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The Hierarchical Progressive Survey (HiPS) protocol defines a way to visualise sky surveys by breaking them up in different hierarchical views which represents different zoom levels. This makes it possible to scroll through a survey in a way that is comparable to using Google Maps (or other online mapping/satellite tools). ASTRONs HiPS collections are all available in Aladin and the most important ones are available through other tools, like ESASky. However users can also have direct access to all our HiPS collections through hips.astron.nl. Typically, HiPS projections are used to visually look through the data from a survey, and combine the coordinates with table-based services to obtain source information or data. The following table shows an overview of the ASTRON HiPS server contains the following data collections. Some collections are promoted in Aladin to be curated by CDS. The concrete meaning of this will be discussed in the Aladin part of this page.
| Collection name (and link) | Description | promoted |
|---|---|---|
| TGSS ADR | Yes | |
| Apertif DR1 | Apertif first Data Release (DR1) - Uncalibrated continuum flux | Yes |
| LoTSS DR1 low | Lofar Two-Metre Sky Survey (LoTSS) first data release (DR1) low resolution (20") | No |
| LoTSS DR1 high | Lofar Two-Metre Sky Survey (LoTSS) first data release (DR1) high resolution (6") | Yes |
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In particular, the protocols offered are the Tabular Access Protocol (TAP), Simple Application Messaging Protocol (SAMP) and the Simple Image Access protocol (SIA). TAP and SAMP enables queries to explore the data in a tabular form using tools such as TOPCAT. TOPCAT is an interactive graphical viewer and editor for tabular data, it enables the interactive exploration of large tables performing several types of plotting, statistics, editing and visualization of tables. SIA enables the rapid display of images and cubes through all sky atlas tools such as ALADIN. ALADIN is an interactive sky atlas allowing the user to visualize digitized astronomical images/cubes and superimpose entries from astronomical catalogues or databases.
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The data published in the VO can also be accessed using a web browser at https://vo.astron.nl. This web interface provides a page on which all the collections present in the registry are listed, including the published LoTSS DR2 data sets:
ADQL Query
LBCS Calibrator Search
LoLSS - Image Cutout Service
LoLSS source catalog
LoTSS-DR1 Cross-Matched Source Catalogue
LoTSS-DR1 Image Archive
LoTSS-DR1 Image Cutout Service
LoTSS-DR1 Raw Radio Catalogue Cone Search
LoTSS-PDR Image Archive
LoTSS-PDR Image Cutout Service
LoTSS-PDR Source Catalogue
M) Apertif DR1 - Continuum images
M) Apertif DR1 - HI spectral cubes
M) Apertif DR1 - Polarization images and cubes
MSSS Verification Field Images
MSSS Verification Field Sources
S) Apertif DR1 - Field calibrated visibilities
S) Apertif DR1 - Field raw visibilities
S) Apertif DR1 - Flux calibrator raw visibilities
S) Apertif DR1 - Pol. calibrator raw visibilities
SAURON HI Survey Images
SAURON HI Survey Velocity Fields
TGSSADR Image Archive
TGSSADR Image Cutout Service
TGSSADR Source Catalogue
The VO @ ASTRON TAP service
| Service name | Service Description | Type | Link to column descriptions |
|---|---|---|---|
LoTSS-DR2 Gaussian catalog cone search | catalog | info | |
| LoTSS-DR2 Source catalog cone search | |||
| LoTSS-DR2 mosaics | image |
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