PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = GALILEO_ORBITER INSTRUMENT_NAME = "NEAR INFRARED MAPPING SPECTROMETER" INSTRUMENT_ID = NIMS OBJECT = TEXT NOTE = "Description of the BROWSE directory tree on the NIMS Cube CD-ROM set" PUBLICATION_DATE = 1998-12-10 END_OBJECT = TEXT END The 'mask' files in the BROWSE tree of this CD-ROM are digital versions of the hardcopy 'masks' generated by MIPS along with the tubes and mosaics (g-cubes). Each mask contains a summary image, half a dozen average spectra of selected areas keyed to the summary image, various histograms and annotation. (See section 5 of VOLINFO.TXT for details of mask structure.) Users should understand that NIMS masks are not intended as products for scientific analysis. They serve only as a guide to the spatial and spectral contents of the tube or mosaic. Browse the masks to discover which observations are of interest, then display and analyze the tubes and mosaics. (Just as a lower resolution image serves as a browse product for a higher resolution one, the NIMS mask serves as a browse product for a spectral image cube.) The digital masks were originally produced as 3-band RGB binary image files with 8-bit pixels, 1250 lines by 1750 samples, preceded by VICAR labels. For this CD-ROM, they have been converted to JPEG format, which may be displayed with most web browsers, or generally available programs like "xv". The CD also includes thumbnail versions of just the summary images in GIF format. Each pair of files is accompanied by a detached PDS label. The files are collected in subdirectories by target. HTML files (starting with WELCOME.HTM in the root directory) have been included linking all masks and thumbnails together, organized by target, for ease in examining the data with a web browser.