1 / 11

How-To Implement Cone and SIA Services http://www.us-vo.org/standards.html

T HE US N ATIONAL V IRTUAL O BSERVATORY. How-To Implement Cone and SIA Services http://www.us-vo.org/standards.html. Gretchen Greene Space Telescope Science Institute. First Standard for VO. CONE service Circular area query to a catalog HTTP GET Returns VOTable Requires

crete
Download Presentation

How-To Implement Cone and SIA Services http://www.us-vo.org/standards.html

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. THE US NATIONAL VIRTUAL OBSERVATORY How-To Implement Cone and SIA Services http://www.us-vo.org/standards.html Gretchen Greene Space Telescope Science Institute ADASS NVO Tutorial

  2. First Standard for VO • CONE service • Circular area query to a catalog • HTTP GET • Returns VOTable • Requires • <BaseURL>?RA=....&DEC=....&SR= • Optional verbs allowed (see example below) • Cone Service metadata retrieval • SR=0 • Example (used in Galaxy Morphology NVO Demo) http://nedwww.ipac.caltech.edu/cgi-bin/nph-nedconez?RA=194.95305&DEC=27.98069&SR=0.8&TYPE=G&ZMIN=0.01&ZMAX=0.03 • Prototype service registries available • http://sdssdbs1.stsci.edu/nvo/registry/index.aspx • http://rai.ncsa.uiuc.edu/nvoregistration.html (OAI) ADASS NVO Tutorial

  3. Sample Cone Search VOTable FOR SR=0 you will see FIELD. i.e. metadata info only ADASS NVO Tutorial

  4. Simple Image Access Protocol (SIAP) • Specification for 4 types of image services and archives • CUTOUT service • MOSAIC service • ATLAS archive • POINTED archive • HTTP Get for rectangular Region of Interest (ROI) • MUST specify in decimal degrees • POS (ROI center) • SIZE (Angular width) • Like the Cone Service SIAP returns VOTable • Example http://cadcwww.hia.nrc.ca/cadcbin/cadcImageQuery.pl?CAT=CNOC1&POS=245.9085,26.540&SIZE=0.05,0.05 ADASS NVO Tutorial

  5. SIAP – continued • For compliance each service • MUST: perform ROI query and return a URL to image • OPTIONAL: image staging, image retrieval (GetImage) • Other MUSTs include • FORMAT to indicate desired format of referenced image (e.g. FITS, JPG, GIF) • http://cxc.harvard.edu/cgi-gen/astrobrowse/bin/ cda/SIAP.pl?POS=194.95,27.967 &FORMAT=image/fits&GRADE=TOP&SIZE=0.1 • Metadata accessed with FORMAT=METADATA • Specific UCD fields (see standards doc for complete listing) • POS_EQ_RA_MAIN, POS_EQ_RA_DEC • VOX:Image_Title, VOX:Image_Naxes …. (where VOX = VO-Experimental and are non-standard) • Optional Image Generation Parameters (IGP) are permitted • WCS strongly encouraged for overlay rendering of images • CRPIX, CRVAL, etc. ADASS NVO Tutorial

  6. SIAP VOTable Example • Shows image URL embedded in VOTable field • May contain Multiple image URLs ADASS NVO Tutorial

  7. Basic Development Steps • After initial assignment of UCDs to returned parameters and table values… • Code back-end to get data • LOAD data and params into VOTable • Use existing VOTable tools (e.g. JAVOT) • Do-it-yourself • Create cgi, web app, or web service and register with prototype registries • Caltech • NCSA • STScI/JHU • More to come ADASS NVO Tutorial

  8. MAST Cone Search (PHP) • MAST retrieval of HST instrument data • PHP (server-side scripting language) • Same code that performs mission searches used for cone search • Sample Query http://archive.stsci.edu/hst/search.php?sci_data_set_name=J*&RA=148.88&DEC=69.065&SR=0.05 Contact: Randy Thompson rthomp@stsci.edu ADASS NVO Tutorial

  9. GALEX Cone Search (.NET) • Implemented as Web Service (using .NET) • service development compatible with any standard SOAP client • Unrestricted language access (JAVA, Perl, e.g.) • .NET provides standard http get (SDSS cone service) http://skyservice.pha.jhu.edu/devel/ConeSearch/sdssConeSearch.asmx/ConeSearch?ra=180.0&dec=1.0&sr=0.05 Contact: Alberto Conti aconti@stsci.edu ADASS NVO Tutorial

  10. DSS SIAP (Java Server Page) • Retrieval of DSS Image References • Calculates WCS Info • Implemented as JSP • Example URL http://chart.stsci.edu/gscvo/DSS2.jsp?POS=120.0%2C65.8&FORMAT=image%2Ffits&SIZE=0.05 • Uses Resin Java Servlet Engine with Apache ADASS NVO Tutorial

  11. Scaling DAL for Science Application • Galaxy Morphology Demo • one of the first prototypes using DAL standards • Merging science with new VO computing technology • Portal integrated DAL services with preset registry of resources • Accessed Grid computational Web Service • would be simplified by implementing VO Registry • mine resource metadata • Standard query support ADASS NVO Tutorial

More Related