18 november 2004astrogrid solar movie maker votechkick-off votech kick-off meeting astrogrid solar...

18 November 2004 AstroGrid Solar Movie Maker VOTechKick-off

VOTech Kick-off Meeting

AstroGrid Solar Movie MakerDeploying SolarSoft IDL tools with CEA

Elizabeth Auden & Silvia Dalla

18 November 2004 (Animated GIF of solar movie)


AstroGrid Solar Movie Maker

• Accessing TRACE data and SolarSoft data reduction

• Generating solar MPEGs

• Deploying IDL as a CEA grid tool

• Example: Creating a solar movie with AstroGrid


TRACE Data

TRACE files are presented to the movie maker tool as a series of URLs inside a VOTable. CEA downloads the URLs as temporary files local to the movie maker tool.


SolarSoft TRACE Analysis


MPEG Generation

One MPEG per hourly TRACE file is generated with IDL:

1. Mpeg_open

2. Mpeg_put

3. Mpeg_save

4. Mpeg_close

MPEG generation is tightly controlled (by Elizabeth!), so rate, image size, and encoding type are known to be identical.

MPEGs from multiple hourly TRACE files are put together using simple Unix concatenation facility.


CallMakeMPEGFitsImages tool

So, what’s under the hood?

1. Input: output filename, name(s) of 1 or more hourly TRACE files

2. Confirm that all input files are valid hourly TRACE files

3. Loop through TRACE files:

a. Reduce data with SolarSoft TRACE tools

b. Generate MPEG with IDL MPEG encoding

4. Concatenate all hourly MPEGs into one movie

5. Output: one MPEG solar movie written to MySpace


CEA Interface: Unix shell script IDL – what we didn’t use:

• Ion / IonScript - required extra licensing

• RPCs - vetoed by MSSL system administrator

• IDL VM - code restrictions, obnoxious splash screen

• Interactive routines – no dialog boxes or other GUIs

MPEG generation is tightly controlled (by Elizabeth!), so rate, image size, and encoding type are known to be identical.

MPEGs from multiple hourly TRACE files are put together using simple Unix concatenation facility.

Solution: shell script to generate IDL SolarSoft session, execute IDL data reduction and MPEG encoding, and concatenate MPEGs.


Configuration of Tool with CEA Deploy local installation of CEA with maven

Configure a $work.dir directory containing tool files

Fill in AstroGrid CEA registry template:• Provide tool name and other curation information

• Declare AstroGrid AuthorityID

• Locate MySpace (remote or local)

• Specify input(s) and output(s) – data / file type, number, syntax, etc

Use maven to finish setup, configuration, and AstroGrid update

If all goes according to plan, tool name appears in AstroGrid portal workflow dropdown menu.


Example: TRACE data search

(screen shot of AG portal TRACE data search)


Example: Solar Movie Workflow

(screen shot of AG portal movie maker workflow)


Example: Movie Maker result

(screen shot of AG portal showing movie in MySpace explorer; play movie)


Future Work

Movie Maker tool enhancement:• Accommodate data from TRACE, SOHO-CDS, SOHO-EIT, Yohkoh, etc.

• Include derotation algorithm to account for Sun’s rotation during movie

• Allow overlay of 2 or more images displaying different wavelengths / magnetic observation in each frame.

• Use coordinate and pointing information to ensure spatial alignment of images

Development of further tools:• Collaboration between Silvia (IDL code) and Elizabeth (CEA configuration) on new

solar AstroGrid tools

• Possible new tools: a simple movie maker, data reduction tool, multiple wavelength / magnetic / white light overlay image tool

18 november 2004astrogrid solar movie maker votechkick-off votech kick-off meeting astrogrid solar...

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