index_and_grow_mask#

smart.indexed_grown_mask.index_and_grow_mask(current_map: <sunpy.map.map_factory.MapFactory object at 0x7ff1d3e39a80>, rotated_map: <sunpy.map.map_factory.MapFactory object at 0x7ff1d3e39a80>, dilation_radius: ~astropy.units.quantity.Annotated[~astropy.units.quantity.Quantity, Unit("arcsec")] = <Quantity 5. arcsec>)[source]#

Performing Indexing and Growing of the Mask (hence the name IGM).

Transient features are removed by comparing the mask at time ‘t’ and the mask differentially rotated to time ‘t’. ARs are then assigned ascending integer values (starting from one) in order of decreasing size.

Parameters:

current_map (Map) – Processed magnetogram map from time ‘t’.
rotated_map (Map) – Processed magnetogtam map from time ‘t - delta_t’ differentially rotated to time t.
dilation_radius (int, optional) – Radius of the disk for binary dilation (default is 2.5 arcsecs).

Returns:

sorted_labels – Individual contiguous features are indexed by assigning ascending integer values (beginning with one) in order of decreasing feature size.

Return type:

ndarray