Wrong conversion from wgs84 to lambert 72 belgium

[dronesurveyconsultancy]

Hello,

I have processed some matrice 350 RTK data and it seems that metashape makes a wrong conversion from wgs 84 to the belgian Lamber 72.
Does anyone know how to apply a correction grid for X Y and a correction grid for Z values? i dont see a geode file on this platform for Lambert 72.

Anyone has a idea or any software to calculate the WGS84 till lokal system?

Best regards

[Paulo]

Hello,

the Metashape transformation from ETRS89(or WGS84) to BD72 uses the latest 7 parameter transformation as defined in ESPG:
PROJCS["BD72 / Belgian Lambert 72",GEOGCS["BD72",DATUM["Reseau_National_Belge_1972",SPHEROID["International 1924",6378388,297],TOWGS84[-106.8686,52.2978,-103.7239,-0.3366,0.457,-1.8422,-1.2747]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4313"]],PROJECTION["Lambert_Conformal_Conic_2SP"],PARAMETER["latitude_of_origin",90],PARAMETER["central_meridian",4.36748666666667],PARAMETER["standard_parallel_1",51.1666672333333],PARAMETER["standard_parallel_2",49.8333339],PARAMETER["false_easting",150000.013],PARAMETER["false_northing",5400088.438],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","31370"]]

Chjeck that you are using same TOWGS84 parameters:
TOWGS84[-106.8686,52.2978,-103.7239,-0.3366,0.457,-1.8422,-1.2747]]

[dronesurveyconsultancy]

Hello,
It seem that the TOWs84 parameters have a - in some parameters that differ from the ones in metashape.
Anyone knows how to use a correctiongrid on the converted coordinates?

Greetins