Data preprocessing in Copre
CHCNAV ALPHAAIR-450 USER MANUAL | 2021-10 P a g e | 47
Parameter description:
▪ Central Meridian: The software automatically identifies the Central Meridian of the point
cloud.
▪ Thread Count: The number of threads that participate in adjustment
calculations ,according to computer configuration.
▪ The missing time interval of the corresponding point (0 - 99.99 s): The time interval a
homonymous point is missing between adjacent overlapping regions, it is generally equal
to the time interval between trajectory points.
▪ Time Interval Between Points (10 - 30 s): This parameter is generally 2-3 times of the
Segment Time (10 - 30 s). The smaller its value is, the more trajectory sampling points are,
and the more time and space are consumed. If the calculation time is too long, the value
of this parameter can be appropriately increased.
▪ Smoothing Time Threshold (0 - 99.99 s): The smooth region outside the range of the
homonymous points.
▪ Corresponding Point Range(0 - 3.00m): Generally, the value is 2 meters, indicates that
matched point pairs within 2 meters belong to the homonymous points.
▪ Corresponding File RMSE Threshold (0.10 - 3.00 m): If the RMSE of the homonymous
points calculated is bigger than this parameter, it will be removed.
▪ Maximum Ranging (0 - 9999.99 m): The maximum distance filter parameter set when the
point cloud is solved.
▪ Segment Time(2 - 20 s): According to the actual speed to set, generally according to a
section of 60 meters, such as highway measurement can be set smaller (such as 2 - 6 s),
city measurement can be set larger (such as 6 - 12 s).The general setting on UAV is 5 - 20
s.
▪ After setting parameters, click Adjust, and the software will adjust automatically
Figure 42
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