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 Fig. 9 Aladin display panel. In the left column (pointed at by the red arrow) the ASTRON HiPS services are shown, witg LoTSS DR2 (high-resolution) shown. The middle panel shows the HiPS of this survey. In the right column is the "stack" which shows the loaded data sets (in this case only LoTSS DR1). Click for a bigger image. |
Images
The SIA and TAP services are also available directly from Aladin. First of all, load a HiPS (any HiPS will do; but it may be useful to use the HiPS from the same data release). To find the images, you can select Others → SIA → astron.nl → <data collection name> (purple directory icons). When double-clicking the collection (or clicking t he Load button) the popup screen. On top of the HiPS image, small shapes will appear that each represent the central pointing of each of the images (see Fig. 10; left). Note that the default colour of the shapes is red but the colour in the screenshot has been changed for contrast. When clicking one of the shapes the meta data of the selected object appears in a table below the figure and clicking on the image URL will then initiate a download of the original image, superimposing it on top of the HiPS (Fig. 10; right). Note that the stack on the right of the Aladin screen shows all loaded layers and that the layer in which the image was loaded is showing the percentage of the image loaded.
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Fig. 10 Selection of one of the ASTRON SIA services. Left sh Click for a bigger image. |
Catalogues
Catalogues
The Apertif DR1 VO data collection can also be discovered directly via ALADIN either via simple image access protocol (SIAP) or tabular access protocol (TAP). The examples shown here require the desktop version of ALADIN.
Open ALADIN and on the left panel for SIAP: select Others > SIA2 > astron.nl > The VO @ASTRON SIAP Version 2. Alternatively for TAP select Others > TAP > astron.nl > The VO @ASTRON TAP service (Fig. 49). A pop-up window will open. Click load, and enter a query using the Server selector (Fig. 50) or TAP access with astron.nl/tap (Fig. 51) to select the target of interest for SIAP and TAP respectively.
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 Fig. 50 ALADIN server selector panel for SIAP. Click for a bigger image. |
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After loading, the data collection catalogues can be plotted on the main panel by selecting them first on the right panel (e.g. highlighted in blue in Figures 14 and 15) and then by selecting the regions of interest on the bottom panel as shown in Figures 14 and 15. From here the usual functionality of ALADIN can be used.
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 Fig. 52 Example of data collection selection via SIAP in ALADIN. Click for a bigger image. |
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