concat#
- Catalog.concat(other: Catalog, *, ignore_empty_margins: bool = False, **kwargs) Catalog[source]#
Concatenate two catalogs by aligned HEALPix pixels.
- Parameters:
- otherCatalog
Catalog to concatenate with.
- ignore_empty_marginsbool, default False
If True, keep the available margin when only one side has it (treated as incomplete). If False, drop margins when only one side has them. Defaults to False.
- **kwargs
Extra arguments forwarded to internal pandas.concat.
- Returns:
- Catalog
New catalog with OUTER pixel alignment. If both inputs have a margin — or if ignore_empty_margins=True and at least one side has it — the result includes a concatenated margin dataset.
- Raises:
- ValueError
If RA/Dec column names differ between the input catalogs, or between a catalog and its own margin.