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VO From the Command-Line

VO From the Command-Line. Mike Fitzpatrick NOAO. Introduction. The Portals discussed yesterday show typical VO-access modes using the web. However, this isn’t easily scriptable (same is true for GUI applications). Saving results is done manually

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VO From the Command-Line

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  1. VO From the Command-Line Mike Fitzpatrick NOAO NVOSS 2008

  2. Introduction • The Portals discussed yesterday show typical VO-access modes using the web. • However, this isn’t easily scriptable (same is true for GUI applications). • Saving results is done manually • Data not easily saved for analysis in other environments • What we need are general VO client applications we can script NVOSS 2008

  3. VOClient Overview • Hides details of VO implementation from applications • Provides: • Hi-level, easy-to-use interface between applications and the distributed VO framework, • Client-side VO interfaces returning higher-level structures (like tables) rather than a service API, • Equivalent functionality in all supported languages • Caches entire result until queried by app NVOSS 2008

  4. Python Java IRAF,IDL, etc. VOCLIENTD dalclient registry, etc. Architecture • Modeled after database server • VOClient Daemon • Multi-threaded • Java access to VO svcs • Layered on DAL, Registry and services • API • C-based, custom and SWIG bindings • Communicates w/ voclientd using proprietary RPC protocol • Connection Oriented • Allows voclientd to maintain state on behalf of client Other… NVOSS 2008

  5. API Example voc_initVOClient (config_opts) voc_closeVOClient (shutdown_flag) query = voc_regQuery (term, orValues) voc_regAddSearchTerm (query, term, orValue) voc_regRemoveSearchTerm (query, term) count = voc_regGetSTCount (query) str = voc_regGetQueryString (query) res = voc_regExecute (query) str = voc_regExecuteRaw (query) NVOSS 2008

  6. From API to Apps VOSESAME • Name resolver using Sesame service (Simbad/NED) Configurable output, multiple inputs VOREGISTRY VO Registry search and resource resolution VODATA Uses capabilities of both of the above VO catalog and image access (spectra in progress) NVOSS 2008

  7. VO-CLI in NVOSS • Software in NVOSS_HOME$vo-cli directory • To build: % cd $NVOSS_HOME/vo-cli % make install This installs binaries in the package bin directory, to use these tools you must install to some directory in your path like the $NVOSS_HOME/bin % cp bin/* $NVOSS_HOME/bin % cp voclientd $NVOSS_HOME/bin % cp -r voclient.jars $NVOSS_HOME/bin NVOSS 2008

  8. VOSesame: Name Resolution Usage: vosesame [<flags>] [<objfile> | [<target> ...] ] • -a print all information about the object • -d print position in decimal degrees (default) • -e print position errors • -h print help summary • -n print object name • -t print object type • -s print position as sexagesimal coordinates • -v print verbose warning output • -i invert search to print unresolved objects • -f force Sesame svc invocation and ignore cached values • -o specify output file (default: stdout) • -A output an ASCII table of results (default) • -C output a CSV table of results • -T output a TSV table of results • -H output a table heading NVOSS 2008

  9. VOSesame: Examples 1) Print the coordinates of NGC4456 decimal degrees % vosesame ngc4456 186.960000 -30.120000 2) Print the sexagesimal coordinates of multiple objects include the type: % vosesame -st m31 00:42:44.31 +41:16:09.4 LINER 3) Print the decimal coordinates of those same objects listed in the file 'myobjs.txt', output as CSV, include a header, and print the id, coords, type: % vosesame -CHndt myobjs.txt #Name,DRA,DDEC,Type, m31,10.684625,41.269278,LINER m51,202.468208,47.194667,Seyfert_2 m99,184.706333,14.416778,HII_G : : : : NVOSS 2008

  10. VOSesame: Examples • Calculator Mode: % vosesame -nd m98 m98 183.45154 14.89944 [EOF] • Print the sexagesimal and decimal values for multiple user coords: % vosesame -s -c 12:30:0.0 -45:00:0.0 -c 187.5 2.05 12:30:00.0 -45:00:00.0 12:30:00.0 02:03:00.0 NVOSS 2008

  11. VORegistry: Registry Query/Resolve • Command-line query of the VO Registry • Two Major Modes: • Search (typical keyword search) • Resolve (ShortName/Identifier to something else) • List full resource record • List table metadata • Count matching records • Arbitrary ADQL searches • Constrain searches • Bandpass, Service Type or ContentLevel NVOSS 2008

  12. VORegistry: Examples 1) Find all services with radio data of Abell clusters. % voregistry -b radio abell 2) Find all resources that mention Keck, how many are image services? % voregistry -count keck % voregistry -t image -count keck NVOSS 2008

  13. VOData: Data Access • Multi-threaded queries (hundreds/min) • Simple names for resources (e.g. ‘2mass-xsc’ and not “ivo://irsa.ipac/2MASS-XSC”) • Various output formats (XML/ASCII/CSV/KML…) • Not complete in terms of what VOClient API provides • Callable from variety of scripting languages • Interacts with NVO Portal • Targeted for power users NVOSS 2008

