An Astronomical Image Mosaic Service for theNational Virtual .ppt

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1、An Astronomical Image Mosaic Service for the National Virtual Observatory http:/montage.ipac.caltech.edu,Les Montagiers,Bruce Berriman IPAC Attila Bergou JPL Ewa Deelman ISI John Good IPAC Joseph Jacob JPL Daniel Katz JPL,Carl Kesselman ISI Anastasia Laity IPAC Thomas Prince Caltech Gurmeet Singh IS

2、I Mei-Hui Su ISI Roy Williams CACR,What is Montage?,Delivers custom, science grade image mosaics User specifies projection, coordinates, spatial sampling, mosaic size, image rotation Preserve astrometry use as a reprojection and co-registration engine Implemented in ANSI C for portability Public ser

3、vice will be deployed on the Teragrid Order mosaics through web portal,Public Release of Montage,Version 1.7.1 available for download at http:/montage.ipac.caltech.edu Users Guide including caveats Emphasizes accuracy in photometry and astrometry Images processed serially Tested and validated on 2MA

4、SS 2IDR images on Linux Red Hat 8.0 (Kernel release 2.4.18-14) on a 32-b it processor Tested on 10 WCS projections with mosaics smaller than 2 x 2 degrees and coordinate transformations Equ J2000 to Galactic and Ecliptic Code metrics 20 modules; 7560 Lines of code 2595 test cases executed; 119 defec

5、ts reported and 116 corrected,Applications of Montage,GLIMPSE SIRTF Legacy Team Large scale infrared mosaics of the Galactic Plane Co-registration of 2MASS J, H, K and MSX 8 m images Quality Assurance of GLIMPSE SIRTF data,Applications of Montage,SWIRE SIRTF Legacy team Wide area of imaging survey o

6、f high galactic latitude fields Evolution of stellar populations up to z=3 Co-registration of 2MASS and SIRTF Infrared Array Camera (IRAC) images Simulations, mission planning & pipeline testing,E/PO “Cool Cosmos”,http:/coolcosmos.ipac.caltech.edu/ Montage generates image mosaics at a single color P

7、hotoshop used to combine them into multi-color images,Montage: The Grid Years,Re-projection is slow (100 seconds for one 1024 x 512 pixels 2MASS image, single processor 1.4 GHz Linux box), so use parallelization inherent in design Grid is an abstraction - array of processors, grid of clusters, Monta

8、ge has modular design - run on any environment Prototype architecture for ordering a mosaic through a web portal Request processed on a computing grid Prototype uses the USC-ISI/Wisconsin Grid In operations will use the Distributed Terascale Facility (“The Teragrid”),Montage: The Grid Years cont,Pro

9、totype version of a methodology for running on any “grid environment” Many parts of the process can be parallelized Build a script - directed acyclical graph (DAG) - that enables parallelization Describes flow of data and processing Describes which data are needed by which part of the job Describes

10、what is to be run and when DAG is submitted to standard tools for execution,Example: Build a Mosaic of M101,2MASS 2IDR Images 1.5 degrees on a side; 100 images,M101 Mosaic: 2MASS J band,D12,D23,ax + by + c = 0,dx + ey + f = 0,a1x + b1y + c1 = 0 a2x + b2y + c2 = 0 a3x + b3y + c3 = 0,DAG for Montage,M

11、ontage on the Grid,Pegasus,Montage Workflow Specification (abstract),Grid Information Systems,Information about available resources, data location,Grid,Condor DAGMan,Maps an abstract workflow to an executable form,Executes the workflow,Summary,Version 1.7.1 released Serial processing Used or adapted by Atlasmaker, SWIRE, GLIMPSE, IPAC E/PO Developing grid architecture Prototype version exploiting parallelization in Montage design Operational version Spring 2004,