RELAB Spectral Library Ralph Milliken, Brown University This bundle contains the following collections: data_reflectance - Reflectance spectra of laboratory samples (specimens) acquired using equipment at the Brown University Reflectance Experiment Laboratory (RELAB). data_ancillary_chemistry - Chemical analyses of specimens measured. Not every specimen measured has chemical analysis data. data_ancillary_image - Photographs of the specimens measured. Not every specimen measured has a photograph. Some have more than one photograph. document_collection - The Spectral Library User's Guide and other documents context_collection - PDS4 Context Products that identify the RELAB investigation and instruments. schema_collection - The Spectral Library Data Dictionary schema and Schematron files, along with the Spectral Library Dictionary User's Guide. Each document and data product in this bundle is described by a PDS4 label in a separate file with the same name but with the extension XML. PDS4 labels are XML (eXtended Markup Language) files that conform to the PDS4 Information Model XML schema at https://pds.nasa.gov/pds4/schema/released/. They are best viewed in an XML-aware text editor, and may be used by software that can manipulate XML documents. The PDS Geosciences Node Spectral Library () is a web interface to the products in the RELAB spectral library. This tool may be used to search for and display spectra of interest. See these sources for more information. - For information about the RELAB facility, see http://www.planetary.brown.edu/relab/. - For information about PDS4, see https://pds.nasa.gov/pds4/about/. This bundle was created by Ralph Milliken, Dan Scholes, and Susan Slavney, and is archived at the Geosciences Node of the Planetary Data System. Questions about this bundle may be directed to geosci@wunder.wustl.edu.