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IRAF Basics for Gemini

IRAF Basics for Gemini. Frank Valdes NOAO/SDM/IRAF Group. Introduction. Focus of presentation awareness rather than how-to some things apply only to ‘ cl ’ What is IRAF? large body of software for astronomical image processing and data calibrations and extraction What is Gemini IRAF?

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IRAF Basics for Gemini

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  1. IRAF Basics for Gemini Frank Valdes NOAO/SDM/IRAF Group

  2. Introduction • Focus of presentation • awareness rather than how-to • some things apply only to ‘cl’ • What is IRAF? • large body of software for astronomical image processing and data calibrations and extraction • What is Gemini IRAF? • instrument scripts layered on generic tools • you can look at the scripts (cd <package>) • Command languages • cl, ecl, ncl, xcl, pyraf IRAF Basics for Gemini

  3. Help • beginner’s guide • http://iraf.net/irafdocs/beguide.pdf • help pages • help, phelp: help alone, help <package>, help <task> • references • help dev=gui, guiapps.xhelp • http://iraf.noao.edu/scripts/irafhelp?splot • documents • http://iraf.net/irafdocs/ • support • iraf.net IRAF Basics for Gemini

  4. Getting Started • terminal windows • xterm, xgterm • create a directory to be your IRAF home • mkiraf • login.cl, loginuser.cl, uparm • image display servers • ximtool, ds9 • cl, logout IRAF Basics for Gemini

  5. Commands • packages: e.g. gemini -> gmos (packages, ?, help) • tasks • abbreviations • syntax: command vs compute, pipes • history: editing, list • foreign: escapes and declarations • !echo, !!echo, task $echo=$foreign, task $echo=$... • flpr IRAF Basics for Gemini

  6. Parameters • most tasks have parameters • required vs hidden • task auto1 auto2 param=hidden auto3 (default): • advanced: task.param.p_mode=[auto|hidden] • lpar, epar, dpar, task.par=value • parameters can be supplied as variables in the scripting environment IRAF Basics for Gemini

  7. Scripting • script guide • http://iraf.net/irafdocs/script.pdf • simple scripts • redirection: cl < mycommands.cl • declared: task $mycomands = mycommands.cl • procedure scripts IRAF Basics for Gemini

  8. Files • @files • simple images • multi-extension FITS (MEF) • masks • tables IRAF Basics for Gemini

  9. File and Image Syntax • files: [node!]name • [node!]name[.type][index][kernel][section] • templates • wildcards, lists, @files, prepend/append, replacements • important: look for “list” or plural in prompts • image sections • [c1:c2,l1:l2], [*,l1:l2], [*:2,*:2], [-*,*] • FITS kernel parameters • http://iraf.net/irafdocs/fits_userguide.pdf • MEF extensions IRAF Basics for Gemini

  10. Graphics • plot package: graph, sgraph, implot, gkimosaic • igi: ftp://ftp.stsci.edu/pub/software/stsdas/docs/IgiManual.pdf • cursor • advance: =gcur, rgcur • cursor commands • important: ?, :, = (:.snap) • advanced: annotation, saving (gif, metacode) • cursor and graphics redirection • gcur=<file>, >G • glbcolor IRAF Basics for Gemini

  11. Image Display • display servers: ximtool, ds9 • display, mscdisplay, … • image cursor • =imcur • rimcur IRAF Basics for Gemini

  12. Accelerators • history editing • up arrow, e, ^^ • epar editing • ^U^L, :go • file templates • image templates • need to escape [: imhead *V![12].fits • replacement syntax • imcopy *V1.fits *V%1%2%.fits IRAF Basics for Gemini

  13. Loops list = “file” while (fscan(list,s1) != EOF) { for (i=1; i<=10; i+=1) { printf (“%s[%d]\n”, s1, i) | scan (s2) sometask (s2) } } list = “” IRAF Basics for Gemini

  14. Common Tasks • copy, rename, delete • imcopy, imrename, imdelete • imhead, nhedit, hedit, hselect • imarith, imexpr, imcombine • display, imexam • fields, join, files, sections • gemini IRAF Basics for Gemini

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