Spectrum

SWIR reflectance spectrum of the plagioclase contained in Dacite (NJ7), measured on cut slab using the SWIR-640 camera (HySpex)

Title
SWIR reflectance spectrum of the plagioclase contained in Dacite (NJ7), measured on cut slab using the SWIR-640 camera (HySpex)
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Data
Unit:  Range: Valid spectral range(s): 3999.9999999999995 - 10416.666666666664 nm
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DOI
10.26302/SSHADE/EXPERIMENT_MB_20260302_0001
Data reference
Barthez, Marie; Flahaut, Jessica (2022): Visible and near-infrared spectra of terrestrial feldspathic volcanic rocks, and of their plagioclase minerals. SSHADE/Mirabelle (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_MB_20260302_0001
Publications
Database
Experimentalists
Spectrum type
Experiment type
laboratory measurement
Type
reflectance factor
Intensity unit
no unit
Comments
Measurements done using the Micro lense. Spatial resolution = 32µm.
Instrument #1
Instrument
HySpex SWIR 640 – bidirectional reflection Near-Infrared (960-2500 nm)
Standard medium
unknown
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 960.0 - 2500.0 4.38 1.4
Comments
Measurements were made between 960nm and 2500nm.
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
45.0°
Emergence angle
0.0°
Azimuth angle
90.0°
Phase angle
45.0°
Resolution observation
1.4°
Observation mode
roi averaged
Objective type
micro
Resolutions
32.0 ${\mu}m$
Comments
The SWIR-640 camera was used to acquire the spectrum.
Name
Dacite (NJ7) cut slab
Comments
Dacite (NJ7) sample cut in the form of a sugar.
Primary material(s)
Primary constituent(s)
Experiment
Visible and near-infrared spectra of terrestrial feldspathic volcanic rocks, and of their plagioclase minerals
Date begin
2023-10-17
Release date
2026-03-26 17:03:22+0000 UTC
Version (Date)
#1 (2026-03-26 17:03:22+0000 UTC, Updated: 2026-03-26 17:03:22+0000 UTC)
History
Date Mode Version Status Comments
2026-03-10 17:36:42+0000 UTC first import #1 valid version
Analysis
The camera has been calibrated using a reference panel (50% reflectance, Pro-Lite) in the same geometry and conditions. We first handpicked image pixels containing plagioclase crystals by creating a Region Of Interest (ROI) on each cube. The average spectrum of this ROI was then used as the average spectrum of plagioclase in this rock, and when possible, as an endmember for the Spectral Angle Mapper (SAM) supervised classification.
Quality flag
5
Validator(s)