tcopy usage scenarios

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tcopy usage scenarios
Interoperability!

• The VO is a heterogeneous environment
• Convert from legacy formats to FITS/VOTable
• Adapt VOTable data to formats suitable for legacy
  tools
• Populate SQL databases from FITS files
• ... or vice versa
• Provide choice of output format for table query
  output
• put tcopy as a layer between standard output and
  what gets delivered to the user
• easy to write an HTML form providing output
  format options
• or a web service parameter naming chosen format

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tpipe expression language

• Algebraic expressions in terms of existing
  columns
• Used for row selection, defining new synthetic
  columns
• Refer to existing columns by column name or index
• Normal arithmetic/relational operators plus
  useful functions
• trigonometry, string handling, coordinate
  conversion, conditionals, ...
• Null value handling supported
• Compiled to Java bytecode at runtime (uses JEL)
• Fast execution
• Full power of Java language
• Extensible by supplying own classes at runtime

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tpipe examples

• Display first few rows of table
• tpipe survey1.xml -head 5
• Select rows on algebraic expression
• tpipe cat.fits -select 'BMAG lt 21.2
  startsWith(NAME,cyg)'
• -write catsub.fits
• Add new calculated columns
• tpipe -ifmt csv data.csv
• -addcol MAG_MEAN 0.5 (IMAG VMAG)
• -addcol IV_COLOUR VMAG - IMAG
• Convert columns from sexagesimal to degrees
• tpipe -ifmt csv acat.csv
• -addcol RA 'radiansToDegrees(hmsToRadians(
  1,2,3))'
• -addcol DEC 'radiansToDegrees(dmsToRadians(
  4,5,6))'
• -delcols '1,2,3,4,5,6'
• Calculate and display statistics on sample of
  large table
• tpipe USNO-B.FITS
• -every 1000000
• -stats
• Display the thousand highest redshifts in TOPCAT

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tmatch

• ... maybe one day

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TOPCAT VO features

• Load/Save dialogues
• Filestore browser
• Cone search
• SIAP query
• Registry query
• Activation actions
• Display images/spectra corresponding to table rows

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Filestore Browser

• Looks like standard file chooser
• Remote filespaces are available in the same way
  as local filesystem
• Log in/out to view remote filespaces
• Both load and save are available
• Pluggable framework for filespace implementations
• Currently MySpace and SRB supported
• Not hard to add new ones
• Available as separate library component for use
  in other applications

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Activation actions

• Can configure some action when table row is
  activated
• Activation performed by
• clicking on row in table display
• clicking on point in plot
• Actions include
• display cutout image from service (SoG)
• display spectrum from service (SPLAT)
• ... or anything you like

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Starlink SPLAT for the VO
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SPLAT features

• Not just a VO client, also an analysis tool with
  extensive graphics features, printing, zooming,
  scrolling etc.
• Source code available under GPL.
• Available as a desktop or webstart application
  (Linux, Windows, Mac OS X and Solaris).
• http//www.starlink.ac.uk/splat-vo

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New SSAP Browser

• Various interactive features object name lookup,
  RA and Dec in natural units (hh/dddmmss.s).
  Simple double click to load a spectrum.

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Double click download
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Starlink AST

• All coordinate and units transforms provided by
  AST.
• Spectral coordinates cover FITS-WCS paper III
• Wavelength, Frequency, Energy and Velocity
• Flux units, based only on interpretation of
  standard FITS-WCS paper I descriptions
• Jy, W/m2/Hz, W/m2/Angstrom, W/cm2/um,
  erg/cm2/s/Hz, erg/cm2/s/Angstrom

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Composite plot of VO data
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3C273 all frequencies
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Summary

• STILTS
• tcopy - table format conversion
• tpipe - table pipeline processor
• TOPCAT VO features
• local/remote filestore browser
• passable SIAP/Cone search service client
• SPLAT-VO
• Spectral analysis program, SSAP client,
  sophisticated coordinate handling
• Other items not mentioned here
• The future is uncertain...