-axis offset (elevation shift) on check points
while using PPK images of senseFly eBeeX + AeriaX and we were told it is because of the camera calibration error , we normally had around one GSD accuracy for XY.
We arranged a test field with area around 60 ha with 6 GCPs and flew 3x GSDs
with each following combination
eBeeX+AeiaX @ GSD=3cm, 6cm & 10cm
eBeeX+SODA @ GSD=3cm, 6cm & 10cm
eBeePlus+SODA @ GSD=3cm, 6cm & 10cm
for each GSD we see a shift on check points with no GCP
but in combined 3 GSDs in eBeeX with both cameras we had much better results
but still have a slight shift (it is not in random range with + - signs)
From accurate combined process, we copied the optimized values of
f, Px, Py, R1, R2, R3 and saved in a new camera in database
and reprocessed the inaccurate GSD project with selecting it
and changed the calibration settings to
Method= Alternative, Internal= None, External=All
Then Rematch and Optimize to fix basic parameters
Sometimes It highly improves the results, sometimes not
the behavior is inconsistent and uncontrollable
I think until last year we did not have this problem
and we had accurate flights with PPK
It became a nightmare for us
Any other users have ever faced this?
Awaiting for your kind solution or response
Regards
Mehdi