I have three different layers loaded into QGIS. Two of the three are perfectly aligned, whilst the third is slightly off.

Layer 1: Raster - LIDAR data from here

Layer 2: Vector - Landscape feature from Ordinance Survey

Layer 3: Raster - Multispectral Image from Airbus (RGB channels)

All the layers have a CRS code of EPSG:27700, which is set in QGIS. However as you can see in the image below, there is still a slight misalignment:

The grayscale corresponds to a processed version of Layer 1, and the colour corresponds to Layer 3, unprocessed. The lines, Layer 2.

I am very new to QGIS and processing of this data in general. Could anyone please tell me if they know what could be causing this and more importantly how to resolve it?

I found a page on this site about manually translating Layers but this seems risky and very cumbersome, as any further processing could be erroneous if I am unable to perfectly line them up with my eye. And of course, if I wanted to do it to multiple files this wouldn't help. Does any one have any better suggestions?

  • The misaligned layer seems to be shifted slightly up and to the left. Is it the same everywhere? – csk Nov 28 '17 at 20:27
  • It appears to be the same everywhere, I will redo the georeferencing. I was under the impression that this should never occur with data that is already georeferenced, perhaps different data providers use different methods to perform georeferencing? Is this common in GIS? When starting in this area I assumed I could trust georeferenced data, I suppose this is not the case in general. – Allan_ZA Dec 1 '17 at 7:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.