Imperial College London


Faculty of Natural SciencesDepartment of Mathematics

Senior Research Investigator



+44 (0)20 7594 2843d.j.hand CV




Mrs Agnieszka Damasiewicz Niccolai +44 (0)20 7594 2843




547Huxley BuildingSouth Kensington Campus






BibTex format

author = {Henrion, M and Mortlock, DJ and Hand, DJ and Gandy, A},
booktitle = {Springer Series in Astrostatistics},
doi = {10.1007/978-1-4614-3508-2_8},
pages = {149--184},
title = {Classification and Anomaly Detection for Astronomical Survey Data},
url = {},
year = {2013}

RIS format (EndNote, RefMan)

AB - © Springer Science+Business Media New York 2013. We present two statistical techniques for astronomical problems: a star-galaxy separator for the UKIRT Infrared Deep Sky Survey (UKIDSS) and a novel anomaly detection method for cross-matched astronomical datasets. The star-galaxy separator is a statistical classification method which outputs class membership probabilities rather than class labels and allows the use of prior knowledge about the source populations. Deep Sloan Digital Sky Survey (SDSS) data from the multiply imaged Stripe 82 region are used to check the results from our classifier, which compares favourably with the UKIDSS pipeline classification algorithm. The anomaly detection method addresses the problem posed by objects having different sets of recorded variables in cross-matched datasets. This prevents the use of methods unable to handle missing values and makes direct comparison between objects difficult. For each source, our method computes anomaly scores in subspaces of the observed feature space and combines them to an overall anomaly score. The proposed technique is very general and can easily be used in applications other than astronomy. The properties and performance of our method are investigated using both real and simulated datasets.
AU - Henrion,M
AU - Mortlock,DJ
AU - Hand,DJ
AU - Gandy,A
DO - 10.1007/978-1-4614-3508-2_8
EP - 184
PY - 2013///
SN - 9781461435075
SP - 149
TI - Classification and Anomaly Detection for Astronomical Survey Data
T1 - Springer Series in Astrostatistics
UR -
ER -