Different site calibration transformation parameters for the same project

PIX4Dmapper
1

We have conducted multiple flights on the same site about 1km * 1km. The GCPs of different flights are measured in the same local coordinate system. However, when I checked the site calibration transformation file *** **project_name_image_to_output_transform in project_name\1_initial\params., I noted that the 7 transformation parameters are different. I am very confused about this fact, as the GCPs and output coordinate system do not change among these flights. Can anyone help me understand this please?
Thanks in advance.

Cheers,
Justin

2

Hi Justin. How much are they differing by?

3

Hi Holden @Holden_Greene ,
Sorry to replay very late.

area_plots_3_project
area_plots_3_project842×587 63.6 KB

We have 3 flights in this area. Please see the parameters in ***image_to_output_transform.txt in the 3 different files,
-481390.446,-6985810.692,-27620.345,-0.23155518,-0.069498975,-0.068024728,0.999325056
-455917.16,-6991459.747,18255.8,0.241337191,1.301305334,-0.282870911,0.999875686
-508796.24,-6993303.598,22641.501,0.20501789,0.296165081,0.150006143,1.000669166

PROJCS[“WGS 84 / UTM zone 56S”,GEOGCS[“WGS 84”,DATUM[“WGS_1984”,SPHEROID[“WGS 84”,6378137,298.257223563,AUTHORITY[“EPSG”,“7030”]],AUTHORITY[“EPSG”,“6326”]],PRIMEM[“Greenwich”,0,AUTHORITY[“EPSG”,“8901”]],UNIT[“degree”,0.0174532925199433,AUTHORITY[“EPSG”,“9122”]],AUTHORITY[“EPSG”,“4326”]],PROJECTION[“Transverse_Mercator”],PARAMETER[“latitude_of_origin”,0],PARAMETER[“central_meridian”,153],PARAMETER[“scale_factor”,0.9996],PARAMETER[“false_easting”,500000],PARAMETER[“false_northing”,10000000],UNIT[“metre”,1,AUTHORITY[“EPSG”,“9001”]],AXIS[“Easting”,EAST],AXIS[“Northing”,NORTH],AUTHORITY[“EPSG”,“32756”]]
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