Skip to main content
  • EN

I have the following problem: I want to convert dwg-plans automatically to geopackage/dxf. Most of the plans are not in any geographic coordinate system. I'm trying to construct two separate workflows:

 

  1. First detect if the dwg has a coordinate system. If so, just use reprojector to confirm if it is in right coordinate system and use user controlled scaler (sometimes units are m, sometimes mm) then convert to geopackage (this workflow generally works)
  2. If the file doesn't have any geographic coordinate system, move it to a certain point and scale it (user parameter) preserving distances and angles (because the file used for precise work in QGIS later). The aim to move the drawing in certain location, is to more easily move it manually in QGIS without having to search it from 0,0 coordinates.

I've tried LocalCoordinateSystemSetter among others and got some realistic coordinates when inspecting in FME, but when importing to QGIS, it seems to be in another dimension compared to all the other data in same projection. Is it even possible to achieve this without warping the geometry in some way?

For georeferencing CAD drawings in a local coordinate system, I mostly use the AffineWarper with four control lines (from-to vertices).

If you just want to move and scale the geometries, you could use the Offsetter + Scaler, or the Affiner.

Reply


Community Stats

30,171
Posts
114,537
Replies
37,834
Members
Terms & ConditionsCookie settings
A product of
Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.