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J/A+A/547/A115       ASPECT - A spectra clustering tool       (in der Au+, 2012)

ASPECT - A spectra clustering tool for exploration of large spectral surveys in der Au A., Meusinger H., Schalldach P. F., Newholm M. <Astron. Astrophys. vol, page (2012)> =2012A&A...547A.115I
ADC_Keywords: Galaxies, spectra ; Spectroscopy ; MK spectral classification Keywords: methods: data analysis - surveys - white dwarfs - stars: carbon - quasars: general Abstract: We present the novel, semi-automated clustering tool ASPECT for analysing voluminous archives of spectra. The heart of the program is a neural network in form of Kohonen's self-organizing map. The resulting map is designed as an icon map suitable for the inspection by eye. The visual analysis is supported by the option to blend in individual object properties such as redshift, apparent magnitude, or signal-to-noise ratio. In addition, the package provides several tools for the selection of special spectral types, e.g. local difference maps which reflect the deviations of all spectra from one given input spectrum (real or artificial). ASPECT is able to produce a two-dimensional topological map of a huge number of spectra. The software package enables the user to browse and navigate through a huge data pool and helps him to gain an insight into underlying relationships between the spectra and other physical properties and to get the big picture of the entire data set. We demonstrate the capability of ASPECT by clustering the entire data pool of 0.6 million spectra from the Data Release 4 of the Sloan Digital Sky Survey (SDSS). To illustrate the results regarding quality and completeness we track objects from existing catalogues of quasars and carbon stars, respectively, and connect the SDSS spectra with morphological information from the GalaxyZoo project. Description: C++ source code package for the clustering tool. It can be compiled under Windows using Visual Studio 2010 with support for 32 and 64 bit machines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file 0 . ASPECT C++ source code package

(End) Aick in der Au [Thueringer Landessternwarte Tautenburg] 13-Oct-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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