pvtend.crop_contour_to_patch

pvtend.crop_contour_to_patch(contour: dict, centre_lat: float, centre_lon: float, half_dlat: float = 21.0, half_dlon: float = 36.0) → dict | None[source]

Crop a circumpolar contour to an event-centred patch, returning relative coordinates (Δlon, Δlat).

Parameters:

  • contour – Dict with ‘lev’, ‘lon’, ‘lat’ from circumpolar_contours.

  • centre_lat – Patch centre in geographic coords.

  • centre_lon – Patch centre in geographic coords.

  • half_dlat – Half-extents of patch (degrees).

  • half_dlon – Half-extents of patch (degrees).

Returns:

Dict {'lev', 'x', 'y'} in relative coordinates, or None if too few points survive the crop (< 10).