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Tripolar lines in velocity plot - Arctic view #53
as seen in this screen grab, there are lines are visible in the pole projection. this seems to be the result of a misinterpretation of the around the pole possibility because of the tripolar projection used in the GIOPS data.
and as can be seen here the arrows do not line up as expeced around the lines.
changed the title from
lines in velocity plot - Arctic view
Tripolar lines in velocity plot - Arctic view
Jan 8, 2018
The tripolar lines are an artifact of the rotation of the GIOPS grid lines. Above about 40 deg N, the x grid lines are no longer aligned east/west.
We can correct this issue by calculating the angle between the xgrid lines and east, and then rotating the velocity fields upon loading. The angle can be computed once for each grid and saved in a netcdf file listed in the model's config file.