SkyServer及其CasJob.ppt

1、SDSS SkyServer及其CasJob,李丽丽 中国虚拟天文台研发团队,Chinese Virtual Observatory,2006.10.29,VO Tutorial CAS 2006,2,Outline,SKyServer Tools SkyServer Display CasJobs CAsJobs Demo,2006.10.29,VO Tutorial CAS 2006,3,Introduction,SkyServer is provided the Web interface to the Catalog Archive Server (CAS) by SDSS CasJo

2、bs is a good tool in SkyServer, which allows you to submit unlimited queries and save the results to your own database on the server called MyDB,2006.10.29,VO Tutorial CAS 2006,4,SkyServer Data,Images : Pictures stored as .jpg or .fits Spectra: Graphs of light emitted by an object at different wavel

3、engths. study compositions, temperatures of objects, distances from Earth Photometric Data: quantities measured from an objects image, such as brightness, size Spectroscopic Data : quantities measured from an objects spectrum, such as spectral type, redshift,2006.10.29,VO Tutorial CAS 2006,5,SkyServ

4、er Tools,Famous Places: various beautiful images Get images: download images, spectra Scrolling sky: see how the sky looks to the SDSS telescope Visual Tools: visualize and explore detailed astronomical data in regions of the sky,2006.10.29,VO Tutorial CAS 2006,6,Search: search the database, includi

5、ng Radial, Rectangular, SQL, Imaging Query, Spectra Query Object Crossid: upload, crossID SpecList, Spectro CrossIdentification CasJobs: since SDSS DR2 allow SQL access to the SDSS databases,2006.10.29,VO Tutorial CAS 2006,7,CasJobs,Catalog Archive Server (CAS) Jobs System Provide access to object c

6、atalogs and ralated data Companion to Data Archive Server (DAS) allow user to download raw (FITS) images and spectra from survey,2006.10.29,VO Tutorial CAS 2006,8,Using Steps,Create an account and log in SQL Queries Submit jobs and wait for them to complete Queues for Running Queries and Waiting Extract data from tables and automatically download the output in MyDB,2006.10.29,VO Tutorial CAS 2006,9,MyDB,MyDB created as personal database on registration, create/alter/drop tables, functions and stored procedures. Getting data into MyDB Importing Data Into MyDB Downloading Data From MyDB extra