Hello,
We are currently upgrading an FME-based application for one of our customers from FME 2020 to FME 2024, and we have encountered an issue that appears to be related to coordinate system handling.
The application uses FME to convert a set of DGNV8 drawings into an MS SQL Server database. For some drawings, we observe a positional shift of approximately 10 centimeters (a few decimeters at most) after processing.
In the DGNV8 Reader, the Coordinate System parameter in the Navigator window is set to "".
When inspecting the source datasets with FME Data Inspector in FME 2020, all drawings are reported as having an Unknown Coordinate System, regardless of which file is opened.
However, in FME 2024, we see different behavior:
- For some drawings, Data Inspector reports the coordinate system as EPSG:28992.
- For other drawings, it reports NationalRD-NL.
The drawings belonging to the latter group appear to be shifted relative to the other drawings.
My questions are:
- Is this behavior related to differences in coordinate system support and handling between FME 2020 and FME 2024?
- What would be the recommended approach to prevent these positional shifts?
- Would it make sense to explicitly set the DGNV8 Reader's Coordinate System parameter to EPSG:28992? If so, could this implicitly trigger a coordinate transformation during the reading process?
- What exactly is the NationalRD-NL coordinate system? I am not familiar with it. Based on the parameters I have checked, it appears to differ from the commonly used Dutch coordinate system EPSG:28992 (Amersfoort / RD New).
Any insights or recommendations would be greatly appreciated.
Thank you in advance.