I have IFC data that originally used a local cartesian coordinate system. It originated in Navisworks and I used Intergraph Smart Interop Publisher to convert it to IFC format so I could use it in FME. I want to use the data in GIS software (ArcGIS Pro/Online) so will likely convert to multipatch/revit.
What is the best approach for georeferencing this data/working out control points, etc.? Some of the IFC files are quite large (500MB+). Any suggestions appreciated!
If the details in the 'Site' are correct in the IFC then FME will place it correctly automatically. If you have control over this then I encourage you to use this as it will remove headaches in FME. FME will create local a projection (in m) based on the Lat Long in the site element. A reprojecter into any coordinate system should work fine.
Just be sure the origin of the IFC is on the Lat Long in the Site element. Also be sure you're using the latest version of FME because the IFC reader is always being improved and in the past (FME 2018.1) could get stuck when processing.
If your data are projected then you just need to specify the projection in the reader and FME should do the rest.
If the details in the 'Site' are correct in the IFC then FME will place it correctly automatically. If you have control over this then I encourage you to use this as it will remove headaches in FME. FME will create local a projection (in m) based on the Lat Long in the site element. A reprojecter into any coordinate system should work fine.
Just be sure the origin of the IFC is on the Lat Long in the Site element. Also be sure you're using the latest version of FME because the IFC reader is always being improved and in the past (FME 2018.1) could get stuck when processing.
If your data are projected then you just need to specify the projection in the reader and FME should do the rest.
Thanks Matt - I appreciate your suggestions. Unfortunately I don't control the source Navisworks data, but I have advised them for next time. It's looking like it will be a tough task - if I come up with a way that works I will post it here.
Hi @mikiekelly,
If the IFC does not contain the world location in the Site, but you have at lease four known points in the model, you can use the FME Hub transformer 3DAffineWarper to georeference the model, then the CoordinateSystemSetter to set the appropriate coordinate system for the georeferencing.
Hi @mikiekelly,
If the IFC does not contain the world location in the Site, but you have at lease four known points in the model, you can use the FME Hub transformer 3DAffineWarper to georeference the model, then the CoordinateSystemSetter to set the appropriate coordinate system for the georeferencing.
Awesome thanks for the suggestion Dave - I will give that a go.