switch to polygon from bbox - #10
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Polygon, box and gpd are already imported in the earlier cell, and the remaining cartopy/geopandas/matplotlib imports are now sorted. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Whitespace-only change to satisfy `ruff format --check`. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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This pull request replaces the bbox-based HEALPix coverage with a polygon-based coverage using user-defined vertices.
Because HEALPix uses hierarchical spherical cells, the selected storage area does not need to be constrained to a rectangular bounding box. Using polygon vertices allows us to describe the area of interest more precisely, especially for coastal regions with irregular shapes.
As a result, fewer irrelevant cells are selected outside the target region, which helps reduce disk storage usage while preserving the required spatial coverage.