Reflectance spectroscopy datasets for the validation of TANAGER

The Three-Axis N-sample Automated Goniometer for Evaluating Reflectance (TANAGER) is a custom goniometer designed to rapidly acquire spectra of natural rock surfaces across the full scattering hemisphere. TANAGER interfaces with a Malvern Panalytical ASD Fieldspec 4 Hi-Res reflectance spectrometer to collect data from 350-2500 nm at a range of incidence, emission and azimuth angles. To validate the accuracy and repeatability of data collected with TANAGER - and to characterize any instrument noise, artifacts or sample heating effects - we collected spectra from three categories of targets: (1) powdered calcium sulfate (anhydrite), (2) naturally weathered basalt surfaces, and (3) color calibration targets. Here, we share repeated spectra of anhydrite over two 30 minute heating tests to characterize spectral changes due to loss of adsorbed water. We also share spectra of the color standards and basalts from repeated data collection runs with incidence and emission angles ranging from -70 to +70 degrees, for both in-plane and out-of-plane geometries.