  14. VOData: Usage vodata [<flags>] [ <resource> [[ <objname> [ <sr> ]]] ] vodata [<flags>] [ <resource> [[ <ra> <dec> [ <sr> ]]] ] vodata [<flags>] [ <url> ] NVOSS 2008

  15. VO-CLI • For all tasks, a ‘-h’ flag will print help • The voclientdwill be started automatically • Web interface allows you to experiment with options. Note the command being executed is printed. • So, what can we actually do with this?? NVOSS 2008

  16. Scavenger Hunt 1) How many image services currently provide data for the GOODS survey? NVOSS 2008

  17. Scavenger Hunt • How many image services currently provide data for the GOODS survey? Solution: % voregistry -t image goods % voregistry -count -t image goods NVOSS 2008

  18. Scavenger Hunt 2) Where can you get an HST 4350A image of the center of the HDF? NVOSS 2008

  19. Scavenger Hunt 2) Where can you get an HST 4350A image of the center of the HDF? Solution: % vodata -O hdf -eu HST.GOODS.Cutout \ "Hubble Deep Field" 0.01 • the file 'hdf.urls' will contain the acrefs, last image is the F435 • possible to use the "-get" flag to simply download them all, or elsepass the hdf.urls in to download NVOSS 2008

  20. Scavenger Hunt 3) How many Bautz-Morgan type II Abell clusters are within 20 degrees of the south pole? NVOSS 2008

  21. Scavenger Hunt 3) How many Bautz-Morgan type II Abell clusters are within 20 degrees of the south pole? Solution: % vodata -V -O - ivo://nasa.heasarc/abell 0.0 -90.0 20 | \ stilts tpipe ifmt=votable in=- \ cmd='select "bmtype == \"II\""' omode="count" NVOSS 2008

  22. Scavenger Hunt 4) How many of them are in the ROSAT FSC (within 10') NVOSS 2008

  23. Scavenger Hunt 4) How many of them are in the ROSAT FSC (within 10') Solution: Regenerate the data query, but save results: % vodata -V -O - ivo://nasa.heasarc/abell 0.0 -90.0 20 | \ stilts tpipe ifmt=votable in=- \ cmd='select "bmtype == \"II\""' \ ofmt=votable out=bmII.xml Submit to Inventory, looking for ROSAT catalogs: % vodata -I -rm 10 any bmII.xml | grep ROSAT total of only 4 clusters match. Query the RASS FSC for the data: % vodata -O - -A -rm 10 RASS/FSC bmII.xml We see that one of the clusters (A3628) matches to 5 distinct X-ray sources, but in this tool we didn't crossmatch to the Abell number. (This could be done easily using STILTS, however) NVOSS 2008

  24. Scavenger Hunt 5) How many chromospherically active binaries are EUV sources … seen by the ROSAT WFC? …seen by EUVE? NVOSS 2008

  25. Scavenger Hunt 5) How many chromospherically active binaries are EUV sources? … seen by the ROSAT WFC? …seen by EUVE? Solution: Do a registry query to find the catalog and download it as an all-sky table: % voregistry chromospherically active binary % vodata -V -O sources ChrAcBin 0.0 0.0 180.0 Send it to Inventory and grep for results: % vodata -I -rs 10 any source.xml | egrep -i "rosat|euv" Second EUVE catalog shows 30 matches, WFC 2RE shows 9 matches NVOSS 2008

  26. Scavenger Hunt 6) How many stars with known exoplanets have been observed by ST? Solution: - Try to find a catalog in the Registry: % voregistry -R exoplanet - Access the entire table and send it to Inventory: % vodata -O planets -V J/ApJ/646/505 0.0 0.0 180.0 % vodata -I -rm 1 any planets_table2.xml | grep HST NVOSS 2008

  27. Scavenger Hunt 7)Write a script that will show you the rough number of HST, Chandra and Spitzer observations at a given location. NVOSS 2008

  28. Scavenger Hunt 7)Write a script that will show you the rough number of HST, Chandra and Spitzer observations at a given location. Solution 1: vodata -n hst $1 $2 .02 2>/dev/null | grep hst vodata -n spitzer $1 $2 .2 2>/dev/null | grep spitzer vodata -n chandra $1 $2 .2 2>/dev/null | grep chandra When given 3c273 as the object this gives: hst 238 C Hubble Space Telescope spitzer 23 C Spitzer Space Telescope Observation Log chandra 35 I Chandra X-Ray Observatory Data Archive NVOSS 2008

  29. Scavenger Hunt 7)Write a script that will show you the rough number of HST, Chandra and Spitzer observations at a given location. Solution 2: #!/bin/csh -f vodata -n hst,chandra,spitzer $1 $2 $3 |& grep -v -e "#" NVOSS 2008

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