Filter selection for NIR sensing of plant and soil materials

S. A. Shearer, J. A. Thomasson, S. G. McNeill

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A method of selecting optical filters for use in near infrared sensors is presented. This method considers the collective effects of illumination source, reflectance characteristics of the surface or surfaces in question, possible filter types and transmittance characteristics, and detector sensitivity. Reflectance ratios were generated for two or more detector/filter combinations and discriminant analysis was applied to select the most meaningful complement of hardware. For illustration purposes this approach was applied to an example situation in which it was desired to discriminate between 'green plant matter' and 'other' materials. The 'other' category was comprised of soil and crop residue. A classification accuracy of 100% was possible with one reflectance ratio generated from one detector type and two filters.

Original languageEnglish
Pages (from-to)1209-1214
Number of pages6
JournalTransactions of the ASABE
Issue number3
StatePublished - 1996


  • Near infrared sensor
  • Optical filter
  • Plant canopies

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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