compare_objects

lsst.analysis.ap.compare_objects(query1, query2, match_radius=0.5)

Compare two APDB datasets by spatially crossmatching diaObjects.

Parameters

query1lsst.analysis.ap.DbQuery

DbQuery to first APDB (postgresql or slite file; NOT created in this function).

query2lsst.analysis.ap.DbQuery

DbQuery to second APDB (postgresql or slite file; NOT created in this function).

match_radiusdouble

Maximum allowable distance in arcsec between an object in data1 and data2.

Returns

unique1pandas.DataFrame

Data frame of diaObjects only found in the first dataset.

unique2pandas.DataFrame

Data frame of diaObjects only found in the second dataset.

matchedpandas.DataFrame

Data frame of matched diaObjects; the rows are objects from the first dataset, with two columns added: obj2_diaObjectId pointing to the matched diaObjectId in the second dataset, and xmatch_dist_arcsec giving the on-sky separation in arcseconds.