The 20k grid/tile layer from DataBC https://catalogue.data.gov.bc.ca/dataset/bcgs-1-20-000-grid has a northern boundary of 60deg N.
The BC Boundary file that defines the provincial border has a northern boundary that is close but not exactly at 60degN, it is generally a few metres farther north.
Since inputs are cut by tile to speed processing, some area is lost. The effect is very minor (especially as there are few if any designated lands in this gap) but the difference is noticeable when calculating total areas.
The 20k grid/tile layer from DataBC
https://catalogue.data.gov.bc.ca/dataset/bcgs-1-20-000-gridhas a northern boundary of 60deg N.The BC Boundary file that defines the provincial border has a northern boundary that is close but not exactly at 60degN, it is generally a few metres farther north.
Since inputs are cut by tile to speed processing, some area is lost. The effect is very minor (especially as there are few if any designated lands in this gap) but the difference is noticeable when calculating total areas.
To fix, nudge the northernmost tile boundaries up by ~250m in this step https://github.com/bcgov/designatedlands/blob/master/sql/create_tiles.sql