1. October 12, 2003ADASS NVO Tutorial1 How-To Implement Cone and SIA Services http://www.us-vo.org/standards.html Gretchen Greene Space Telescope Science Institute T HE US N ATIONAL V IRTUAL O BSERVATORY

2. October 12, 2003ADASS NVO Tutorial2 First Standard for VO CONE service –Circular area query to a catalog –HTTP GET –Returns VOTable –Requires ?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)

3. October 12, 2003ADASS NVO Tutorial3 Sample Cone Search VOTable FOR SR=0 you will see FIELD. i.e. metadata info only

4. October 12, 2003ADASS NVO Tutorial4 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

5. October 12, 2003ADASS NVO Tutorial5 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.

6. October 12, 2003ADASS NVO Tutorial6 SIAP VOTable Example Shows image URL embedded in VOTable field May contain Multiple image URLs

7. October 12, 2003ADASS NVO Tutorial7 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

8. October 12, 2003ADASS NVO Tutorial8 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

9. October 12, 2003ADASS NVO Tutorial9 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

10. October 12, 2003ADASS NVO Tutorial10 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

11. October 12, 2003ADASS NVO Tutorial11 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