Hao
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Hao
> It seems that you are computing the contours on the spherical coordinates, then project the resulting polygons. But this creates issues with the holes. If you changed the order...
In the data source(contours.json), masked area(land) is set -1e20. When I change -1e20 to -999, the chart becomes perfect. I don't know why this value affect the contour polygons.