For some time, I have been trying to georeference an old map of Quebec. On photo 1, there is the indication on the projection. Map from 1936-1937, with small corrections in 1946

On the Transverse Mercator projection

I use the coordinate grid present on the map (Photo 2)

enter image description here

I tried many projections, many coordinate systems and in the best case I get an offset of several hundred meters on my georeferencing

I tried with :

  • NAD27(CGQ77)/UTM zone 19N
  • NAD27/ UTM zone 19N
  • WGS84/ UTM zone 19N but without conclusive results

I must have missed a step, but I don't know which one.

Which projection and which coordinate system would you use to get the best result?

  • 1
    Is this data available online? can create a custom projection based on the info. What GIS software are you using?
    – Mapperz
    Commented Oct 20, 2022 at 16:19

1 Answer 1


This is just using the screenshot image: (if can have a higher resolution will be more accurate)

WGS 84 / UTM zone 21N

Using QGIS 3.26.2 Georeferencer

enter image description here

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