Parse SPECPR spectral data files

Parse and resample spectral reflectance data

Harmonizing spectral libraries across USGS, ASTER, EMIT, and ECOSTRESS for machine learning or geophysics

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Understanding of fixed SPECPR 1536-byte record format and USGS column conventions; wavelength units must match

• · Interpolating across NaN gaps (spectral data has voids)
• · Confusing wavelength units (µm vs nm) across sources
• · Treating delete value -1.23e+34 as valid data
• · Forgetting separate wavelength file in USGS format

• · Explicit IEEE 754 single-precision format for SPECPR
• · Cubic-spline interpolation method documented (0.0001 µm fine spacing)
• · Unit conversion table for each source (USGS, ASTER, EMIT, ECOSTRESS)
• · Gaussian convolution with FWHM (standard spectral resampling)
• · Clark 1993 reference for SPECtrum Processing