Weir, N. and Djorgovski, S. and Fayyad, U. and Smith, J. D. and Roden, J. (1994) Cataloging the Northern Sky Using a new Generation of Software Technology. In: Astronomy from Wide-Field Imaging. International Astronomical Union. No.161. Springer , Dordrecht, pp. 205-212. ISBN 978-0-7923-2879-7. https://resolver.caltech.edu/CaltechAUTHORS:20190724-084632067
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Abstract
We have developed a system, called SKICAT, for producing, managing and analyzing catalogs from the digitized POSS-II survey. The system classifies and matches catalogs from multiple, overlapping plate scans as well as CCD calibration sequences; and it can be used for the scientific analysis of the resulting catalogs. It incorporates a number of novel machine-learning and AI tools, including the star/galaxy classification using decision tree algorithms. This results in star/galaxy separation accurate to 90% or better down to B_j, ∼ 21^m, i.e. ∼ 1^m above the plate limit The final catalog is expected to contain at least 5 x 10^7 galaxies and > 2 x 10^9 stars. We present preliminary results on galaxy counts from a test region near the NGP. We find a mild excess over the no-evolution models, smaller than previously found by the APM group. A search for z > 4 quasars and the two-point correlation analysis of this data set are in progress.
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Additional Information: | © 1994 Springer Science+Business Media Dordrecht. This work: was supported at Caltech in part by the NASA AISRP contract NAS5-31348, Caltech President's fund, and the NSF PYI award AST-9157412, and at the JPL under a contract with the NASA. The POSS-II is partially funded by grants to Caltech from the Eastman Kodak Co., the National Geographic Society, the Samuel Oschin Foundation, the NSF grants AST 84-08225 and AST 87-19465, and the NASA grants NGL 05002140 and NAGW 1710. We acknowledge the efforts of the POSS-II team at Palomar, and the scanning team at STScl. We thank the conference organizers for a partial travel support, and an enjoyable meeting. | ||||||||||||||||||||||||
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Subject Keywords: | Decision Tree Algorithm; Stellar Object; Decision Tree Induction; Plate Scan; Object Catalog | ||||||||||||||||||||||||
Series Name: | International Astronomical Union | ||||||||||||||||||||||||
Issue or Number: | 161 | ||||||||||||||||||||||||
Record Number: | CaltechAUTHORS:20190724-084632067 | ||||||||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190724-084632067 | ||||||||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||
ID Code: | 97382 | ||||||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||||||
Deposited By: | Tony Diaz | ||||||||||||||||||||||||
Deposited On: | 24 Jul 2019 16:25 | ||||||||||||||||||||||||
Last Modified: | 12 May 2020 21:41 |
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