lect18 - UCF Physics: AST 5765/4762: (Advanced)...

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UCF Physics: AST 5765/4762: (Advanced) Astronomical Data Analysis Fall 2009 Lecture Notes: 18. FITS, ND Gaussian 1 Check In: 12:30 — 12:35, 5 min Questions before we start? 2 Quiz 2: 12:35 — 12:55, 20 min 3 FITS Implementation: 12:55 — 13:05, 10 min FITS = Flexible Image Transport System, a data file format Developed in 1970s, among oldest data formats FITS header is set of 80-column “cards” (throwback!) Data in IEEE binary format Can also do ASCII tables, repeated header/data units, etc. FITS mainly used for images with 1 HDU = header-data unit = 1 header + 1 dataset Header documents origin of image, what has been done to it FAST: less SPITZER_I4_15891712_0692_0000_4_bcd.fits Point out keyword, value, comment, HISTORY, END, NAXIS array Related items can be in 1D array, show NAXIS * Analysis may compute many auxiliary values per image If distributing (“transporting”) data to others Can store auxiliary values in header to inform recipient of. ..anything
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This note was uploaded on 11/09/2009 for the course AST 4762 taught by Professor Harrington during the Fall '09 term at University of Central Florida.

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lect18 - UCF Physics: AST 5765/4762: (Advanced)...

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