VOSpec: A Tool for Handling Virtual Observatory Compliant Spectra
VOSpec: A Tool for Handling Virtual Observatory Compliant Spectra
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VOSpec：处理虚拟天文台兼容光谱的工具
DOI：
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发表时间：
2005
期刊：
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通讯作者：
C. Arviset
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文献类型：
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作者：
P. Osuna;I. Barbarisi;J. Salgado;C. Arviset
在天文学界有许多光谱分析和显示工具。然而，需要一种“支持VO”的工具，可以在VO内以VO格式叠加来自不同项目的光谱。目前缺乏这样一种工具的主要原因之一是天文光谱不像图像那样被很好地定义。IVOA在试图定义简单频谱访问协议方面做出了重大努力，通过该协议解决了部分问题，给出了能够在VO上下文中处理频谱数据的规则。通过定义一个基于量纲分析的算法来叠加来自VO资源的光谱，我们ESAC已经能够创建一个工具来叠加VO光谱，并以特定的方式声明它们的元数据。为此，与VO SSAP兼容的资源只需要在其VOTable SSAP结果中提供三个新的额外字段，以便该工具能够叠加光谱。在撰写本文摘要时，ESAC正计划在IVOA上提出这三个额外的元数据字段，作为简单频谱接入协议定义中的可选输入。在这个演讲的时候，国际虚拟天文台联盟还没有发布简单频谱访问协议规范文件。2003年10月在斯特拉斯堡举行的IVOA研讨会上，ESAC提议纳入一个简单频谱接入协议，该协议与IVOA已经发布的简单图像接入协议（SIAP）非常相似，但适用于频谱接入。ESAC要求包括三个额外的参数，稍后会描述，以允许自动处理单位，这是天文光谱世界中永无止境的问题。VOSpec工具是根据IVOA将按照上述思路发布SSAP的假设构建的，我们认为这已经是事实。鉴于缺乏规范，我们将在这里描述我们如何理解简单频谱访问协议的基本机制，以及我们如何实现它以展示VOSpec工具的有用性和功能。为了通过SSAP访问谱，数据提供者必须实现一个服务，该服务接受具有以下基本输入参数的调用：POS和198
There are lots of tools for spectra analysis and display in the astronomical community. However, there is a need for a “VO-enabled” tool that can superimpose spectra coming from different projects within the VO and in VO-format. One of the main reasons for the current absence of such a tool is the fact that astronomical spectra are not as well defined as, e.g., images are. The IVOA has made a significant effort in trying to define a Simple Spectral Access Protocol by which part of this problem is solved, giving the rules to be able to handle spectral data in the VO context. By defining an algorithm based on dimensional analysis for the superimposition of spectra coming from VO resources, we at ESAC have been able to create a tool that can superimpose VO spectra that declare their metadata in a specific way. To do this, VO SSAP-compatible resources will only have to give three new extra fields in their VOTable SSAP results for the tool to be able to superimpose the spectra. At the time of writing this abstract, the ESAC is planning to propose these three extra metadata fields for acceptance at the IVOA as optional inputs in the definition of the Simple Spectral Access Protocol. 1. Access to Spectra in the Virtual Observatory context: the Simple Spectrum Access Protocol At the time of this presentation, the International Virtual Observatory Alliance has not published yet the Simple Spectrum Access Protocol specification document. ESAC proposed in the IVOA Workshop held in Strasbourg in October 2003 the inclusion of a Simple Spectrum Access Protocol that would be very much like the Simple Image Access Protocol (SIAP) already published by the IVOA but suited for Spectrum access. ESAC was asking for the inclusion of three extra parameters, to be described later, to allow for the automatic handling of units, a never-ending problem in the astronomical spectrum world. The VOSpec tool was built following the assumptions that the IVOA would publish an SSAP along the lines described above, which we believe is already the case. In view of the absence of a specification, we will describe here how we understand the basic mechanism of the Simple Spectrum Access protocol and how we have implemented it to show the usefulness and functionality of the VOSpec tool. To access spectra through the SSAP, a data provider has to implement a service that accepts a call with the following basic input parameters: POS and 198