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Using the DaCHS interface can be useful for users but the advantage of using a standard is that generic tooling can be used to query and access the data. Two very well-known tools are TOPCAT and Aladin. We will give an overview
Access via TOPCAT
The VO data collections can easily beThe Apertif DR1 data collection tables can be accessed using TOPCAT, an interactive graphical viewer and editor for tabular data. Since the ASTRON VO is regsitered to the so-called registry of registries, TOPCAT can find the relevant services in its query menus. In the VO menu of TOPCAT you can pick the SIA query menu item, which will bring up a form as shown in Fig. 5. When selecting one of the data collections the SIA URL will be automatically filel in. One can then either type coordinates, or an object name and click the "Resolve" button which uses Simbad to obtain coordinates for that obiect. When clicking OK, a table of the data products found will appead appeared in the main TOPCAT window.
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Fig. 5: SIAP query form in TOPCAT, querying for data collections with LOFAR in the description, and querying for 15 arc seconds around IC 708 in LoTSS-DR1. |
Access to the tables (and the observant reader may realise here that the image data is also tabulated) in the ASTRON VO can be done using the TAP standard. The way to do this is very similar to SIA.
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First select TAP in the VO menu
HIER
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Fig. 6: TAP query form in TOPCAT, querying for data collections with LOFAR in the description, and querying for 15 arc seconds around IC 708 in LoTSS-DR1. |
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The data can be sent from vo.astron.nl to TOPCAT using one of the two protocols: SAMP or TAP. The two subsections below provide a description on how to access the tabular data using either SAMP(link to Send via SAMP subsection) or TAP(link to VO Table Access Protocol (TAP) subsection).
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Overview
Content Tools
Tasks