I'm working with QGIS 3.12, trying to create a basemap of a mine site in Alberta for an env sci related project. I downloaded the 20k ASCII DEM from Altalis and imported the .gnp layer; which is a collection of vector points with XYZ values and a FID.

The northings are all correct the eastings all put the point layer in Saskatchewan. The coordinates of the center of my map are going to be 445834 E 5698420.N, UTM 12N, but the eastings in the layer which I downloaded all start in the 70s. That said, the features all appear to line up with what I'm seeing on google earth, its just that their coordinates claim that these features are in Saskatchewan instead of Alberta. An example point from the .gnp below

FID 1098 X 708435.396 Y 5707399.9185 Z 904.11487

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    What is the Lat/Long of FID 1098? Can you post a link to where you got the DEM?
    – Pointdump
    Commented Nov 18, 2022 at 20:30
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    Welcome to GIS.se. Can you say what happens when you check points using gdaldem on the command line?
    – BradHards
    Commented Nov 18, 2022 at 21:30

1 Answer 1


From the metadata - the CRS is NAD_1983_10TM_AEP_Forest (EPSG:3400)

When brought into QGIS in this CRS, the data displays correctly:

enter image description here

  • I'm not sure why I wasn't grasping that yesterday but thank you.
    – Benkr
    Commented Nov 19, 2022 at 15:29

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