I am new to QGIS.
I am trying to import a shapefile (project boundary) into QGIS but when it asks for the CRS I can't find the zone (35) for Finland (in NAD 83).
What am I doing wrong?
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North American Datum 1983 and WGS 84
The initial definition of NAD 83(1986) was intended to match GRS 80 and WGS 84, so many older publications indicate no difference. Subsequent measurements found a difference on the order of a meter over much of the United States. Each datum has undergone refinements with more accurate and later measurements.
NAD 83 is defined to remain constant over time for points on the North American Plate, whereas WGS 84 is defined with respect to the average of stations all over the world. Thus the two systems naturally diverge over time. For much of the United States the relative rate is on the order of 1 to 2 cm per year. Hawaii and the coastal portions of central and southern California west of the San Andreas Fault are not on the North American plate, so their divergence rate differs.
Since you are working on Finnish data, I think you should go for the WGS 84. Then, go for
EPSG:32635, WGS 84 / UTM zone 35N