Browsing and Visualization

The MAST Portal provides functionality to assess the applicability of search results to your scientific purpose. See the Portal Guide for details, including descriptions of the following: 

• See Browsing Data for a high-level view of manipulating search resultshow to navigate between multiple searches.
• See the Search Results Grid for tools that help you make use of browse observation metadata, or capture the results of a query as a persistent URL.
• Refining Results with Filters to augment the result selection criteriadown-select which results are presented.

Tools for browsing the content of data files are available via links embedded in each row of the table. Only tools that are applicable for the search result data type(s) have active buttons or links. See the following articles in the Portal Guide for extensive descriptions:

• See Data Browsing Tools
• Astroview (and see the following subsection)

One Portal tool in particular, the (1-D) spectrum viewer tool, does not currently work with JWST spectra. However, a web-based version of the Jdaviz tool can be used instead. See the Jdaviz summary below.

Browsing with AstroView

The search results page includes the AstroView Tool, which displays a region of a sky survey centered on the coordinates of the target. See Figure 1 below for a visual summary, and the Portal Guide chapter on AstroView for the detailed description.

• for options to display image thumbnails or cutouts, overlay an image on a sky survey, or view timeseries data.
• See the Astroview tool for displaying wireframes of search results superimposed on a sky survey

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Jdaviz for Portal Jdaviz for Portal

Visualization with Jdaviz 

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Figure 1 — AstroView Tool shows footprints of the searched observations next to the Filters and the table results. After successfully searching JWST observations, AstroView shows the footprints (green rectangles) of all retrieved JWST observations (including footprints from the instrument detector locations), as seen in Figure 1. Once an observation is selected in the List View tab (seen in the pink circle), the selected footprint is colored in white (in this image,  NIRCam). Multiple observations can be selected as well.

The primary aim of data visualization in the MAST Portal is to enable the discovery and selection of data that are relevant and of sufficient quality and depth to address the searcher's scientific goals.

AnchorJdaviz for Portal

This is particularly important for spectroscopic data. For JWST, which produces very advanced data products, a new more capable tool takes the place of the classic spectral viewer tool.

Jdaviz for PortalVisualization with Jdaviz 

JWST level 3 spectroscopic data products are available for quick-look and analysis in the web, using the Jdaviz package.  Follow this tutorial to learn how to view the default Minimum Recommended Product for an observation after performing a Portal Basic Search for Observations.  For more detailed documentation, see the complete Jdaviz in MAST (not yet available) guide.

Step 1: Perform a Portal Basic Search for Observations

Step 2: A new Jda action icon will displayed indicating that the current observation has data products viewable in Jdaviz (Figure 1

The following example illustrates how to invoke the Jdaviz tool in the Portal.

). 

	Instruction	Notes
1	Perform a Portal search by target or coordinates. A basic or advanced search work equally well.

See the Coming From the Portal page (not yet available) for more detailed information on navigation from the Portal basic and SI keyword search pages.

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2

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Figure 1 — The Jda Action icon (upper), indicating the observation row has data products viewable in Jdavi;. and the Action dropdown menu (lower) with options to display the default Minimum Recommended Product in Jdaviz, or to find all related data products associated with the observation that are viewable in Jdaviz.

A Jda action icon will appear for rows in the results table that are viewable with the Jdaviz tool.	Image Added
3	Click

Step 3: Click

the Jda action icon to reveal a dropdown menu, with

several

multiple options available.

  For this tutorial, we will focus on the first option.  

Select the first (default) option, which will display the default Minimum Recommended Product in Jdaviz.   For information on the second dropdown option, "Select which file to open", see the Finding Associated Data Products (link not yet available) page.

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Step

4

:

	Select the "Open default file" dropdown option

to

, which will open a new browser tab

,

and load the designated data product into the "Jdaviz in MAST" website

.  For example, in Figure 1, selecting option 1 for URI mast:JWST/product/

. The result will look something like the figure below. This specific example shows the file jw00212-o035_t007_miri_ch2-short_x1d.fits

will display a new page, as seen in Figure 2.

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Once

Panel
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Image Removed Figure 2 — The Jdaviz in MAST quicklook and analysis page, with displayed data product visualized in the Jdaviz Specviz configuration.

Step 5: Once loaded, the Jdaviz in MAST spectroscopic quicklook page can be used to quickly inspect a spectroscopic data product.  On the left-hand side is a sidebar panel of information.  In the center/right the data product is loaded into the Jdaviz application.  Jdaviz has different configurations optimized for different types of data products, i.e. 1d, 2d, or 3d spectroscopic data.  The example shown in Figure 2 above has loaded data into the ***Specviz*** configuration.  For a complete description of the quicklook page and the available Jdaviz configurations, see the Viewing Individual Spectra article (not yet available) for more details

For Further Reading...

• Portal Guide
• Browsing Data in the Portal
• Data Browsing Tools in the Portal
• Jdaviz in MAST (not yet available)