Chapter 2 recap
Ground and place
The key takeaways from this chapter’s 2 lessons.
Survey and reality capture
- Surveyors provide control points, topographic and measured building surveys, point clouds and set-out on site.
- Every survey comes with an accuracy, a date and a coordinate system: record all three.
- Scan-to-BIM models the scanned geometry; the modelled accuracy can't be better than the scan's.
- On site, surveyors set out the building from the model and check what was built against it.
GIS for BIM people
- GIS manages places and networks (land, utilities, roads, assets) as map layers with attributes, at city and regional scale.
- It always works in a coordinate reference system; BIM often uses a local origin linked to one.
- BIM and GIS meet in site selection, utility coordination, infrastructure and owners' asset management.
- The link is the coordinate reference system and shared identifiers, not copying geometry between tools.