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Mitigating Spectral Errors from White Reference Degradation in Soil Spectroscopy.

Simon Ian Futerman1, Rachel Lugassi1, Jonti Evan Shepherd2

  • 1Remote Sensing Laboratory, Porter School of the Environment and Earth Sciences, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 699780, Israel.

Applied Spectroscopy
|November 3, 2025
PubMed
Summary
This summary is machine-generated.

Internal soil standards (ISS) effectively correct spectral data inconsistencies caused by white reference (WR) panel contamination in soil reflectance spectroscopy. This improves data reliability within laboratories and supports harmonization efforts.

Keywords:
ISSSoil spectroscopyWRdata harmonizationinternal soil standardsystematic errorswhite reference

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Area of Science:

  • Soil science
  • Spectroscopy
  • Analytical chemistry

Background:

  • Soil reflectance spectroscopy enables rapid, non-destructive soil property assessment.
  • Contamination or deterioration of white reference (WR) panels causes spectral discrepancies, hindering data harmonization.

Purpose of the Study:

  • To investigate the impact of WR panel contamination on soil spectral measurements.
  • To evaluate the effectiveness of an internal soil standard (ISS) for correcting spectral discrepancies.

Main Methods:

  • Soil samples were measured using a contact-probe setup calibrated with both clean and contaminated WR panels.
  • An internal soil standard (ISS) was used to correct spectral data following IEEE P4005 protocols.
  • Spectral inconsistencies were quantified using the modified average spectral difference stability (mASDS) measure.

Main Results:

  • ISS correction significantly reduced spectral inconsistencies, particularly in the visible (Vis) region.
  • ISS effectively harmonized spectra acquired under different WR conditions, lowering mASDS.
  • The method enhanced intra-laboratory consistency under routine operational variability.

Conclusions:

  • Internal soil standards are critical for correcting spectral data affected by WR panel contamination.
  • Routine use of ISS alongside WR calibration enhances the reliability of soil spectral datasets.
  • Implementing ISS measurements with WR calibration supports long-term harmonization of soil spectral libraries.