![Page 1: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/1.jpg)
The NVO Data Discovery Portal
Tom McGlynnNASA/GSFC
![Page 2: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/2.jpg)
Purpose of the Portal
• Get to science right away without worrying about protocols and such.
• Quick and convenient• Integrate Web and CLI analysis
![Page 3: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/3.jpg)
Issues
• Complexity of the VO• Different kinds of questions users have
Our solution:• Make the portal a suite of interacting
services rather than a single monolithic task.
![Page 4: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/4.jpg)
Portal elements
• What kind of data is there? (registry)• Poke around in a resource. (simple query)• What resources are there at my positions? (inventory)• Everything known about a given source (DataScope)• How can I use my data in the VO ?(table converter and
wizard)?• How can I combine information from multiple resources?
(Vim)• But I don’t want to have to use the web! (voclient)
![Page 5: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/5.jpg)
Portal home
![Page 6: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/6.jpg)
Portal Home (cont’d)
• http://heasarc.gsfc.nasa.gov/vo/portal– Move to us-vo.org
(or successor) later.
• Little bit of help documentation in the ‘tutorial’
![Page 7: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/7.jpg)
What kind of data is out there?
![Page 8: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/8.jpg)
Search
Filter
PageSaveSortRequery
Select The active response page
![Page 9: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/9.jpg)
Registry Advanced Search
![Page 10: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/10.jpg)
Poke around.
• Pick searchable service and click search button.
• Do all sky search if appropriate, or limited positional search.
• Filter results
![Page 11: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/11.jpg)
Send results to the table viewer (SimpleQuery)
![Page 12: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/12.jpg)
Another active results screen
![Page 13: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/13.jpg)
Chromospherically Active Binaries with G stars brighter than v=8
![Page 14: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/14.jpg)
Plotting
![Page 15: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/15.jpg)
What’s nearby?
• Go to inventory as result of search.
![Page 16: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/16.jpg)
Inventory
Correlation radius
New inputs
Limit services to be checked
Look at matches
![Page 17: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/17.jpg)
Inventory results
Select for examination
Size of catalog
Number of inputs matched
![Page 18: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/18.jpg)
View matches
![Page 19: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/19.jpg)
Build up information on a list of sources: VIM
Actions
Current table
![Page 20: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/20.jpg)
Cross-correlate with USNOB
Number of matches for each entry
![Page 21: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/21.jpg)
Compare tables
Some rows match more than one input entry.
![Page 22: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/22.jpg)
Larger scale requestsStatus box
![Page 23: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/23.jpg)
Image gallery with VIM
![Page 24: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/24.jpg)
What’s known about a given source?
![Page 25: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/25.jpg)
Some DataScope windows
![Page 26: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/26.jpg)
Handling user input lists
• User created lists• Lists downloaded from non-VO sources
![Page 27: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/27.jpg)
Table Wizard
![Page 28: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/28.jpg)
![Page 29: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/29.jpg)
The table wizard creates the VOTable for you, but currently you need to manually stripe it into a file or other service to use it.
![Page 30: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/30.jpg)
Table converter
![Page 31: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/31.jpg)
Converter outputs
![Page 32: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/32.jpg)
Wizard versus converter
• Wizard – is interactive– lets user see how conversion is done– requires data to be striped in and out.
• Converter – uses files– can send data to other services– will do name resolution of target names.– no interactive input, may get confused by
complex files
![Page 33: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/33.jpg)
Off the Web: VOClient
• Three main tasks:– VORegistry: query the registry for data
resources– VOData: Query the data resources– VOSesame: Convert names to coordinates
• Can interchange lists of sources and data resources with portal Web pages.
![Page 34: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/34.jpg)
… and it can be used from the Web too!
![Page 35: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/35.jpg)
VORegistry Example
![Page 36: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/36.jpg)
VOData example
![Page 37: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/37.jpg)
VOClient usage
• Use Web pages to see examples and try out usage.
• Use on the command line for repeated and operational use– Long commands
• VOClient can create lists for use in simple query, inventory or VIM.
• Download your own copy from: http://iraf-nvo.noao.edu/vo-cli/downloads/index.html
![Page 38: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/38.jpg)
After starting in the portal…
• TOPCAT or VOPLOT: Display and manipulate tables of results
• Aladin: Compare images and tables• Use specialized features of discovered
resources• Data mining in VIM, OpenSkyQuery,
WESIX or other tools• Publish results• …
![Page 39: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/39.jpg)
Summary
• Portal is a set of services which each specialize in one area, but have a lot of overlap– More than one way to do things– Transition from one service to another can happen at
different locations
• Services communicate by passing:– Lists of sky positions the user is interested in– Lists of data resources the user might wish to search
• Quick response to allow users to refine and augment queries.
![Page 40: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/40.jpg)
Scavenger hunt
• Using the portal services can you answer these:
1. Find how many image services currently provide data for the GOODS survey?
2. Find where can you get an HST 4350A image of the center of the Hubble Deep Field? [Note that the GOODS fields include HDF and Hubble Deep Field is recognized by Simbad as a valid name.]
3. Determine how many Bautz-Morgan type II Abell clusters are within 20 degrees of the south pole?
4. See how many of them are in the ROSAT FSC (within 10')
5. A burst goes off at 01 23 45, -54 32 10. What’s known about that location?
6. Learn how many chromospherically active binaries are EUV sources ?
7. See how many stars with known exoplanets have been observed by ST? [see data link on schedule for a list of exoplanets].
8. Write a script that will show you the rough number of HST, Chandra and Spitzer observations at a given location.
![Page 41: The NVO Data Discovery Portal Tom McGlynn NASA/GSFC](https://reader033.vdocuments.us/reader033/viewer/2022052820/5514d7c755034640138b63e9/html5/thumbnails/41.jpg)
Caveats:
• Limited bandwidth to hotel.• Some VO resources may not handle
~50 simultaneous requests