I have tried to transform the coordinates of a single point (541000, 4516000) with epsg:23033 into 2 other coordinate systems (epsg:25833 e 6708).
I have done these transformations using 2 different methods: DB Manager (with an sql script) and export layer. However the results of these transformations are different. I know that DB Manager uses the Spatialite engine for processing the sql script and the results are the same as those obtained using Spatialite or PostGIS (both based on Proj lib). I do not know how the export layer method produces the results. I expected the same results but this is not true. Does someone know more detailed information about this subject ? Here the details of the transformations Punto di partenza ED50/UTM zone 33N (epsg:23033) X Y 541000 4516000 da 23033 a 25833 (ETRS89/UTM zone 33N) X_Spatialite 540998,138333 Y_Spatialite 4515921,565375 X_PostGIS 540998,138333 Y_PostGIS 4515921,565375 X_QGIS_DB_Manager 540998,138333 Y_QGIS_DB_Manager 4515921,565375 X_QGIS_export_layer 540931,341497 Y_QGIS_export_layer 4515810,597826 da 23033 a 3065 (IGM95/UTM zone 33N) X_Spatialite 540927,563731 Y_Spatialite 4515811,141068 X_PostGIS 540927,563731 Y_PostGIS 4515811,141068 X_QGIS_DB_Manager 540927,563731 Y_QGIS_DB_Manager 4515811,141068 X_QGIS_export_layer 540998,138333 Y_QGIS_export_layer 4515921,565375 da 23033 a 6708 (RDN2008/UTM zone 33N) X_Spatialite 540927,563731 Y_Spatialite 4515811,141068 X_PostGIS 540927,563731 Y_PostGIS 4515811,141068 X_QGIS_DB_Manager 540927,563731 Y_QGIS_DB_Manager 4515811,141068 X_QGIS_export_layer 540998,138333 Y_QGIS_export_layer 4515921,565375 Thanks in advance Antonio Valanzano
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