Crossmatch:the NRAO Cross-identifcation

Service

Jared Crossley

Data Archive Access Meeting - Socorro, NM - 5 April 2010

the GoalProvide a way for astronomers to easily find complementary data in multiple telescope archives.

the Motivation• Astronomers who work at other wavelengths

have requested VLA data to complement their own data sets.

• Increase accessibility of archival data, especially pre-processed data.

Upshot for Archive Access

• The application I’m developing may demonstrate a nice user interface to archival data.

• Highlights the relevance of multi-archive & multi-wavelength data access.

• Demonstrates the usefulness of VO tools and standards.

Accessing Multiple Archives

• A standard protocol for obtaining archival metadata: VO Simple Cone Search (SCS).

• SCS is intended to provide catalog data, but some services distribute archival metadata instead.

• For lack of a better alternative, use SCS.

The Application

Crossmatch consists of 3 parts:1. Static web content (HTML & JavaScript);

provides a query page for data searches and a framework for VOView.

2. VOView: a client-side VO app that provides a web browser user interface to VO Table data.

3. A proxy service; allows the user to acquire data from other domains

VOView

• Designed as an efficient interface to VO Tables with 1000 to 100,000 rows.

• Uses XSLT to quickly process data• Provides:

Pagination, Sorting, Filtering, Dynamic column re-ordering, showing/hiding columns, easily export data (XML, ASCII, …), Display column units, datatypes, & descriptions

Demo

http://webtest.aoc.nrao.edu/jcrossle/crossmatch/

To-do List

• Collapse partially redundant rows

• Link table rows directly to archive data

• Increase interactivity between display windows (sorting, filtering, …?)