UCD_webivo://xaovo/ucd/q/queryXinjiang Astronomical Observatory,CASAuthor: Zhang Hailong, UCD Center2025-09-24T03:32:41ZZhang Hailong

150 Science 1-Street, Urumqi, Xinjiang 830011, China

zhanghailong@xao.ac.cn+86 18699134012IVOA UCD The Unified Content Descriptor (UCD) is a formal vocabulary astronomical data that is controlled by the International Virtual Observatory Alliance (IVOA). The vocabulary is restricted in order to avoid proliferation of terms and synonyms, and controlled in order to avoid ambiguities as far as possible. It is intended to be flexible, so that it is understandable to both humans and computers. UCDs describe astronomical quantities, and they are built by combining words from the controlled vocabulary.1983MPC..7759......https://data.xao.ac.cn/ucd/q/query/info The data List of UCD obtained from ucd1p-words-20070402.txt (http://cdsweb.u-strasbg.fr/UCD/).ucd The Unified Content Descriptor (UCD) is a formal vocabulary astronomical data that is controlled by the International Virtual Observatory Alliance (IVOA). The vocabulary is restricted in order to avoid proliferation of terms and synonyms, and controlled in order to avoid ambiguities as far as possible. It is intended to be flexible, so that it is understandable to both humans and computers. UCDs describe astronomical quantities, and they are built by combining words from the controlled vocabulary.ucd.data The Unified Content Descriptor (UCD) is a formal vocabulary astronomical data that is controlled by the International Virtual Observatory Alliance (IVOA). The vocabulary is restricted in order to avoid proliferation of terms and synonyms, and controlled in order to avoid ambiguities as far as possible. It is intended to be flexible, so that it is understandable to both humans and computers. UCDs describe astronomical quantities, and they are built by combining words from the controlled vocabulary.ucdUnified Content Descriptors from IVOAcharnullableucd_descThe simple explaination of UCDcharnullable