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: The resulting multi-extension FITS files are compressed using the FPACK utility and the lossless Rice compression algorithm . 3. Usage and Accessibility
: The APZIP code is part of the apogeereduce software product. While primarily an internal tool for the Sloan Digital Sky Survey (SDSS) , versions of the pipeline are hosted in public repositories like the SDSS-III SVN repository. 4. Comparative Efficiency
The theoretical maximum compression for APOGEE's noise levels and bit depth is approximately 2.6. In practice, APZIP’s compression of ~2.0 is considered as good as can be expected for the specific astrophysical data it handles.
: An average difference image is computed and subtracted from all difference images, resulting in "residual" images that are easier to compress.
: Detector reads are converted into difference images (the first read plus difference images) to reduce dynamic range.
: The corresponding program APUNZIP.PRO is used to restore the raw data cubes for reduction.
: The resulting multi-extension FITS files are compressed using the FPACK utility and the lossless Rice compression algorithm . 3. Usage and Accessibility
: The APZIP code is part of the apogeereduce software product. While primarily an internal tool for the Sloan Digital Sky Survey (SDSS) , versions of the pipeline are hosted in public repositories like the SDSS-III SVN repository. 4. Comparative Efficiency : The resulting multi-extension FITS files are compressed
The theoretical maximum compression for APOGEE's noise levels and bit depth is approximately 2.6. In practice, APZIP’s compression of ~2.0 is considered as good as can be expected for the specific astrophysical data it handles. While primarily an internal tool for the Sloan
: An average difference image is computed and subtracted from all difference images, resulting in "residual" images that are easier to compress. In practice, APZIP’s compression of ~2
: Detector reads are converted into difference images (the first read plus difference images) to reduce dynamic range.
: The corresponding program APUNZIP.PRO is used to restore the raw data cubes for reduction.