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I am trying to georeference blueprints to the footprint of a building. I'm using the Google Satellite image from the OpenLayers plugin to do this. The blueprints are rotated about 30 degrees. When I run the georeferencer after placing GCP, the blueprints load in vertically, but the rotation doesn't occur...

Why is this?

I figured it would line up the GCPs properly...

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Sounds like you aren't defining your transformation type correctly, and/or not adding enough control points to use the proper transformation type (ie. you'll need to add more than 2 points to get any rotation).

From this document, I'd say you might want to make sure you have enough control points, and try using the Helmert or Polynomial method - those make sure that there is a rotation instead of just a simple shift.

  • Yea, I've got about 30 control points that should be enough... I'm wondering if the blueprints are just too distorted? – jpmaniac87 May 20 '14 at 17:20
  • I would check the transformation method you're using... – DPSSpatial May 20 '14 at 18:04

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