Hi, I am transforming microstation files (DGN V7) from an local (ADN1953) coordinate system to microstation files (dgn V7) another local coordinate system (AGN2005). The arc features are not going over.
Question
DGN V7 arc features not converting when switching coordinate systems
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+19- Safer
- 1637 replies
Hi @louis_boekhoudt,
FME attempts to retain arcs as arcs when reprojecting data, but this is not always possible. In this case, FME will stroke the arc into a linestring, to ensure that its path in the new coordinate system is correct.
Without seeing your log file, I can't be sure, but what is likely happening is that the arc has been stroked to linestrings, but the igds_type is still set to igds_arc, causing the writer to skip the feature.
If you do the conversion in FME Workbench, you can use an AttributeRemover to remove the igds_type attribute, forcing the writer to figure out what the type is from the actual geometry.
+2- Contributor
- 4 replies
HI.
case nr:138241
I did reload the FME desktop version 2017.1 and rerun the conversion it went perfect.
So I think there must be something wrong in this case with the FME dektop 2018.1.
Louis
+19- Safer
- 1637 replies
Hi @louis_boekhoudt,
Thank you for sending us the repro case.
We introduced 3D arcs as a new geometry in FME 2018. We do seem to have a few issues writing these new arcs to Microstation DGNv7.
I have created problem reports for our development team, and will notify you as soon as they are fixed.
There is a workaround to avoid the missing arcs:
- Instead of setting the source and destination coordinate systems, use a CsmapReprojector transformer to do the reprojection.
- Before the reprojector, use an AttributeCopier to copy the attribute igds_type to _type.
- After the reprojector, use another AttributeCopier to copy _type back to igds_type.
I'm sorry, but there is no workaround right now for the bad arcs within a polygon path, unless you use an Arcstroker to stroke the arcs to linestrings before reprojecting.