urn:nasa:pds:context:facility:laboratory.relab 1.1 1.22.0.0 Product_Context NASA/Keck Reflectance Experiment Laboratory (RELAB), Brown University, Providence, Rhode Island, United States NASA/Keck Reflectance Experiment Laboratory (RELAB) 2025-01-07 1.1 Updated schema version. Adding missing "investigation" references. 2020-04-09 1.0 Post-peer-review version. urn:nasa:pds:context:investigation:individual.carbonate_refractive_indices facility_to_investigation urn:nasa:pds:context:investigation:other_investigation.relab_speclib facility_to_investigation urn:nasa:pds:context:instrument:relab.bd-vnir facility_to_instrument urn:nasa:pds:context:instrument:relab.bc-ftir1 facility_to_instrument urn:nasa:pds:context:instrument:relab.bcf-ftir2 facility_to_instrument NASA/Keck Reflectance Experiment Laboratory Laboratory The Keck/NASA Reflectance Experiment Laboratory (RELAB) is a multi-user spectroscopy facility supported by NASA. RELAB has two operational spectrometers available to NASA scientists: 1) a near-ultraviolet, visible, and near-infrared bidirectional spectrometer and 2) a near- and mid- infrared FT-IR spectrometer. The overall purpose of the design and operation of the RELAB bidirectional spectrometer is to obtain high precision, high spectral resolution, bidirectional reflectance spectra of earth and planetary materials. Spectroscopic data acquired in the laboratory provide the interpretive foundation upon which compositional information about unexplored or unsampled planetary surfaces is derived from remotely obtained reflectance spectra. One of the key elements of the design of RELAB is the ability to measure samples using viewing geometries specified by the user. This allows investigators to simulate the geometry of natural observing conditions for particulate samples as small as 50 mg. Laboratory time can be made available at no charge to investigators who are in funded NASA programs. For more information, see https://sites.brown.edu/relab/.