Specular and anisotropic reflectance effects on the relationship between remotely sensed data and wheat canopy chlorophyll concentration

M. E. J. Cutler, P. J. Curran

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    Abstract

    Considerable variations have been noted in the relationship between remotely sensed data and canopy chlorophyll concentration. This paper investigates two sources of variation; specular and anisotropic reflectance. Reflectance spectra and polarised reflectance spectra were collected for a wheat canopy and both the NDVI and red edge position derived. Strong correlations were observed between both measures of reflectance and canopy chlorophyll concentration, however, there was considerable variation in the strength of the relationships with change in view zenith angle. Partial correlation analysis revealed the cause of this to be significant change in the proportion of illuminated canopy viewed at each view zenith angle. A ‘minus specular’ version of the NDVI was generated but found to have little impact on its relationship with chlorophyll concentration at all view zenith angles. These results have implications for future sensor design and methodologies, as well as contributing to our understanding of radiation/canopy interactions.
    Original languageEnglish
    Pages (from-to)115-122
    JournalAspects of Applied Biology
    Volume60
    Publication statusPublished - 2000

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    reflectance
    chlorophyll
    wheat
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    zenith angle
    NDVI
    effect
    sensor
    methodology

    Cite this

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    title = "Specular and anisotropic reflectance effects on the relationship between remotely sensed data and wheat canopy chlorophyll concentration",
    abstract = "Considerable variations have been noted in the relationship between remotely sensed data and canopy chlorophyll concentration. This paper investigates two sources of variation; specular and anisotropic reflectance. Reflectance spectra and polarised reflectance spectra were collected for a wheat canopy and both the NDVI and red edge position derived. Strong correlations were observed between both measures of reflectance and canopy chlorophyll concentration, however, there was considerable variation in the strength of the relationships with change in view zenith angle. Partial correlation analysis revealed the cause of this to be significant change in the proportion of illuminated canopy viewed at each view zenith angle. A ‘minus specular’ version of the NDVI was generated but found to have little impact on its relationship with chlorophyll concentration at all view zenith angles. These results have implications for future sensor design and methodologies, as well as contributing to our understanding of radiation/canopy interactions.",
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    journal = "Aspects of Applied Biology",
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    TY - JOUR

    T1 - Specular and anisotropic reflectance effects on the relationship between remotely sensed data and wheat canopy chlorophyll concentration

    AU - Cutler, M. E. J.

    AU - Curran, P. J.

    PY - 2000

    Y1 - 2000

    N2 - Considerable variations have been noted in the relationship between remotely sensed data and canopy chlorophyll concentration. This paper investigates two sources of variation; specular and anisotropic reflectance. Reflectance spectra and polarised reflectance spectra were collected for a wheat canopy and both the NDVI and red edge position derived. Strong correlations were observed between both measures of reflectance and canopy chlorophyll concentration, however, there was considerable variation in the strength of the relationships with change in view zenith angle. Partial correlation analysis revealed the cause of this to be significant change in the proportion of illuminated canopy viewed at each view zenith angle. A ‘minus specular’ version of the NDVI was generated but found to have little impact on its relationship with chlorophyll concentration at all view zenith angles. These results have implications for future sensor design and methodologies, as well as contributing to our understanding of radiation/canopy interactions.

    AB - Considerable variations have been noted in the relationship between remotely sensed data and canopy chlorophyll concentration. This paper investigates two sources of variation; specular and anisotropic reflectance. Reflectance spectra and polarised reflectance spectra were collected for a wheat canopy and both the NDVI and red edge position derived. Strong correlations were observed between both measures of reflectance and canopy chlorophyll concentration, however, there was considerable variation in the strength of the relationships with change in view zenith angle. Partial correlation analysis revealed the cause of this to be significant change in the proportion of illuminated canopy viewed at each view zenith angle. A ‘minus specular’ version of the NDVI was generated but found to have little impact on its relationship with chlorophyll concentration at all view zenith angles. These results have implications for future sensor design and methodologies, as well as contributing to our understanding of radiation/canopy interactions.

    M3 - Article

    VL - 60

    SP - 115

    EP - 122

    JO - Aspects of Applied Biology

    JF - Aspects of Applied Biology

    SN - 0265-1491

    ER -